FM600 Manual - Crown Broadcast

Transcription

FM600 Broadcast Transmitter
User's Manual
©2008 Crown Broadcast, a division of
International Radio & Electronics Corporation
25166 Leer Drive, Elkhart, Indiana, 46514-5425 U.S.A. (574) 262-8900
Revision Control
Revision
Print Date
Initial Release
March 2007
Revision A
January 2008
Important Notices
©2008, Crown Broadcast, a division of International Radio & Electronics Corporation.
Portions of this document were originally copyrighted by Michael P. Axman in 1994.
All rights reserved. No part of this publication may be reproduced, transmitted, transcribed,
stored in a retrieval system, or translated into any language in any form by any means without
the written permission of International Radio & Electronics Corporation.
Printed in U.S.A.
Crown Broadcast attempts to provide information that is accurate, complete, and useful.
Should you find inadequacies in the text, please send your comments to the following address:
25166 Leer Drive
Elkhart, Indiana, 46514-5425 U.S.A.
ii
Contents
Section 1– Getting Acquainted
1-1
1.1
1.2
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.3
1.4
1.5
1.5.1
1.5.2
1.5.3
1-2
1-3
1-4
1-4
1-4
1-5
1-6
1-7
1-9
1-9
1-9
1-9
1-9
Your Transmitter
Applications and Options
Stand Alone
Backup
Exciter
Translator
Satellator
Transmitter/Exciter Specifications
Receiver Specifications
Safety Considerations
Dangers
Warnings
Cautions
Section 2– Installation
2-1
2.1
2.2
2.2.1
2.2.2
2.3
2.3.1
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.11
2.12
2-2
2-2
2-2
2-3
2-4
2-6
2-7
2-11
2-12
2-13
2-13
2-14
2-14
2-15
2-15
Operating Environment
Power Connections
AC Line Voltage Setting
Fuses
Frequency (Channel) Selection
Modulation Compensator
Receiver Frequency Selection
RF Connections
Audio Input Connections
SCA Input Connections
Composite Input Connection
Audio Monitor Connections
Pre-emphasis Selection
Program Input Fault Time-out
Remote I/O Connector
iii
Section 3-Operation
3-1
3.1
3.2
3.2.1
3.2.2
3.3
3.3.1
3.3.2
3.3.3
3.4
3.5
3.6
3.7
3.8
3.9
Initial Power-up Procedures
Power Switches
Power Switch
Carrier Switch
Front Panel Bar-Dot Displays
Audio Processor Input
Highband and Wideband Display
Modulation Display
Input Gain Switches
Processing Control
Stereo-Mono Switch
RF Output Control
Digital Multimeter
Fault Indicators
3-2
3-4
3-4
3-4
3-5
3-5
3-5
3-5
3-6
3-6
3-6
3-7
3-7
3-8
Section 4-Principals of Operation
4-1
4.1
4.2
4.2.1
4.2.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4-2
4-3
4-3
4-4
4-6
4-7
4-8
4-10
4-11
4-13
4.14
4-15
4-15
4-16
iv
Part Numbering
Audio Processor/Stereo Generator Circuit Board
Audio Processor Section
Stereo Generator Section
RF Exciter Circuit
Metering Circuit
Motherboard
Display Circuit Board
Driver Switch logic Board
RF Driver
RF Amplifier
Chassis
RF Output Filter & Reflectometer
Receiver Circuit Board Option
Section 5-Adjustments and Tests
5-1
5.1
5.1.1
5.1.2
5.2
5.2.1
5.2.2
5-2
5-2
5-2
5-2
5-2
5-3
5-3
5-3
5-3
5-3
5-3
5-4
5-4
5-4
5-4
5-4
5-4
5-5
5-5
5-5
5-5
5-6
5-6
5-7
5-7
5-7
5-8
5-8
5-8
5-8
5-8
5-9
5-9
5-9
5-9
5-9
5-9
5-9
5-10
5-10
Audio Processor Adjustments
Pre-Emphasis Selection
Pre-Emphasis Adjustment
Stereo Generator Adjustments
Separation
Composite Output
Using a Modulation Monitor
5.2.3 19kHz Level
5.2.4 19kHz Phase
5.3
Frequency Synthesizer Adjustments
5.3.1 Frequency (Channel) Selection
5.3.2 Modulation Compensator
5.3.3 Frequency Measurement and Adjustment
5.3.4 FSK Frequency Offset Control
5.4
Metering Board Adjustments
5.4.1 Power Calibrate
5.4.2 Power Set
5.4.3 SWR Calibrate
5.4.4 PA Current Limit
5.5
Motherboard Configuration
5.6
Display Modulation Calibration
5.7
Driver Switch Logic Adjustment
5.8
Bias Set (RF Power Amplifier)
5.9
Performance Verification
5.9.1 Audio Proof of Performance Measurements
5.9.2 De-Emphasis Input Network
5.10 Carrier Frequency
5.11 Output Power
5.12 RF Bandwidth and RF Harmonics
5.13 Pilot Frequency
5.14 Audio Frequency Response
5.15 Audio Distortion
5.16 Modulation Percentage
5.17 FM and AM Noise
5.18 Stereo Separation
5.19 Crosstalk
5.19.1 Main Channel Into Sub
5.19.2 Sub Channel Into Main
5.20 38kHz Subcarrier Suppression
5.21 Additional Checks
v
Section 6-Reference Drawings
6-1
6.1
6.2
Views
Board Layouts and Schematics
6-2
6-4
Section 7-Service and Support
7-1
7.1
7.2
7-2
7-2
Service
24-Hour Support
Transmitter Output Efficiency
Glossary
Index
vi
Appendix-1
G-1
Index-1
Section 1—Getting Acquainted
This section provides a general description of the FM600 transmitter and
introduces you to safety conventions used within this document. Review
this material before installing or operating the transmitter.
Getting Acquainted
1-1
1.1 Your Transmitter
The FM600 is a member of a family of FM stereo broadcast transmitters. Crown transmitters
are known for their integration, ease-of-use, and reliability.
The integration is most apparent in the standard transmitter configuration which incorporates
audio processing, stereo generation, and RF amplification without compromised signal quality.
A single Crown transmitter can replace several pieces of equipment in a traditional system.
Ease-of-use is apparent in the user-friendly front panel interface and in the installation
procedure. Simply select your operating frequency (using 5 external switches), add an audio
source, attach an antenna, and connect AC power and you're ready to broadcast. Of course,
the FM series of transmitters also feature more sophisticated inputs and monitoring
connections if needed.
Reliability is a Crown tradition. The first Crown transmitters were designed for rigors of
worldwide and potentially portable use. The modular design, quality components, engineering
approach, and high production standards ensure stable performance.
Remote control and metering of the transmitter are made possible through a built-in I/O connector. For more direct monitoring, the front panel includes a digital multimeter display and
status indicators. Automatic control circuitry provides protection for high VSWR as well as high
current, voltage, and temperature conditions.
Illustration 1-1 FM600 Stereo Broadcast Transmitter
1-2
FM600 Manual
1.2 Applications and Options
Crown transmitters are designed for versatility in applications. They have been used as
stand-alone and backup transmitters and in booster, translator, satellator, and nearcast
applications. The following discussion describes these applications further.
Model numbers describe the configuration of the product (which has to do with its intended
purpose) and the RF output power which you can expect.
The number portion of each name represents the maximum RF output power. The FM600,
for example, can generate up to 600 watts of RF output power.
Suffix letters describe the configuration. The FM600T, for example, is the standard or
transmitter configuration. Except where specified, this document describes the transmitter
configuration. In this configuration, the product includes the following components
(functions):
•
•
•
•
Audio Processor/Stereo Generator
RF Exciter
Metering
Low-Pass filter
Audio
Processor
Circuit
Stereo
Generator
Circuit
RF Exciter Circuit
RF Low Pass filter
Metering
Circuit
Illustration 1–2 Standard (Transmitter) Configuration
Getting Acquainted
1-3
1.2.1 Stand-Alone
In the standard configuration, the FM600 is an ideal stand-alone transmitter. When you add
an audio source (monaural, L/R stereo, or composite signal), an antenna, and AC power,
the transmitter becomes a complete FM stereo broadcast station, capable of serving a
community.
As stand-alone transmitters, Crown units often replace multiple pieces of equipment in a
traditional setup (exciter, audio processor, RF amplifier).
1.2.2 Backup
In the standard configuration, Crown transmitters are also used in backup applications.
Should your primary transmitter become disabled, you can continue to broadcast while
repairs take place. In addition, the FM transmitters can replace disabled portions of your
existing system including the exciter, audio processor, or amplifier. Transfer switches on
each side of the existing and backup transmitters make the change-over possible with
minimal downtime.
1.2.3 Exciter
In addition to the standard configuration, the FM600 is available in optional configurations to
meet a variety of needs.
An "E" suffix, as in the FM600E, for example, represents an exciter-only configuration. In
this configuration, the audio processor and stereo generator boards are replaced with circuitry to bypass their function. The exciter configurations are the least expensive way to get
Crown quality components into your transmission system.
You might consider the Crown exciter when other portions of your system are performing
satisfactorily and you want to maximize your investment in present equipment.
1-4
FM600 Users Manual
1.2.4 Translator
A receiver configuration (FM600R, for example) replaces the audio processor/stereo generator
board with a receiver module. This added feature makes the FM600 ideal for translator service
in terrestrial-fed networks. These networks represent a popular and effective way to increase
your broadcasting coverage. Translators, acting as repeater emitters, are necessary links in
this chain of events.
Traditionally, network engineers have relied on multiple steps and multiple pieces of equipment
to accomplish the task. Others have integrated the translator function (receiver and exciter) to
feed an amplifier. Crown, on the other hand, starts with an integrated transmitter and adds a
solid-state Receiver Module to form the ideal translator.
RF Input
(Receive Antenna)
Receiver
Module
(Option)
RF Output
RF Low
Pass Filter
Frequency
Selection
(Receive)
Frequency
Selection
Transmit
Illustration 1–3 Crown's Integrated Translator
This option enables RF input and RF output on any of Crown’s FM series of transmitters. In
addition, the module supplies a composite output to the RF exciter portion of the transmitter.
From here, the signal is brought to full power by the built-in power amplifier for retransmission.
The Receiver Module has been specifically designed to handle SCA channel output up to 100
kHz for audio and high-speed data.
FSK ID programming is built-in to ensure compliance with FCC regulations regarding the on-air
identification of translators. Simply specify the call sign of the repeater station when ordering.
Should you need to change the location of the translator, replacement FSK chips are available.
The Receiver Module option should be ordered at the time of initial transmitter purchase. However, an option kit is available for field converting existing Crown units.
In the translator configuration there are differences in the function of the front panel. See Section 3 for a description.
Getting Acquainted
1-5
1.2.5 Satellator
One additional option is available for all configurations—an FSK Identifier (FSK IDer). This
added feature enables the FM600 to transmit its call sign or operating frequency in a Morse
code style. This option is intended for use in satellite-fed networks. Transmitters equipped in
this fashion are often known as "satellators."
Connect the transmitter to your satellite receiver and the pre-programmed FSK IDer does the
rest—shifting the frequency to comply with FCC requirements and in a manner that is unnoticeable to the listener. The FSK IDer module should be ordered at the time you order your
transmitter, but is available separately (factory programmed for your installation).
FSK Ider
Illustration 1–4 Transmitter with FSK IDer Option
Add the FSK IDer option to the exciter configuration for the most economical satellator. (A
composite input signal is required.)
1-6
FM600 User’s Manual
1.3 Transmitter/Exciter Specifications
Frequency Range
87.9 MHz–107.9 MHz (76 MHz–90 MHz
optionally available)
RF Power Output
(VSWR 1.7:1 or better)
FM600
Up to 660 watts output
RF Output Impedance
50 Ohms
Frequency Stability
Meets FCC specifications from 0-50
degrees C
Audio Input Impedance
50k Ω bridging, balanced, or 600 Ω
Audio Input Level
Selectable for –10 dBm to +10 dBm for
75 kHz deviation at 400 Hz
Pre-emphasis
Selectable for 25, 50, or 75 µsec; or flat
Audio Response
Conforms to 75 µsec pre-emphasis
curve as follows:
Complete Transmitter
±0.30 dB (50 Hz–10 kHz)
±1.0 dB (10 kHz–15 kHz)
Exciter only
±0.25 dB (50 Hz–15 kHz)
Distortion (THD + Noise)
Less than 0.7% (at 15kHz)
Exciter only
Less than 0.3% (50Hz-15kHz)
Stereo Separation
Better than –40dB (50Hz-15kHz)
Exciter only
Better than –40dB (50Hz-15kHz)
Crosstalk
Main into Sub, better than –40dB
Sub into Main, better than –40dB
Stereo Pilot
19 kHz ±2 Hz, 9% modulation
Getting Acquainted
1-7
Subcarrier Suppression
50dB below ±75 kHz deviation
FM S/N Ratio (FM noise)
Better than –60dB
Exciter only
Better than –70dB
AM S/N Ratio
Asynchronous and synchronous noise
better than FCC requirements
RF Bandwidth
±120 kHz, better than –35 dB
±240 kHz, better than –45 dB
RF Spurious Products
Better than –71dB
Operating Environment
Temperature (0°C to 50°C)
Humidity (0 to 80% at 20°C)
Maximum Altitude (3,000 Meters;
9834 Feet
AC Power
120-240 volts* +/-10% 50/60Hz
Note: We set voltage and ampere requirements to assist you in designing your system. Depending on your operating frequency, actual requirements for maximum voltage and current
readings are 10–15% lower than stated.
Regulatory
Type notified FCC parts 73 and 74
Meets FCC, DOC
Dimensions
32.38 x 59.69 x 62.23 centimeters
12.75 x 23.5 x 24.5 Inches
Weight
38 lbs
17.237 Kg
*200 volts AC input or greater, recommended for RF power output of 575W or greater. Voltage measured at the AC power input
connector to transmitter.
1-8
1.4 Receiver Specifications
Monaural Sensitivity (demodulated, de-emphasized)
3.5 µ V for signal-to-noise > 50 dB
Stereo Sensitivity (19–kHz pilot frequency added)
31 µ V for signal-to-noise > 50 dB
Connector
Standard type N-Female, 50 Ω
Shipping Weight
1 lb
1.5 Safety Considerations
Crown Broadcast assumes the responsibility for providing you with a safe product and safety
guidelines during its use. “Safety” means protection to all individuals who install, operate, and
service the transmitter as well as protection of the transmitter itself. To promote safety, we use
standard hazard alert labeling on the product and in this manual. Follow the associated
guidelines to avoid potential hazard.
1.5.1 Dangers
DANGER represents the most severe hazard alert. Extreme bodily harm or death will occur if
DANGER guidelines are not followed.
1.5.2 Warnings
WARNING represents hazards which could result in severe injury or death.
1.5.3 Cautions
CAUTION indicates potential personal injury, or equipment or property damage if the associated guidelines are not followed. Particular cautions in this text also indicate unauthorized radio-frequency operation.
Illustration 1–5 Sample Hazard Alert
Getting Acquainted
1-9
Notes
1-10
Section 2—Installation
This section provides important guidelines for installing your transmitter.
Review this information carefully for proper installation.
Installation
2-1
2.1 Operating Environment
You can install the FM transmitter in a standard component rack or on a suitable surface
such as a bench or desk. In any case, the area should be as clean and well ventilated as
possible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you
set the transmitter on a flat surface, install spacers on the bottom cover plate. If you install
the transmitter in a rack, provide adequate clearance above and below. Do not locate the
transmitter directly above a hot piece of equipment.
2.2 Power Connections
The FM600 can operate on any voltage between 120 and 240 volts AC (50 or 60 Hz; single
phase).
2.2.1 AC Line Voltage Setting
Voltage selection is automatic; configuration is not necessary.
AC Input Power
Connection
Illustration 2–2 AC Input Power Connection
2-2
2.2.2 Fuses
The fuse holder is located on the back panel just above the power connection.
Illustration 2–3 Fuse Holder
For 120 to 200 VAC operation, use the fuse installed at the factory. For 200 to 240 VAC operation, use the slow-blow fuse located in a hardware kit within the transmitter packaging. Consult
the following table:
AC Input Voltage
Fuse Rating
120-200 VAC
12 Ampere
200-240 VAC
6 Ampere
Illustration 2–4 Fuse Reference Table
Installation
2-3
2.3 Frequency (Channel) Selection
Your transmitter is capable of operating between 87.9 and 107.9 MHz in the FM band. The
transmitter can also operate between 76 and 90 MHz by shorting pins 9 and 10 of J20 on the
motherboard. See Illustration 2-6.
To adjust the operating frequency, follow these steps:
1. Locate the frequency selector switches on the front panel which will be used to change the
setting. See Illustrations 2–6 and 2–7.
2. Use small flat blade screwdriver or another suitable device to rotate the switches to the desired setting. (The selected number will appear directly above the white indicator dot on
each switch.) See examples of selected frequencies in the illustration below.
3. To change the operating band from 87.9-107.9MHz to 76-90MHz or vice versa, or to adjust
the modulation compensation pot, remove the top cover to gain access to these features.
See Illustrations 2-6 and 2-10.
J20
Frequency Selector Switches
Illustration 2–6 Top Cover Removed
2-4
2.3 Frequency (Channel) Selection, continued
Megahertz
.1
.01
Illustration 2–7 Transmitter Front Panel (Frequency Selector Switches)
= 88.10 MHz
= 107.90 MHz
Illustration 2–8 Two Sample Frequency Selections
Installation
2-5
The Modulation trim-potentiometer (see Illustration 2–10) compensates for slight variations in
deviation sensitivity with frequency. Set the trim-pot dial according to the following graph:
Frequency of Operation (MHz)
Modulation Compensation Pot Setting
108
0
106
10
104
15
102
25
100
35
98
40
97.1
45
96
55
94
60
92
70
90
75
88
80
86
80
84
80
82.4
70
82
65
80
55
78
30
76
0
Illustration 2–9 Modulation Compensator Settings
These compensator settings are approximate. Each mark on the potentiometer represents
about 1.8% modulation compensation.
Modulation
Compensator
Pot
Illustration 2–10 Modulation Compensator Pot
2-6
2.4 Receiver Frequency Selection
If you have a transmitter equipped with the receiver option, you will need to set the receiving or
incoming frequency.
1. With the top cover removed, locate the receiver module and the two switches (labeled SW1
and SW2).
J1
Frequency
Switches
Receiver
Module
J2
Illustration 2–11 Receiver Module Switches
2. Use the adjacent chart to set the switches for the desired incoming frequency.
3. For frequencies in the Japan FM band, short pins 7&8 on J1 on the receiver card.
4. For 75us pre-emphasis short pins 3&4 and 5&6 on J2 of the Receiver card.
5. For 50us pre-emphasis short pins 1&2 and 7&8 on J2 of the Receiver card.
6. After setting the frequency, replace the top cover and screws.
Installation
2-7
Freq. 74-90 Freq. 88-108
MHz
MHz
74.9
87.9
75.0
88.0
75.1
88.1
75.2
88.2
75.3
88.3
75.4
88.4
75.5
88.5
75.6
88.6
75.7
88.7
75.8
88.8
75.9
88.9
76.0
89.0
76.1
89.1
76.2
89.2
76.3
89.3
76.4
89.4
76.5
89.5
76.6
89.6
76.7
89.7
76.8
89.8
76.9
89.9
77.0
90.0
77.1
90.1
77.2
90.2
77.3
90.3
77.4
90.4
77.5
90.5
77.6
90.6
77.7
90.7
77.8
90.8
77.9
90.9
78.0
91.0
78.1
91.1
78.2
91.2
78.3
91.3
78.4
91.4
78.5
91.5
78.6
91.6
78.7
91.7
78.8
91.8
SW1
SW2
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
1
9
1
9
1
9
1
9
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
A
A
B
B
C
C
D
D
E
E
F
F
0
0
1
1
2
2
3
3
Freq. 74-90 Freq. 88-108
MHz
MHz
78.9
91.9
79.0
92.0
79.1
92.1
79.2
92.2
79.3
92.3
79.4
92.4
79.5
92.5
79.6
92.6
79.7
92.7
79.8
92.8
79.9
92.9
80.0
93.0
80.1
93.1
80.2
93.2
80.3
93.3
80.4
93.4
80.5
93.5
80.6
93.6
80.7
93.7
80.8
93.8
80.9
93.9
81.0
94.0
81.1
94.1
81.2
94.2
81.3
94.3
81.4
94.4
81.5
94.5
81.6
94.6
81.7
94.7
81.8
94.8
81.9
94.9
82.0
95.0
82.1
95.1
82.2
95.2
82.3
95.3
82.4
95.4
82.5
95.5
82.6
95.6
82.7
95.7
82.8
95.8
SW1
SW2
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
2
A
2
A
2
A
2
A
2
A
2
A
2
A
2
A
4
4
5
5
6
6
7
7
8
8
9
9
A
A
B
B
C
C
D
D
E
E
F
F
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
Illustration 2–12-1 Receiver Frequency Selection
(Continued on next page)
2-8
Freq. 74-90 Freq. 88-108
MHz
MHz
82.9
95.9
83.0
96.0
83.1
96.1
83.2
96.2
83.3
96.3
83.4
96.4
83.5
96.5
83.6
96.6
83.7
96.7
83.8
96.8
83.9
96.9
84.0
97.0
84.1
97.1
84.2
97.2
84.3
97.3
84.4
97.4
84.5
97.5
84.6
97.6
84.7
97.7
84.8
84.9
85.0
85.1
85.2
85.3
85.4
85.5
85.6
85.7
85.8
85.9
86.0
86.1
86.2
86.3
86.4
86.5
97.8
97.9
98.0
98.1
98.2
98.3
98.4
98.5
98.6
98.7
98.8
98.9
99.0
99.1
99.2
99.3
99.4
99.5
SW1
SW2
2
A
2
A
2
A
2
A
2
A
2
A
2
A
2
A
3
B
3
8
8
9
9
A
A
B
B
C
C
D
D
E
E
F
F
0
0
1
B
3
B
3
B
3
B
3
B
3
B
3
B
3
B
3
B
3
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
A
Freq. 74-90 Freq. 88-108
MHz
MHz
86.6
99.6
86.7
99.7
86.8
99.8
86.9
99.9
87.0
100.0
87.1
100.1
87.2
100.2
87.3
100.3
87.4
100.4
87.5
100.5
87.6
100.6
87.7
100.7
87.8
100.8
87.9
100.9
88.0
101.0
88.1
101.1
88.2
101.2
88.3
101.3
88.4
101.4
88.5
88.6
88.7
88.8
88.9
89.0
89.1
89.2
89.3
89.4
89.5
89.6
89.7
89.8
89.9
90.0
X
X
101.5
101.6
101.7
101.8
101.9
102.0
102.1
102.2
102.3
102.4
102.5
102.6
102.7
102.8
102.9
103.0
103.1
103.2
SW1
SW2
B
3
B
3
B
3
B
3
B
3
B
4
C
4
C
4
C
4
C
A
B
B
C
C
D
D
E
E
F
F
0
0
1
1
2
2
3
3
4
C
4
C
4
C
4
C
4
C
4
C
4
C
4
C
4
C
4
4
5
5
6
6
7
7
8
8
9
9
A
A
B
B
C
C
(Continued on next page)
Installation
2-9
Freq. 74-90 Freq. 88-108
MHz
MHz
X
103.3
X
103.4
X
103.5
X
103.6
X
103.7
X
103.8
X
103.9
X
104.0
X
104.1
X
104.2
X
104.3
X
104.4
X
104.5
X
104.6
X
104.7
X
104.8
X
104.9
X
105.0
X
105.1
X
105.2
X
105.3
X
105.4
X
105.5
X
105.6
X
105.7
X
105.8
X
105.9
X
106.0
X
106.1
X
106.2
X
106.3
X
106.4
X
106.5
X
106.6
X
106.7
X
106.8
X
106.9
SW1
SW2
4
C
4
C
4
C
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
5
D
D
E
E
F
F
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
A
A
B
B
C
C
D
D
E
E
F
Freq. 74-90 Freq. 88-108
MHz
MHz
X
107.0
X
107.1
X
107.2
X
107.3
X
107.4
X
107.5
X
107.6
X
107.7
X
107.8
X
107.9
X
108.0
SW1
SW2
D
6
E
6
E
6
E
6
E
6
E
F
0
0
1
1
2
2
3
3
4
4
2-10
2.5 RF Connections
Connect the RF load, an antenna or the input of an external power amplifier, to the type-N, RF
output connector on the rear panel. VSWR should be 1.5:1 or better.
The RF monitor is intended primarily for a modulation monitor connection. Information gained
through this connection can supplement that which is available on the transmitter front panel
displays.
If your transmitter is equipped with the receiver option, connect the incoming RF to the Receiver IN connector.
RF Output
Connector
RF Monitor
Connector
Receiver In
(Receiver Option Only)
Illustration 2–13 RF Connections
Installation
2-11
2.6 Audio Input Connections
Attach audio inputs to the Left and Right XLR connectors on the rear panel. (The Left channel
audio is used on Mono.) Pin 1 of the XLR connector goes to chassis ground. Pins 2 and 3
represent a balanced differential input with an impedance of about 50 kΩ . They may be
connected to balanced or unbalanced left and right program sources.
The audio input cables should be shielded pairs, whether the source is balanced or unbalanced. For an unbalanced program source, one line (preferably the one connecting to pin 3)
should be grounded to the shield at the source. Audio will then connect to the line going to pin
2.
Audio Inputs
(XLR)
Illustration 2–14 XLR Audio Input Connectors
By bringing the audio return line back to the program source, the balanced differential input of
the transmitter is used to best advantage to minimize noise. This practice is especially helpful
if the program lines are fairly long, but is a good practice for any distance.
If the program source requires a 600 Ω termination, see the motherboard configuration chart
on page 4-9 for the proper configuration of the jumpers.
2-12
2.7 SCA Input Connections
You can connect external SCA generators to the SCA In connectors (BNC-type) on the rear
panel. The inputs are intended for the 60 kHz to 99 kHz range, but a lower frequency may be
used if the transmitter is operated in Mono mode. (The 23 to 53 kHz band is used for stereo
transmission.) For 7.5 kHz deviation (10% modulation), input of approximately 3.5–volts (peak
-to-peak) is required.
SCA Inputs
Illustration 2–15 SCA Input Connectors
2.8 Composite Input Connection
You may feed composite stereo (or mono audio) directly to the RF exciter bypassing the internal audio processor and stereo generator. To use the Crown transmitter as an RF Exciter only
("E" version or when using the "T" version with composite input), it is necessary to use the
Composite Input section of the transmitter. This will feed composite stereo (or mono audio)
directly to the RF exciter. In the "T" version, this will bypass the internal audio processor and
stereo generator.
Input sensitivity is approximately 3.5–volt P-P for 75 kHz deviation.
1.
Enable the Composite Input by grounding pin 14 of the Remote I/O connector
(see Illustration 2–18).
2.
Connect the composite signal using the Composite In BNC connector.
Installation
2-13
Composite IN
BNC Connector
Audio Monitor Jacks
Illustration 2–16 Composite In and Audio Monitor Connections
2.9 Audio Monitor Connections
Processed, de-emphasized samples of the left and right audio inputs to the stereo generator
are available at the Monitor jacks on the rear panel. The signals are suitable for feeding a studio monitor and for doing audio testing. De-emphasis is normally set for 75 µsec; set to 50
µsec by moving jumpers, HD201 and HD202, on the Audio Processor/Stereo Generator board.
2.10 Pre-emphasis Selection
Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appropriate pins of header HD1 on the Audio Processor/Stereo Generator board. If you change the
pre-emphasis, change the de-emphasis jumpers HD201 and HD202 on the Audio Processor/
Stereo Generator board to match.
2-14
2.11 Program Input Fault Time-out
You can enable an automatic turn-off of the carrier in the event of program failure. To enable
this option, see remote I/O connector pin out chart on page 2-16. The time between program
failure and carrier turn-off is set by a jumper (JP1) on the Driver Switch Logic board. (See
page 6–3 for board location.) Jumper pins 1 and 2 (the two pins closest to the edge of the
board) for a delay of approximately 30 seconds; pins 3 and 4 for a 2 minute delay; pins 5 and 6
for a 4 minute delay, and pins 7 and 8 for an 8 minute delay. Placing a jumper on pins 9 and
10 will disable the time-out timer.
2.12 Remote I/O Connector
Remote control and remote metering of the transmitter is made possible through a 25 pin, Dsub connector on the rear panel. (No connections are required for normal operation.)
Remote I/O Connector
Illustration 2–17 Remote I/O Connector
Illustration 2–18 Remote I/O Connector (DB-25 Female)
Installation
2-15
Pin Number Function
1.
Ground
2.
FMV Control
3.
Composite Out (sample of stereo generator output)
4.
FSK In (Normally high; pull low to shift carrier frequency approximately 7.5 KHz. Connect to open collector or relay contacts
of user-supplied FSK keyer.)
5.
/Auto Carrier Off (Pull low to enable automatic turnoff of carrier
with program failure.)
6.
Meter Battery (Unregulated DC voltage; 5 VDC=50 VDC)
7.
Meter RF Watts (1 VDC = 100 Watts)
8.
Meter PA Volts (5 VDC = 50VDC)
9.
Remote Raise (A momentary switch, holding this pin low will slowly raise the RF output)
10.
Remote Lower (A momentary switch, holding this pin low will slowly lower the RF output)
11.
Remote SWR (A buffered metering output with a calculated reading of standing wave ratio in
VDC.)
12.
External ALC Control
13.
No Connection
14.
/Ext. Enable (Pull low to disable the internal stereo generator and enable External Composite
Input.)
15.
38 KHz Out (From stereo generator for power supply synchronization. For transmitter
equipped with receiver option, this pin becomes the right audio output for an 8ohm monitor speaker. 38 KHz is disabled.)
16.
ALC
17.
/Carrier Off ( Pull low to turn carrier off)
18.
Fault Summary ( line goes high if any fault light is activated.)
19.
Meter PA Temperature (5 VDC=100 degrees C.)
20.
Meter PA Current (1VDC=10 DC Amperes.)
21.
Front Panel Voltmeter Input.
22.
No Connection.
23.
RDS RX
24.
RDS TX
25.
Ground
2-16
Section 3—Operation
This section provides general operating parameters of your transmitter
and a detailed description of its front panel display.
Operation
3-1
3.1 Initial Power-up Procedures
These steps summarize the operating procedures you should use for the initial operation of the
transmitter. More detailed information follows.
1. Turn on the main power switch.
Main Power
Switch
Illustration 3–2 Front Panel Power Switch
3-2
2. Verify the following:
A. All three power amplifier cooling fans run continuously.
B. The Lock Fault indicator flashes for approximately 5 seconds, then goes off.
3. Set the Input Gain switches for mid-scale wideband gain reduction on an average program
level (see section 3.4).
4. Set the Processing control (see section 3.5; normal setting is “50”).
5. Set the Stereo-Mono switch to Stereo (see section 3.6).
6. Turn on the Carrier switch.
7. Check the following parameters on the front panel multimeter:
A. RF Output power should be set for 600 watts
B. SWR should be less than 1.1. (A reading greater than 1.25 indicates an antenna
mis
match.
C. ALC should be between 4.00 and 6.00 volts.
D. PA DC volts should be 46 to 56 volts. (Varies with antenna match, power and
frequency.)
E. PA DC Amperes should be 12-16 amps. (Varies with antenna match, power, and
frequency.)
F. PA Temperature should initially read 20–35 degrees C (room temperature). After
one hour the reading should be 40–60 degrees C.
G. Driver Supply voltage should be about 24 volts.
H. Voltmeter should be reading 0.0.
The remainder of this section describes the functions of the front panel indicators
and switches.
Operation
3-3
3.2 Power Switches
3.2.1 Power Switch
The main on/off power switch controls both the high voltage and low voltage internal power
supplies.
3.2.2 Carrier Switch
This switch controls power to the RF amplifiers and supplies a logic high to the Driver Switch
Logic board, which enables the power supply for the RF driver.
A "Lock Fault" or a low pin 17 (/Carrier Off) on the Remote I/O connector will hold the carrier
off. (See section 2.12.)
Carrier Switch
Illustration 3–3 Front Panel Carrier Switch
3-4
3.3 Front Panel Bar-Dot Displays
Bar-dot LEDs show audio input levels, wideband and highband audio gain control, and modulation percentage. Resolution for the gain control and modulation displays is increased over a
conventional bar-graph display using dither enhancement which modulates the brightness of
the LED to give the effect of a fade from dot to dot. (See section 4.7.)
3.3.1 Audio Processor Input
Two vertical, moving-dot displays for the left and right channels indicate the relative audio levels, in 3 dB steps, at the input of the audio processor. Under normal operating conditions, the
left and right Audio Processor indicators will be active, indicating the relative audio input level
after the Input Gain switches. During program pauses, the red Low LED will light.
The translator configuration shows relative audio levels from the included receiver.
3.3.2 Highband and Wideband Display
During audio processing, the moving-dot displays indicate the amount of gain control for broadband (Wide) and pre-emphasized (High) audio.
As long as program material causes activity of the Wideband green indicators, determined by
the program source level and Input Gain switches, the transmitter will be fully modulated. (See
section 3.4.)
The Wideband indicator shows short-term “syllabic-rate” expansion and gain reduction around
a long-term (several seconds) average gain set. In the translator configuration, the Wideband
indicator also shows relative RF signal strength.
Program material and the setting of the Processing control determine the magnitude of the
short-term expansion and compression (the rapid left and right movement of the green light).
High-frequency program content affects the activity of the Highband indicator. With 75–µsec
pre-emphasis, Highband processing begins at about 2 kHz and increases as the audio frequency increases. Some programs, especially speech, may show no activity while some music programs may show a great deal of activity.
3.3.3 Modulation Display
A 10–segment, vertical peak-and-hold, bar graph displays the peak modulation percentage. A
reading of “100” coincides with 75 kHz deviation. The display holds briefly (about 0.1 seconds)
after the peak. The “Pilot” indicator illuminates when the transmitter is in the stereo mode.
To verify the actual (or more precise) modulation percentage, connect a certified modulation
monitor to the RF monitor jack on the rear panel.
Operation
3-5
3.4 Input Gain Switches
The “+6 dB” and “+12 dB” slide switches set audio input sensitivity according to the following
table.
Normal Input
Sensitivity
+6dB
Switches
+12dB
+10dBm
Down
Down
+4dBm
Up
Down
-2dBm
Down
Up
-8dBm
Up
Up
Illustration 3–4 Input Gain Switches
Find, experimentally, the combination of Input Gain switch settings that will bring the Wideband
gain-reduction indicator to mid scale for “normal” level program material. The audio processor
will accommodate a fairly wide range of input levels with no degradation of audio quality.
3.5 Processing Control
Two factors contribute to the setting of the Processing control: program material and personal
taste. For most program material, a setting in the range of 40 to 70 provides good program
density. For the classical music purist, who might prefer preservation of music dynamics over
density, 10 to 40 is a good range. The audio will be heavily processed in the 70 to 100 range.
If the program source is already well processed, as might be the case with a satellite feed, set
the Processing to “0” or “10”.
3.6 Stereo-Mono Switch
The Stereo-Mono slide switch selects the transmission mode. In Mono, feed audio only to the
left channel. Although right-channel audio will not be heard as audio modulation, it will affect
the audio processing.
3-6
3.7 RF Output Control
Set this control for the desired output power level. Preferably, set the power with an external
RF wattmeter connected in the coaxial line to the antenna. You may also use the RF power
reading on the digital multimeter.
The control sets the RF output voltage. Actual RF output power varies as the approximate
square of the relative setting of the control. For example, a setting of “50” is approximately 1/4
full power.
3.8 Digital Multimeter
The four-digit numeric display in the center of the front panel provides information on transmitter operation. Use the “Up” and “down” push-buttons to select one of the following parameters.
A green LED indicates the one selected.
Multimeter
Multimeter
Functions
Multimeter push buttons
Illustration 3–5 Digital Multimeter
RF Power—Actually reads RF voltage squared, so the accuracy can be affected by VSWR (RF
voltage-to-current ratio). See section 5.4 for calibration. Requires calibration with the RF reflectometer being used.
SWR—Direct reading of the antenna standing-wave ratio (the ratio of the desired load impedance, 50 ohms, to actual load).
ALC—DC gain control bias used to regulate PA supply voltage. With the PA power supply at
full output voltage, ALC will read about 6.0 volts. When the RF output is being regulated by the
RF power control circuit, this voltage will be reduced, typically reading 4 to 5.5 volts. The ALC
voltage will be reduced during PA DC overcurrent, SWR, or LOCK fault conditions.
Operation
3-7
PA DC Volts—Supply voltage of the RF power amplifier.
PA DC Amps—Transistor drain current for the RF power amplifier.
PA Temperature—Temperature of the RF power amplifier heatsink in degrees C.
Driver Supply Volts—Regulated 24 volt DC supply for the RF driver amplifier.
Voltmeter—Reads the voltage at a test point located on the front edge of the motherboard. A
test lead connected to this point can be used for making voltage measurements in the transmitter. The test point is intended as a servicing aid; an alternative to an external test meter. Remember that the accuracy is only as good as the reference voltage used by the metering circuit. Servicing a fault affected by the reference affects the Voltmeter reading. The metering
scale is 0 to 199.9 volts.
In the translator configuration, you can read a relative indication of RF signal strength numerically in the Voltmeter setting.
3.9 Fault Indicators
Faults are indicated by a blinking red light as follows:
SWR—Load VSWR exceeds 1.5:1. ALC voltage is reduced to limit the reflected RF power.
Lock—Frequency synthesizer phase-lock loop is unlocked. This indicator normally blinks for
about five seconds at power turn-on. Whenever this light is blinking, supply voltages will be
inhibited for the RF driver stage as well as for the RF power amplifier.
Input—The automatic carrier-off circuit is enabled (see sections 2.11 and 2.12) and the absence of a program input signal has exceeded the preset time. (The circuit treats white or pink
noise as an absence of a program.)
PA DC—Power supply current for the RF power output amplifier is at the preset limit. ALC
voltage has been reduced, reducing the PA supply voltage to hold supply current to the preset
limit.
PA Temp—PA heatsink temperature has reached 93° C (199° F).
At about 97°C (207° F), ALC voltage begins to decrease, reducing the PA supply voltage to
prevent a further increase in temperature. By 105° C (221° F) the PA will be at the minimum
output level, of approximately 190 Watts.
3-8
Section 4—Principles of Operation
This section discusses the circuit principles upon which the transmitter
functions. This information is not needed for day-to-day operation of the
transmitter but may be useful for advanced users and service personnel.
Principles of Operation
4-1
4.1 Part Numbering
As this section refers to individual components, you should be familiar with the part numbering
scheme used.
The circuit boards and component placement drawings use designators such as “R1”, “R2”,
and “C1.” These same designators are used throughout the transmitter on several different
circuit boards and component placement drawings. When referencing a particular component
it is necessary to also reference the circuit board that it is associated with.
Resistor R1
Resistor R1
Driver Switch Logic Board
Audio Processor/Stereo Generator Board
Illustration 4–1 Resistor R1 On Different Circuit Boards
4-2
4.2 Audio Processor/Stereo Generator Circuit Board
The audio board provides the control functions of audio processing-compression, limiting, and
expansion, as well as stereo phase-error detection, pre-emphasis and generation of the composite stereo signal.
Illustration 6-4 and accompanying schematic may be useful to you during this discussion. The
overall schematic for the audio board is divided into two sheets; one each for the processor
and stereo generator sections of the board.
Reference numbers are for the left channel. Where there is a right-channel counterpart, reference number are in parenthesis.
Illustration 4–2 Audio Processor/Stereo Generator Board
4.2.1 Audio Processor Section
Audio input from the XLR connector on the rear panel of the transmitter goes to instrument amplifier, U2 (U8). Two-bit binary data on the +6 dB and +12 dB control lines sets the gain of U2
(U8) to one of four levels in 6-dB steps. Gain of U2 is determined by R5, R6, or R7 (R45, R46,
or R47) as selected by analog switch U1.
U3 (U9) is a THAT2180 voltage-controlled amplifier with a control-voltage-to-gain constant of
6.1 mV/dB. The 2180 is a current-in/current-out device, so signal voltages at the input and output will be zero. R11 converts the audio voltage at the output of U2 (U8) to current at the input
of U3 (U9). U3 (U9) output current is converted to audio voltage by U4A (U10A).
U4B (U10B) is a unity-gain inverter. When the positive peaks at the output of U4A (U10A) or
U4B (U10B) exceeds the gain-reduction threshold, U15 generates a 0.25 Volts-per-dB DC control bias, producing wide-band gain reduction for U3 (U9). The dB-linear allows a front-panel
display of gain control on a linear scale with even distribution of dB.
4-3
Q1 (Q2) is a recover/expansion gate with a threshold about 18 dB below the normal program
level. The amount of short-term expansion and time for gain recovery is controlled by the
PROCESSING control, located on the front panel display board. (See section 3.5.)
Audio components above 15,200 Hz are greatly attenuated by eighth-order switched-capacitor
elliptical filter, U5 (U11). The filter cut-off frequency is determined by a 1.52-MHz clock (100 x
15,200 Hz) signal from the stereo generator section of the board. The broadband signal level
at the output of U5 (U11) is about 5 dB below that required for full modulation. (With normal
program material, the 5 dB of headroom will be filled with pre-emphasized audio.)
Pre-emphasis in microseconds is the product of the capacitance of C7 (C17), multiplied by the
current-gain of U6 (U12), times the value of R22 (R62). (For description of the device used for
U6 (12), see explanation for U3 (U9) above.) For a 75 micro-seconds pre-emphasis, the gain
of U6 (U12) will be about 1.11.
Selection of the pre-emphasis curve (75 μS, 50 μS, or Flat) is made by moving the jumper on
HD1 to the pins designated on the board. Fine adjustment of the pre-emphasis is made with
R23 (R63). (See section 5.1.)
For high-band processing, the peak output of U7A (U13A) and U7B (U13B) is detected and
gain-reduction bias is generated, as with the broadband processor. The high-band processing,
however, shifts the pre-emphasis curve rather than affecting overall gain. Peak audio voltages
are compared to plus and minus 5-volt reference voltages at the outputs of U19A and U19B.
This same reference voltage is used in the stereo generator section.
A stereo phasing error occurs when left and right inputs are of equal amplitude but opposite
polarity. The most common cause is incorrect wiring of a left or right balanced audio line
somewhere in the program chain-sometimes at the source of a recording. When this happens,
all the audio is in the left-minus-right stereo subcarrier-none in the left-plus-right baseband.
The error can go unnoticed by one listening on a stereo receiver, but the audio may disappear
on a mono receiver. In normal programming there may be short-term polarity reversals of left
versus right, either incidental or-for effect-intentional. A phase error of several seconds duration is processed by U14A and U14B and interpreted as a real error. During a phasing error
the right-channel level is gradually reduced by 6 dB. For a listener to a stereo radio, the rightchannel volume will be lower, while on a mono receiver there will be a reduction of volume.
NORMAL/TEST switch. In the TEST position, the stage gains are set to a fixed level. See section 6.2
4.2.2 Stereo Generator Section
Composite stereo signal is generated from left and right-channel audio inputs. This section
also has the amplifier (U201) for an optional external composite input and provision for insertion of SCA signal(s).
4-4
Processed, pre-emphasized left and right audio is passed through third-order lowpass filters
comprised of U202A (203A) and associated circuitry. The filters decrease the level of audio
products below 30 Hz. This low-frequency roll off is necessary to prevent disturbance to the
phase-lock loop in the RF frequency synthesizer by extremely low-frequency audio components. (See caution at section 2.8.)
U204 is a precision, four-quadrant, analog multiplier. The output of U204 is the product of 38
kHz applied to the Y input and the difference of left and right audio (L-R signal) applied to the X
input. The resulting output is a double sideband, suppressed carrier/the L-R subcarrier.
Spectral purity of the stereo subcarrier is dependant on a pure 38-kHz sine wave at the multiplier input.
U207A and Y201 comprise a 7.6-MHz crystal oscillator from which the 19 and 38-kHz subcarriers are digitally synthesized. U207F is a buffer. The 7.6 MHz is divided by 5 in U208A to provide 1.52 Mhz, used by switched-capacitor filters U5 and U11 in the audio section. 3.8 MHz,
1.9 MHz, and 304 kHz are also derived from dividers in U208. Exclusive-OR gates, U210C
and U210D, provide a stepped approximation of a 38-kHz sine wave. With the resistor ratios
used, the synthesized sine wave has very little harmonic energy below the 7th harmonic.
U210A and B generate the 19-kHz pilot subcarrier. U211 is a dual switched-capacitor filter,
configured as second-order, low-pass filters, each one with a Q of 5. The 38 and 19-kHz outputs of pins 1 and 20, respectively, are fairly pure sine waves. Harmonic distortion products
are better than 66 dB down-with a THD of less than 0.05%. SEPARATION control R244 sets
the 38-kHz level at the Y input of U204.
Resistor matrix R219, R220, R221, and R223 sum the L+R audio with the L-R subcarrier to
produce a current at the junction of R221 and R223 that will be converted to composite stereo
(less pilot) at the output of summing amplifier U206A. SCA signal is also injected at the input of
U206A. 19-kHz pilot is combined with composite stereo in summing amplifier U206B.
Analog switch U205, at the input of U206A, provides switching of left and right audio for stereo
and mono modes. In the mono mode, right channel audio is disabled, and the left channel audio is increased from 45% modulation to 100%.
MON L and MON R outputs go to the AF Monitor jacks on the rear panel. R209+R210
(R214+R215) and C207 (C210) is a de-emphasis network. Processed, de-emphasized samples of the left and right audio are used for a studio monitor and for audio testing. Jumpers at
HD201 (HD202) allow selection of 50-μsec or 75-μsec de-emphasis.
VR212A and B supply +7 volts and -7 volts, respectively. A 5-volt reference from the audio
processor section supplies the subcarrier generators.
For an explanation of on-board adjustments see section 5.2.
4-5
4.3 RF Exciter Circuit
This circuit is also known as the Frequency Synthesizer. The Frequency Synthesizer part of
the motherboard is no longer a separate module as was the case on older transmitters. The
entire component side of the motherboard is a ground plane. Frequency selector switches
located on the front panel of the transmitter establish the operating frequency. The VCO
(voltage-controlled oscillator) circuitry is inside an aluminum case.
Illustration 6-6 and accompanying schematics can be used as reference in this
discussion.
VCO1 operates at the synthesizer output frequency of 87 MHz to 108 MHz.
The frequency is controlled by a voltage applied to pin 8 of the VCO. A sample of the RF
comes from A2 and is fed to the PLL chip U13. U13 is a phase-locked-loop frequency synthesizer IC. The 10.24 MHz from the crystal oscillator is divided to 10 kHz. Internal programmable dividers divide the 87 - 108 MHz RF to 10 kHz. Differences between the two signals produce error signals at pins 7 and 8 of U14.
Exciter Circuits
Illustration 4–3 Motherboard (Exciter Circuits)
Frequency selector switches are read by shift registers U17 and U18. Data from the shift registers is read by U16 which then programs the PLL (Phase Lock Loop) IC U13.
U14B is a differential amplifier and filter for the error signal. Audio that is out of phase with that
appearing on the error voltage is introduced by U14A, allowing for greater loop bandwidth with
less degradation of the low frequency audio response.
Lock and unlock status signals are available at the outputs of U15E and U15F respectively.
Modulation is introduced to the VCO though R72 and R122.
4-6
4.4 Metering Circuit
The ALC and metering circuitry is on the motherboard (see Illustration 6–6). This circuit processes information for the RF and DC metering, and produces ALC (RF level-control) bias. It
also provides reference and input voltages for the digital panel meter, voltages for remote metering, and drive for the front-panel fault indicators.
Illustration 6–6 and accompanying schematics complement this discussion.
PA voltage and current come from a metering shunt on the Driver Switch Logic board. The
PAI input is a current proportional to PA current; R153 converts the current to voltage used for
metering and control. A voltage divider from the PAV line is used for DC voltage metering.
Metering Circuits
Illustration 4–4 Motherboard (Metering Circuits)
U23A, U23B, and U24A, with their respective diodes, are diode linearity correction circuits.
Their DC inputs come from diode detectors in the RF reflectometer in the RF low-pass filter
compartment.
U24B, U24C, are components of a DC squaring circuit. Since the DC output voltage of U24C is
proportional to RF voltage squared, it is also proportional to RF power.
U22C, U22A, U20A, and U22D are level sensors for RF power, reflected RF power, PA temperature, and external PA current, respectively. When either of these parameters exceeds the
limits, the output of U22B will be forced low, reducing the ALC (RF level control) voltage,
which, in turn, reduces the PA supply voltage.
The DC voltage set point for U22A (reflected RF voltage) is one-fifth that of U22C (forward RF
voltage). This ratio corresponds to an SWR of 1.5:1 [(1+.2)/(1– .2)=1.5]. The U25 inverters
drive the front panel fault indicators.
4-7
4.5 Motherboard
The motherboard is the large board in the upper chassis interconnecting the audio processor/
stereo generator board or the optional receiver module to the RF exciter and metering circuits.
The motherboard provides the interconnections for this boards, eliminating the need for a wiring harness, and provides input/output filtering. The RF exciter and Metering circuits are an
integral part of the motherboard and are no longer separate boards as in past transmitter designs.
Also contained on the motherboard is the +5.00 volt reference and the composite drive Op
amp and its associated circuitry.
The motherboard has configuration jumpers associated with different options that can be
added at the time of order or at a later time as an upgrade. The motherboard configuration
chart for these jumpers can be found on the following page.
Configuration
Jumpers
Illustration 4–5 Motherboard Configuration Jumpers
4-8
Jumper
FMA “E”
FMA “T”
50k-Ohm Input
FMA “T”
600-Ohm Input
FMA “R”
Z1
Short
Short
Short
Short
Z2
Short
Short
Short
Short
Z3
Open
Open
Short
Open
Z4
Open
Open
Open
Open
Z5
Open
Open
Short
Open
Z6
Open
Open
Open
Open
Z7
Open
Open
Short
Open
Z8
Open
Open
Short
Open
Z9
Short
Open
Open
Open
Z10
Short
Open
Open
Open
Z11
Short
Open
Open
Open
Z12
Short
Open
Open
Open
Z13
Short
Open
Open
Open
Z14
Short
Open
Open
Open
Z15
Open
Open
Open
Open
Z16
Open
Open
Open
Open
Z17
Open
Open
Open
Open
Z18
Open
Open
Open
Open
Z19
Open
Open
Open
Open
Z20
Open
Open
Open
Open
Z21
Open
Open
Open
Open
Z22
Open
Open
Open
Open
Z23
Short
Short
Short
Short
Z24
Short
Short
Short
Short
Z25
Short
Short
Short
Short
Z26
Short
Short
Short
Short
Z27
Short
Short
Short
Short
Z28
Short
Short
Short
Short
Z29
Short
Short
Short
Short
Z30
Short
Short
Short
Short
Z31
Open
Open
Open
Open
Z32
Short
Open
Open
Open
Z33
Short
Open
Short
Open
JMP1
Open
Open
Open
Open
JMP2
Open
Open
Open
Open
Motherboard Jumper Configuration Chart 4.6.1
4-9
4.6 Display Circuit Board
The front-panel LEDs, the numeric display, the slide switches, and the processing and RF level
controls are mounted on the display circuit board. To access the component side of the board,
remove the front panel by removing 12 screws. The board contains circuits for the digital panel
meter, modulation peak detector, and LED display drivers, as well as indicators and switches
mentioned above.
Illustration 6–9 and accompanying schematic complement this discussion.
Left and right audio from input stages of the audio processor board (just after the Input Gain
attenuator) go to the L VU and R VU input on the display board. Peak rectifiers U1A and U1B
drive the left and right Audio Input displays. The LED driver gives a 3–dB per step display.
The lowest step of the display driver is not used; rather a red LOW indicator lights when audio
is below the level of the second step. Transistors Q1 and Q2 divert current from the LOW
LEDs when any other LED of the display is lit.
Resolution of the linear displays, High Band, Wide Band, and Modulation, has been improved
using dither enhancement. With dither, the brightness of the LED is controlled by proximity of
the input voltage relative to its voltage threshold. The effect is a smooth transition from step to
step as input voltage is changed. U6A, U6B, and associated components comprise the dither
generator. Dither output is a triangular wave.
Composite stereo (or mono) is full-wave detected by diodes D5 and D6, U7, U13, Q3, and Q4
are components of a peak sample-and-hold circuit.
Oscillator, U9F, supplies a low-frequency square wave to the Fault indicators, causing them to
flash on and off.
Digital multimeter inputs are selected with push buttons located to the right of the multimeter
menu. Signals from the push buttons are conditioned by U9A and U9B. U10 is an up/down
counter. Binary input to U11 from U10 selects a green menu indicator light, and lights the appropriate decimal point on the numeric readout. The binary lines also go to analog data selectors on the ALC/ metering board.
Processing control, R50, is part of the audio processor. (See section 4.2.)
The DPM IN and DPM REF lines are analog and reference voltage inputs to digital multimeter
IC U12. They originate from analog data selectors on the ALC/ metering board.
4-10
4.7 Driver Switch Logic Circuit Board
The Driver Switch Logic board is mounted on the bottom side of the transmitter chassis with
the two power supplies. The Driver Switch Logic board performs the following five different
functions, program audio detection, audio fail timer, PA current monitor, PSU2 voltage monitor,
and driver switch.
The program audio detection circuit and the audio fail timer is made up of U3,U4, and U5. U3A
and U3B and associated circuitry discriminate between normal program material and white
noise ( such as might be present from a studio transmitter link during program failure) or silence. U3A and surrounding components form a band-pass filter with a Q of 3 tuned to about
5kHz. U3B is a first-order low pass filter. Red (DS3) and green (DS4) LEDs on the board indicate the presence or absence of program determined by the balance of the detected signals
from the two filters. U5 and U4B form a count-down timer. The time between a program fault
and shutdown is selected by jumpering pins on header JP1. For times, see section 5.7. The
times are proportional to the value of R28 ( that is, times can be doubled by doubling the value
of R28). When the timer circuit times out, a red LED (DS2) will illuminate giving a visual indication of the audio fail timers status.
The PA current monitor circuit consists of R45(R51) U6(U7), U8 and associated circuitry.
Note that components listed in parentheses ( ) are used in the PA current monitor for PA2.
Current passing through R45(R51) creates a voltage drop that is measured by the current
monitor U6(U7). U6(U7) has a gain of 5. The output voltage from U6(U7) is delivered to opamp U8A (U8B) which has a gain of 4. The outputs of U8A and U8B are summed together
through R47 and R53. The summed output equals the total currents drawn by both RF power
amplifiers PA1 and PA2. This total current draw is displayed on the front panel as PA DC
Amps.
The PSU2 voltage monitor is used to monitor the status of the high voltage power supply and
determines if it is stable and operational. The PSU2 voltage monitor circuit is made up of R29,
R30, U9A ,U11 and associated circuitry. R29 and R30 create a voltage divider circuit that
scales down the voltage from the high voltage power supply. The scaled down power supply
voltage is fed to comparator U9A. When the high voltage power supply has an output voltage
above 21 volts, the output of comparator U9A goes high. The output of U9A is fed to inverter
U11B which inverters the signal creating a logic low output. This output is fed to NOR gate
U2C in the driver switch circuit. The logic high signal from U9A is also fed to U11A which enables the green LED (DS8) indicating that the voltage from the high voltage power supply is
OK.
The driver switch circuit is the last circuit on the driver switch logic board that determines if the
driver amplifier should be enabled based on the status of the above mentioned circuits. The
driver switch circuit consists of U2C, Q1, Q2 and associated circuitry. Logic gate U2C is a
NOR gate. The inputs to U2C are the outputs of the PSU2 voltage monitor and the audio fail
timer circuits. If the outputs from the PSU2 voltage monitor circuit and the audio fail timer circuit are at a logic low, the resulting output of U2C will be a logic high, enabling transistor Q1
and turning on green LED (DS1) indicating that the driver amplifier should be enabled. When
Q1 is turned on, this will place about –8.8 volts (w/respect to the source of Q2) on the gate of
the P-channel MOSFET Q2. This will cause MOSFET Q2 to conduct, delivering +24 volts to
the driver amplifier, thus enabling the RF output.
4-11
4.7 Driver Switch Logic Circuit Board, continued
Also present on the Driver Switch Logic board are power supply diagnostic LEDs and various
circuit test points.
Several green LEDs give a visual indication that the power supplies are functioning. The LEDs
do not indicate that the voltage is correct for its given power supply, they are just merely an
indication that voltage is present. LED DS7 is the indicator for the +5 volt power supply, DS5
is the indicator for the +12 volt power supply and DS6 is for the –12 volt power supply.
Test points that are present on the board can be used to measure various power supply and
circuit voltages . See illustration 4-6 for test point descriptions and typical voltages.
Test Point
Description
Voltage
TP1
-12V DC supply
-11.76v to -12.24v
TP2
+12V DC supply
11.76v to 12.24v
TP3
+24V Driver supply (switched)
23.52v to 24.48v
TP4
+24V DC supply
23.52v to 24.48v
TP5
Ground
0v
TP6
+5V DC supply
4.9v to 5.1v
TP7
PA1 Drain current/10
.100v = 10 amps
TP8
PA2 Drain current/10
.100v = 10 amps
TP9
ALC Control voltage
0v to 6v
TP10
Ground
0v
TP11
Audio filter output
**See text below
Illustration 4–6 Driver Switch Logic Board Test Points
The voltages listed in the chart are approximate values. The colors in the left hand column indicate the color of the test point on the circuit board.
The audio filter output test point voltage should be 0 volts during an audio fault such as during
silence or a loss of program audio. This voltage will be constantly changing while program audio is present. This circuit is only active if the /Auto Carrier line has been pulled low by
grounding pin 5 on the Remote I/O connector on the back of the transmitter.
See illustration 4-7 for diagnostic LED and test point positions on the Driver Switch Logic
board.
4-12
TP10
TP11
TP6
TP9
TP1
DS1
TP2
DS2
TP3
DS3
JP1
DS4
DS5
TP4
DS6
TP5
DS7
DS8
TP7
TP8
Illustration 4–7 Driver Switch Logic Board
4.8 RF Driver
The RF Driver module is mounted next to the heat sinks on the bottom of the RF Amplifier/
Combiner sub chassis. The driver amplifies the approximate 20 milliwatts from the frequency
synthesizer to about 20 watts to drive the RF power amplifiers. A CA2832 hybrid, high-gain,
wideband amplifier, operating at about 20 volts, provides about one watt of drive to a single
BLF245 MOSFET amplifier. The BLF245 stage operates from a supply voltage of approximately 24 volts.
The circuit board provides for input/output coupling and for power supply filtering.
4-13
4.9 RF Amplifier
The RF power amplifier modules are mounted on a combiner board, heat sink, slide rail assembly which slides into the main chassis at the rear, and is fastened to the back panel with
six screws. RF power, DC power, and control voltages enter the PA assembly through a 72-pin
edge connector that slides into at the front of the chassis.
The amplifier is built around two SD2942, dual power MOSFET’s rated for 50 volts DC and a
maximum power of about 350 watts. When biased for class B, the transistor has a power gain
of 20dB. The RF power amplifier is biased below class B in the transmitter.
Input transformer, T1111, is made up of two printed circuit boards. The four-turn primary board
is separated from the one-turn secondary by a thin dielectric film. R1112-R1117 are for damping. Trim pot R1111 sets the bias.
Output transformer, T1121, has a one-turn primary on top of the circuit board and a two-turn
secondary underneath. Inductors L1121 and L1122 provide power line filtering.
The amplifiers are surrounded by a 50 Ohm impedance, input/output combiner board which
takes 15 watts input and divides it equally to each power amp. Then the output from each amplifier is combined to for a single output.
RF Driver
Amplifier
RF Power
Amplifiers
Illustration 4–7 RF Power Amplifier Module
4-14
4.10 Chassis
The high voltage and low voltage power supplies, as well as the driver switch logic board are
mounted on the bottom side of the chassis.
Driver Switch
Logic Board
High Voltage
Supply
Low Voltage
Supply
Illustration 4–8 Chassis Bottom View
4.11 RF Output Filter & Reflectometer
The RF low-pass filter/reflectometer is located in the right-hand compartment on the top of the
chassis. See Illustration 6–13 and accompanying schematic for more information.
A ninth-order, elliptic, low-pass filter attenuates harmonics generated in the power amplifier.
The capacitors for the filter are circuit board pads.
The reflectometer uses printed circuit board traces for micro-strip transmission lines. Transmission line segments (with an impedance of about 82 ohms) on either side of a 50–ohm conductor provide sample voltages representative of the square root of forward and reverse
power.
DC voltages, representative of forward and reflected power, go through a bulkhead filter board
to the motherboard, then to the metering board, where they are processed for power control
and metering and for SWR metering and protection.
4-15
4.12 Receiver Circuit Board Option
This option allows the transmitter to be used as a translator. The receiver board receives terrestrially fed RF signal and converts it to composite audio which is then fed into the exciter
board. Microprocessor controlled phase lock loop technology ensures the received frequency
will not drift, and multiple IF stages ensure high adjacent channel rejection. Refer to Illustrations 4–6, 6–16 and its schematic for the following discussion.
The square shaped metal can located on the left side of the receiver board is the tuner module.
The incoming RF signal enters through the BNC connector (top left corner) and is tuned
through the tuner module. Input attenuation is possible with the jumper labeled “LO” “DX”, on
the top left corner of the receiver board. Very strong signals can be attenuated 20 dB automatically by placing the jumper on the left two pins (“LO” position). An additional 20 dB attenuation is also available with the jumpers in the top left corner of the board. The frequencies
are tuned by setting switches SW1 and SW2 (upper right corner). These two switches are
read upon power up (or by momentarily shorting J7) by the microprocessor (U4). The microprocessor then tunes the tuner module to the selected frequency. The frequency range is 87.9
Mhz at setting “00” to 107.9 Mhz at setting “64”. Other custom ranges are available.
Located in the lower left-hand corner of the Receiver Module is a 3.5mm headphone jack. Demodulated Left and Right audio is present at this jack. A regular pair of 32 ohm stereo headphones, such as the types used with portable audio devices, can be used to monitor the audio
on the receiver module.
Receiver
Module
Illustration 4–9 Receiver Module
4-16
4.12 Receiver Circuit Board Option (Continued)
When a stereo signal is present, LED 3 illuminates which indicates that left and right audio is
available. Then the stereo signals go to gain stages and out to the RCA jacks on the back of
the cabinet. These can be used for off-air monitoring of the audio signal. Incoming frequency
can be monitored from the frequency monitor BNC jack on the back. The stereo buffer, stereo
decoder, and gain stages and have no effect on the signal that goes through the transmitter.
The power supply is fairly straight forward. The incoming 12 volt supply goes to a 7809, 9 volt
regulator (VR1) which supplies all 9–volt needs on the board. The 9 volts also supplies a
7805, 5 volt regulator (VR2) which supplies all 5–volt needs on the board. Plus and minus 12
volts from the motherboard is filtered and supplies various needs on the board. Finally there is
a precision reference voltage. Two 2.5 volt reference shunts act very much like a very accurate zener diode to provide a precision 5 volt supply to the metering board.
Illustration 4–10 Receiver Module
4-17
Notes
4-18
Section 5—Adjustments and Tests
This section describes procedures for (1) advanced users who may be interested in customizing or optimizing the performance of the transmitter
and (2) service personnel who want to return the transmitter to operational
status following a maintenance procedure.
Adjustments and Tests
5-1
5.1 Audio Processor Adjustments
5.1.1 Pre-Emphasis Selection
Select the pre-emphasis curve (75 µsec, 50 µsec, 25 µsec, or Flat) by jumpering the appropriate pins of header HD1 on the audio processor/stereo generator board. (See section 2.10.) If
you change the pre-emphasis, change the de-emphasis jumpers, HD201 and HD202 on the
audio processor/stereo generator board, to match. (See section 2.10.)
5.1.2 Pre-Emphasis Fine Adjustment
Trim potentiometers, R23 and R63, (for left and right channels, respectively) provide for fine
adjustment of the pre-emphasis. Set the potentiometers to bring the de-emphasized gain at 10
kHz equal to that of 400 Hz. (At the proper setting, 15.0 kHz will be down about 0.7 dB.)
When making these adjustments, it is important that you keep signal levels below the processor gain-control threshold.
A preferred method is to use a precision de-emphasis network in front of the audio input.
Then, use the non-de-emphasized (flat) output from the FM modulation monitor for measurements.
5.2 Stereo Generator Adjustments
5.2.1 Separation
Feed a 400–Hz sine wave into one channel for at least 70% modulation. Observe the classic
single-channel composite stereo waveform at TP1 in the RF Exciter circuit of the Motherboard.
Adjust the Separation control R244 for a straight centerline.
Since proper adjustment of this control coincides with best stereo separation, use an FM monitor to make or confirm the adjustment.
5-2
5.2.2 Composite Output
You can make adjustments to the composite output in the following manner:
Using a Modulation Monitor
1. Set the Stereo-Mono switch to Mono.
2. Check that the setting of the Modulation compensation control (see Illustration 2–9) on the
RF Exciter circuit, falls within the range specified for the frequency of operation. (See section 2.3.1.)
3. Feed a sine wave signal of about 2.5 kHz into the left channel at a level sufficient to put the
wideband gain-reduction indicator somewhere in the middle of its range.
4. Set the Composite level control to produce 90% modulation as indicated on an FM monitor.
5. Apply pink noise or program material to the audio inputs and confirm, on both Mono and
Stereo, that modulation peaks are between 95% and 100%.
5.2.3 19–kHz Level
Adjust the 19–kHz pilot for 9% modulation as indicated on an FM modulation monitor.
(The composite output should be set first, since it follows the 19–kHz Level control.)
5.2.4 19–kHz Phase
1. Apply a 400–Hz audio signal to the left channel for at least 70% modulation.
2. Look at the composite stereo signal at TP301 on the RF Exciter circuit board with an oscilloscope, expanding the display to view the 19–kHz component on the horizontal centerline.
3. Switch the audio to the right-channel input. When the 19–kHz Phase is properly adjusted,
the amplitude of the 19–kHz will remain constant when switching between left and right.
4. Recheck the separation adjustment as described in section 5.2.1.
5.3 Frequency Synthesizer Adjustments
5.3.1 Frequency (Channel) Selection
Refer to section 2.3.
5-3
Refer to section 2.3.1
5.3.3 Frequency Measurement and Adjustment
Next to the 10.24–MHz VCXO in the RF Exciter circuit on the motherboard is a 50K potentiometer (R101). Use R101 to set the frequency of the 10.24–MHz VCXO while observing the
output frequency of the synthesizer.
Use one of two methods for checking frequency:
1. Use an FM frequency monitor.
2. Couple a frequency counter of known accuracy to the output of the synthesizer and observe the operating frequency.
5.3.4 FSK Frequency Offset Control
An FSK signal (used for automatic identification of FM repeaters) shifts the frequencies of the
10.24–MHz VCXO reference oscillator and the VCO.
Ground pin 4 on the DB25 connector located on the back panel of the transmitter. This will
shift the operating frequency. Adjust R224 for an offset of the operating frequency of about 6
kHz. Un-grounding pin 4 will cause the operating frequency to return to normal.
Use one of two methods for checking frequency:
1. Use an FM frequency monitor.
2. Couple a frequency counter of known accuracy to the output of the synthesizer and observe the operating frequency.
5.4 Metering Adjustments
5.4.1 Power Calibrate
While looking at RF Power on the digital panel meter, set the Power Calibrate trim potentiometer (R215) to agree with an external RF power meter.
5.4.2 Power Set
With the front panel RF Output control fully clockwise, adjust the Power Set trim pot to 10%
more than the rated power (660 watt for FM600) as indicated on an accurate external watt meter. If the authorized power is less than the maximum watts, you may use the power set to limit
the range of RF output control. Operation below 200 watts is not possible due to the switching
power supply not being able to reach zero volts.
5-4
5.4.3 SWR Calibrate
When the Carrier switch is off, or the RF power is less than about 5 watts, the SWR circuit
automatically switches to a calibrate-check mode. (See section 4.5 for more information.)
Set the digital panel meter to read SWR. With the Carrier switch off, set the SWR CAL trim pot
(R66) to read 1.03.
5.4.4 PA Current Limit
Since it may not be practical to increase the PA current to set the PA Current Limit control, you
may use this indirect method.
With the carrier turned off, look at the DC voltage at the right end of R413 in the Metering circuit on the motherboard. The current limit, in amperes, will be 0.35 amps higher than ten times
this voltage. Set the current limit for 17.55 amps or 1.72 volts at R413.
5.5 Motherboard Configuration
See section 4.6.1 for motherboard jumper configuration.
5.6 Display Modulation Calibration
The Modulation Calibrate trim pot sets the sensitivity of the front panel Modulation bar graph
display.
This adjustment may be made only after the Output trim pot on the Audio Processor/Stereo
Generator board has been set. (See section 5.2.2.)
Set the Stereo-Mono switch to Mono.
Feed a sine wave source of about 2.5 kHz into the left channel at a level sufficient to put the
wideband gain-reduction indicator somewhere in the middle of its range.
Set the Modulation Calibrate trim pot so that the “90” light on the front panel Modulation display
just begins to light.
5-5
5.7 Driver Switch Logic Board Adjustments
JP1, a 10–pin header on the Driver Switch Logic board, sets the time between program failure
and carrier disable (automatic turnoff). The times are approximate. Sections 2.11, 2.12, and
4.7 contain further information.
1. Short pins 1 and 2 for a 30 second delay.
2. Short pins 3 and 4 for a 2 minute delay.
3. Short pins 5 and 6 for a 4 minute delay.
4. Short pins 7 and 8 for an 8 minute delay.
5. Short pins 9 and 10 to disable the circuit.
You may select other times by changing the value of R28. The time is proportional to the resistance.
5.8 Bias Set (RF Power Amplifier)
The Bias Set trim pot is located inside the PA module on the input circuit board. Set the trim
pot to its full clock-wise position for near-optimum bias.
5-6
5.9 Performance Verification
Measure the following parameters to receive a comprehensive characterization of transmitter performance:
•
Carrier frequency
•
RF output power
•
RF bandwidth and RF harmonics (see section 5.12)
•
Pilot frequency, phase, and modulation percentage
•
Audio frequency response
•
Audio distortion
•
Modulation percentage
•
FM and AM noise
•
Stereo separation between left and right
•
Crosstalk between main channel and subcarrier
•
38–kHz subcarrier suppression
•
In addition to the above tests, which pertain to signal quality, a complete check of the
unit will include items listed in section 5.21.
5.9.1 Audio Proof-of-Performance Measurements
References to “100%” modulation assume 9% pilot and 91% for the remainder of the composite stereo signal.
Because the audio processing threshold is at 90% modulation, it is not possible to make
audio proof-of-performance measurements at 100% modulation through the audio processor. Instead, data is taken at a level below the audio processing threshold at 80% modulation.
5.9.2 De-emphasis Input Network
A precision de-emphasis network, connected between the test oscillator and the audio input of the transmitter, can be very helpful when making the audio measurements. Note
that the input impedance of the transmitter or the source impedance of the test oscillator
can affect network accuracy. With the de-emphasis network, oscillator level adjustments
need only accommodate gain errors, instead of the whole pre-emphasis curve.
5-7
5.10 Carrier Frequency
Carrier frequency is measured at the output frequency with a frequency monitor or suitable
frequency counter.
To adjust frequency, see section 5.3.3. (FCC tolerance +/– 2000 Hz per FCC Part 73.1540
and 73.1545.)
5.11 Output Power
The output power reading on the front panel display should be 90–105% of the actual value.
For a more precise measurement, use a watt meter in the RF output line. See sections
5.4.1 and 5.4.2 for setting power.
5.12 RF Bandwidth and RF Harmonics
You can observe RF bandwidth and spurious emissions with an RF spectrum analyzer.
In the Stereo mode, feed a 15.0–kHz audio signal into one channel to provide 85% modulation as indicated on a monitor. Doing so produces 38% main, 38% stereo subcarrier, and
9% pilot per FCC Part 2.1049. As an alternative, use pink noise into one channel.
Using a spectrum analyzer, verify the following (per FCC 73.317):
1. Emissions more than 600 kHz from the carrier are at least 43 + 10log (power, in watts)
dB down (71 dB for 600 watts). The scan should include the tenth harmonic.
2. Emissions between 240 kHz and 600 kHz from the carrier are down at least 35 dB.
3. Emissions between 120 kHz and 240 kHz from the carrier are down at least 25 dB.
5.13 Pilot Frequency
The pilot frequency should be within 2 Hz of 19 kHz. (FCC Part 73.322.) Using a frequency
counter, measure 1.9 MHz at pin 13 of U208 on the Audio Processor/Stereo Generator
board. A 200–Hz error here corresponds to a 2–Hz error at 19 kHz. If the frequency is off
by more than 50 Hz, you may change the value of C213. (Changing C213 from 56 pF to 68
pF lowers the 1.9 MHz by about 35 Hz.)
5.14 Audio Frequency Response
For the response tests, take the readings from an FM modulation monitor.
Make audio frequency response measurements for left and right channels at frequencies of
50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2.
5-8
5.15 Audio Distortion
Make distortion measurements from the de-emphasized output of an FM modulation monitor.
Make audio distortion measurements for left and right channels at frequencies of 50 Hz, 100
Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz. See sections 5.9.1 and 5.9.2.
5.16 Modulation Percentage
While feeding an audio signal into the left channel only, confirm that the total modulation
percentage remains constant when switching between Mono and Stereo.
Measure modulation percentage with an FM modulation monitor. See section 5.2.2.
19–kHz pilot modulation should be 9%.
5.17 FM and AM Noise
Take noise readings from a de-emphasized output of a modulation monitor.
5.18 Stereo Separation
Make left-into-right and right-into-left stereo separation measurements with an FM modulation monitor for frequencies of 50 Hz, 100 Hz, 400 Hz, 1 kHz, 5 kHz, 10 kHz, and 15 kHz.
5.19 Crosstalk
For stereo crosstalk measurements, both left and right channels are fed at the same time.
For best results, there needs to be a means of correcting small imbalances in levels and
phase. The balance is made at 400 Hz.
5.19.1 Main Channel Into Sub
Feed the left and right channels in phase with audio (L+R) at 50 Hz, 100 Hz, 400 Hz, 1 kHz,
5 kHz, 10 kHz, and 15 kHz at 100% modulation, while observing the stereo subcarrier (L-R)
level on an FM modulation monitor.
5.19.2 Sub Channel Into Main
Feed the audio into the left and right channel as above, with the exception of reversing the
polarity of the audio of one channel (L-R input). Using the frequencies of 5.19.1 above, observe the main channel (L+R) level with a modulation monitor.
5-9
5.20 38–kHz Subcarrier Suppression
With no modulation, but in the Stereo mode, the 38–kHz subcarrier, as indicated on an FM
modulation monitor, should be down at least 40 dB.
5.21 Additional Checks
In addition to the tests and adjustments mentioned in this section, the following checks ensure a complete performance appraisal of the transmitter:
1. Perform a physical inspection, looking for visible damage and checking that the chassis
hardware and circuit boards are secure.
2. Check the functionality of switches and processing control.
3. Verify that all indicators function.
4. Check the frequency synthesizer lock at 80 MHz and 110 MHz.
5. Measure the AC line current with and without the carrier on.
6. Perform a functional test of the SCA input, Monitor outputs, and the monitor and control
function at the 15–pin, D-sub connector.
7. Test the functionality of the FSK circuit.
8. Check the operation and timing of the automatic carrier-off circuitry associated with program failure.
9. Check all metering functions.
10. Test ALC action with PA current overload, SWR, and PLL lock.
NOTE:
FCC type acceptance procedures call for testing the carrier frequency over the temperature
range of 0–50 degrees centigrade, and at line voltages from 85% to 115% of rating. (See
FCC Part 2.1055.)
5-10
FM600 Manual
Section 6—Reference Drawings
The illustrations in this section may be useful for making adjustments,
taking measurements, troubleshooting, or understanding the circuitry of
your transmitter.
Reference Drawings
6-1
6.1 Views
Multimeter Select
Gain
Reduction/Expansion
Indicators
Digital Multimeter
Stereo/Mono
Switch
Fault Indicators
Modulation Indicators
Input Level
Indicators
Carrier Switch
Power Switch
RF Output
Control
Input Gain
Switches
Frequency
Selector
Switches
Processing Control
Illustration 6-1 Front View
RF Output
Composite Input
RF Output Monitor
Receiver Input
(Optional)
SCA Inputs
Remote I/O
Audio Monitors
Audio Inputs
Ground
Stud
Fuse
Holder
AC Power Input
Illustration 6-2 Rear View
6-2
RF Output
RF Exciter
Circuit
RF Low Pass
Filter &
Reflectometer
Stereo Generator
Section
Audio Processor
Section
Metering
Circuit
Illustration 6-3 Chassis Top View
Driver Switch
Logic Board
High Voltage
Power Supply
Low Voltage
Power Supply
Illustration 6-4 Chassis Bottom View
6-3
Notes:
6-4
6.2 Board Layout and Schematics
Illustration 6-5 Audio Processor/Stereo Generator Board
6-5
DWG. NO.
3
REV.
4
5
GAIN R9-14
--------------------------0dB OPEN
+6dB 50.5K
+12dB 16.8K
+18dB 7.21K
C5
D1
1N6263
6
7
R12
49.9
R6
2.00K
D2
1N6263
R13
49.9
49.9
R5
R14
5.1K
R17
10
NC
COMP1*
Vout
INV A
NC
1uF
9
R22
8
24.9K
C6A
Q1
2N5087
7
+5V
-7V
DS1
DS2
1N5818 1N5818
C29
10uF
510
R68
1.0K
D8
1N6263
R54
5.1K
1N4148
R84
D25
10M
D26
4
6
5
4
3
U12
THAT2180
TL072
499
+12V
POLY
D13
1
R79
TL072
10K
1
IN
R92
49.9K
-12V
+7V
+7V
C19
2200pF
-7V
POLY
-7V
VDD
D10
1N6263
8
E
+5V
+5.00V
+5V
R76
24.9K
6
R63
10K
(J3-16)
R96
R97
PROC B
ZERO
10M
(J3-18)
-5V
U13B
TL072
R64
30K
R65
49.9
TO R50 ON
DISPLAY BD.
POLY
LIGHT
R99
GND
24.9K
.01uF
(J3-20)
-VT
GND
R119
-12V
PROC C
+VT
-VT
D
C24
-5V
R98
-5V
+VT
R118
3.3K
R66
5.1K
-5V
VEE
7
PROC A
1N4148 330K
R120
C25
OPEN
OPEN
C26
1
R114
49.9K
4
2
R94
3
7
U15B
49.9K
+12V
8
-VT
6
R100
5
10M
D16
D22
C23
1uF
TL072
0.25V/DB
240K
R93
49.9K
R102
1.0K
10.0K
U16B
R116
3
100
R101
1N4148
2
1
TL072
SHORT
49.9K
R115
49.9K
+12V
R95
3.0K
R103
1N4148
100pF
D17
-12V
U16A
R112
HI GR
8
C
1N4148
R113
49.9K
1N4148
U15A
TL072
D21
100pF
D14
4
R91
49.9K
-12V
R90
100K
+12V
-12V
-VT
OUT
CLOCK
+12V
/STEREO FAULT
100
R89
D12
1N4148
D9
1N6263
C22
+12V
BR GR
RIGHT
1.52MHz
RIGHT
R75
24.9K
3.3M
U14A
8
RIGHT LEVEL REDUCED 6dB
DURING POLARITY ERROR.
POLY (C8687-3)
Q2
2N5087
R60
3.3K
C21
.047uF
STEREO
POLARITY
ERROR
100pF
LEFT-RIGHT PHASING DETECTOR
1uF
LTC1064-1
3
+12V
R77
5
-12V
3
C17
.0027uF
1
HEAVY
TL072
2
8
D11
1N4148
-12V
U13A
2
24.9K
+5V
C20
1N4148
R62
C16A
TL072
D27
100K
NC
1uF
9
5
5
1N6123
R83
INV A
10
.006V/DB
7
R81
30K
NC
Vout
24.9K
EC+
R88
U14B
6
U10B
6
DL1
RED
R87
10K
1N4148
COMP1*
LEFT
RIGHT
+VT
C16
11
R61
300
R53
49.9
R86
100K
fCLK
AGND
R69
24.9K
7
10K
1N4148
V+
LEFT
33pF
13
12
6
R85
5.1K
R59
OPEN
R57
-12V
D29
1uF
D28
R SAMPLE
6
V-
V+
8
6
5
4
3
2
C30
R80
30K
5
D7
1N6263
R52
2.00K
100K
R56
24.9K
+12V
COMP2*
AGND
4
TL072
7
R VU
R82
4
Vin
14
8
1
3
-12V
R44
49.9K
C14
100pF
C18
R(h I)
2
1K
3
R58
100K
INV C
GND
U10A
2
8
OUT
HEADER 5X2
7
2
-12V
GND
IN
2
4
6
8
10
U11
1
4
V+
10.0K
AD622
4
R43
1uF
+5V
F
1
3
5
7
9
V-
49.9K
5
C12
R IN1
L SAMPLE
22pF
R15
V-
1
SYM
RG2
R51
6
U8
EC-
RG1
EC+
2
1
8
3
D
+12V
7
U9
THAT2180
7
1uF
R26
5.1K
R67
1.0K
C15
R42
49.9K
TL072
-12V
R70 50uS
5.62K 75uS
R10
49.9
E
R25
49.9
R27
49.9
R47
C13
100pF
24.9K
U7B
7
R28
1.0K
49.9
R46
1K
G
POLY
D1
1N6263
8
1.0K
1.52MHz
R SAMPLE
C9
2200pF
-VT
OUT
5
HD1
+12V
D6
1N4148
D1
1N6263
R35
24.9K
30K
-5V
TANT
LEFT
499
TL072
+12V
R36
FLAT
R41
3
6
TANT
R45
R IN2
R37
1
R24
R23
10K
74HC4052
C11
IN
2
C28
10uF
C10
0.1uF
6
INH
+
R20
1K
10
9
A
B
R39
47K
+7V
1
5
2
4
0Y
1Y
2Y
3Y
Y
/+12DB
/+6DB
F
12
14
15
11
+
+5V
R38
47K
U6
THAT2180
D5
1N4148
U7A
2
TL072
X
3
+VT
-12V
+12V
POLY (C8687-3)
1
5
13
C7
.0027uF
1uF
LTC1064-1
R21
300
U4B
6
U1
0X
1X
2X
3X
PE
C6
11
fCLK
AGND
24.9K
24.9K
-12V
49.9
R19
OPEN
V+
R29
V+
R7
APPROVALS
CHK
CM
33pF
13
12
5
G
V-
4
5
COMP2*
AGND
8
R16
24.9K
+12V
8
6
5
4
4
TL072
Vin
7
3
-12V
R4
49.9K
C4
100pF
3
14
R(h I)
GND
2
R18
100K
1
INV C
SYM
1K
1uF
3
4
L IN1
DWN
C8
U5
1
-12V
L SAMPLE
R3
2
C2
12
DATE
15.2 KHz LOW-PASS FILTER
(8th ORDER ELLIPTICAL)
U4A
2
8
OUT
5
AD622
IN
11
6
REVISION HISTORY
DESCRIPTION
H
V-
1
10.0K
10
REV
40Hz - 15KHz +/- 0.5dB
40H 7 5KH 0 5% THD
4
V+
R11
6
U2
RG2
GND
RG1
8
3
V-
2
1
SYM
R2
49.9K
EC+
C3
100pF
1uF
49.9K
5
Baseband:
30Hz - 53KHz +/- 0.2dB.
53KHz - 76KHz +/- 0.4dB.
V-peak
.346
1.1
3.46
SYM
U3
THAT2180
7
1K
22pF
R15
V-rms
.245
.774
2.45
EC-
R1
L IN2
+12V
9
E . C . N.
EC-
+12V
EC-
C1
7
L VU
8
TURKEY SPECIFICATIONS:
(INTO 600 ohms)
dbm
-10
0
+10
7
4
H
6
EC+
2
3
1
-VT
6
R121
5
1M
7
C
TL072
+12V
C27
1uF
R117
R122
560
1.0K
R123
+12V
C40
1uF
C42
1uF
C44
1uF
C41
1uF
C43
1uF
C45
1uF
10.0K
-12V
-12V
+VT
R127
3
B
4
Vin
NC
NC
Vout
GND TRIM
R107
4.7K
4
TEST
8
7
2
6
3
-12V
C32
.01uF
U19A
1
VCC
R128
100
NE5532
5
+5.00V
+5V
C33
1uF
+5V
C34
1uF
C35
1uF
SW1
D23
3
2
1
1N4148
NORMAL SIP3
49.9K
1
3
NE5532
5.1K
R106
6
49.9K
5
U17B
7
-VT
J1
NE5532
1
3
5
7
9
11
13
15
17
19
+12V
D24
+12V
+5V
R126
10K
1N4148
R129
6
-12V
U17A
2
R104
8
2
NC
8
+12V
NC
+12V
4
U18
REF02
1
C36
.01uF
U19B
7
5
NE5532
VSS
10.0K
R130
100
R105
10K
L IN1
L IN2
R IN1
R IN2
1
3
5
7
9
11
13
15
17
19
21
23
25
RECEPT 10X2
-5V
C37
1uF
J3
2
4
6
8
10
12
14
16
18
20
C38
1uF
2
4
6
8
10
12
14
16
18
20
22
24
26
+12V
-12V
/+6DB
/+12DB
L VU
R VU
+5.00V
PROC A
PROC B
PROC C
BR GR
HI GR
/STEREO FAULT
B
Copyright (c) 2007 HCJB Global
RECEPT 13X2
IREC
+/- 12V FOR OP-AMPS AND VCA'S.
+/- 7V AT 56mA FOR LTC 1064-1 AND LMF100.
APPROVALS
+/- 5V FOR LOGIC (+5V TAKEN FROM +5.00V BUS
+5.00V REFERENCE VOLTAGE. ALSO USED BY D
A
+/- 4.4 FOR PEAK LEVEL THRESHOLD REFERENC
UNCONTROLLED
UNLESS OTHERWISE MARKED IN RED INK BY CM AS A
CONTROLLED COPY, COPIES OF THESE DOCUMENTS
INCLUDING ASSOCIATED ELECTRONIC REPRODUCTIONS
ARE FOR REFERENCE ONLY.
1
2
3
4
5
6
7
8
THESE DRAWINGS AND SPECIFICATIONS ARE THE
PROPERTY OF INTERNATIONAL RADIO AND ELECTRONICS CORP.
AND SHALL NOT BE REPRODUCED, COPIED OR USED AS
THE BASIS FOR THE MANUFACTURE OR SALE OF APPARATUS OR
DEVICES WITHOUT PERMISSION.
DWN
CHK
DW
03-15-07
CM
DW
03-15-07
PE
DP
03-15-07
K
FILENAME:
9
10
DISTRIBUTION
INTERNATIONAL RADIO AND ELECTRONICS CORP.
25166 LEER DRIVE ELKHART, IN. 46514
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WWW.IREC1.COM
TITLE:
SIZE
A
AUDIO PROCESSOR/STEREO GENERATOR
201409F-SCH
D
SCALE :
REV
DWG . NO .
NONE
11
C
SHEET
PROJ NO.
1 OF 2
12
Schematic Diagram: Audio Processor/ Stereo Generator (Sheet 1 of 2)
6-6
1
2
3
4
DWG. NO.
REV.
5
6
7
H
0
11
6
12
H
OPEN
C203
100pF
R230
7
2
1
RG1
8
3
RG2
Composite Spec. (Turkey):
30Hz - 53KHz +/- 0.2 dBr
53KHz - 76KHz +/- 0.4dBr
U201
R206
6
AD622
3.9K
4
5
R205
OPEN
R204
49.9K
R201
1K
EXT IN+
10
+12V
C202
100pF
EXTERNAL COMPOSITE
INPUT
5
0
R203
1K
EXT IN-
9
C204
R217
SCA IN
8
-12V
R202
49.9K
C201
100pF
G
G
R207
150K
2
C206
3
+12V
-12V
-12V
+7V
+7V
-7V
-7V
F
.047uF
.047uF
POLY
POLY
R208
300K
TL072
+12V
R209
R210
4.99K
2.49K
HD201
SIP3
5
100
MON L
10.0K
RIGHT 8VPP (AT 2000Hz)
C209
3
RIGHT
-VT
.047uF
.047uF
POLY
POLY
GND
R213
300K
+12V
-12V
U203A
1
6
TL072
+12V
R214
R215
4.99K
2.49K
HD202
SIP3
U203B
7
5
TL072
R216
U204
MON R
1
100
C210
.01uF
1
2
3
4
C208
2
8
-VT
C212
150K
+VT
GND
R221
POLY
50
75
R222
10
9
C211 120pF 200K
56pF
R224
1K
6
12.4K
U205
0X
1X
X
2X
3X
0Y
1Y
2Y
3Y
Y
13
-12V
U206A
1
+12V
2
3
MC34083
3
A
B
R234
1K
INH
D207
14
DD
13
U0 OUT
12
R223
11
9.09K
2
X2
3
4
U1
Z1
Z2
10
5
U2
6
Y1 REF
9
7
Y2
8
V-
D208
1N4148
8
R254 used ONLY with AD633
AD734 has internal 50K
R237
1M
9
V+
V-
6
Z
22pF
AD633JN
304KHz
C218
12
13
CLR QA
CKA QB
QC
QD
11
10
9
8
5
4
U209B
74HC393
1
U210A
-7V
C216
1K
1
2
BPA
LPA
LPB
BPB
R252
5
R232
U206B
7
100
+5.00V
SYNC OUT
MC34083
R233
COMP OUT
D
COMP METER
R253
1K
C219
1000pF
C219
1000pF
POLY
POLY
R264
R261
+7V
R262
+12V
C224
.001
6
0.1uF
R255
1K
0.1uF
R256
+5V
R257
1K
43K
C222
1000pF
C223
1000pF
POLY
POLY
19KHz Level
5
U212B
7
Q202
MPS-A06
TL072
R263
24.9K
R258
1K
-7V
10K
10K
R260
2
10.0K
3
R265
C226
.001
-12V
U212A
1
10
Q201
MPS-A56
TL072
+12V
C
-12V
10
R259
3K
3 R243
49.9K
2
U207B
24K
20
19
5
4
3
HPA
INV BINV A
HPB
18
17
6
7
VA+
S1 A
S1 B
AGND SA/B
VA-
U210B
6 R242
120K
74HC86
6
U211
LMF100
C221
1.9MHz
74HC390
3
16
11
10
9
15
2CKA 2QB
2CKB 2QC
2QD
14
11
13
R251 49.9K
15
12
MC74HC04
U208B
2CLR 2QA
8
1.52MHz
R250 10.0K
14
6
GND
100
0.1uF
+5V
R238
10K
+7V
3.8MHz
10
1CKA 1QB
1CKB 1QC
1QD
5
6
7
13K
R244
5K
9
3
R229
R245
0.1uF
8 R241
10K
74HC86
VD+
U208A
1CLR 1QA
U210C
74HC390
U207C
MON L
MON R
12 HEADER
20K
C216
VD-
1
4
MONO/STEREO
C224
SEPARATION
CLK CLK
B
A
2
5
7
AD633 ALTERNATE TO AD 734
11 R240
24K
74HC86
R247 49.9K
12
NPO
/EXT ENABLE
U204A
-12V
U210D
R246 10.0K
13
10
C
E
J202
1
2
3
4
5
6
7
8
9
10
11
12
R231
12
MC74HC04
C215
33pF
NPO
D
13
50/100 LSH
C213
56pF
R254
49.9K
EXT IN+
EXT INSCA IN
COMP OUT
COMP METER
MONO/STEREO
/EXT ENABLE
GND
R227
1K
COMPOSITE OUTPUT
R228
3K
OUT
J201
1
2
3
4
5
6
7
8
9
10
11
12
12 HEADER
R226
U207F
2
MC74HC04
13
1
C214
5.5-18pF
12
U207A
Y201
7.6 MHz
Y1
Y2
5
1K
X1
X2
3
4
C228
1uF
1N4148
+12V
1
2
+7V
C227
1uF
+5V
AD734
R236
-7V
-5V
43K
E
F
74HC4052
V+
X1
1
5
2
4
4.99K
R220
10.0K
VEE
+VT
12
14
15
11
R219
LEFT 8VPP (AT 2000Hz)
-5V
1N4148
9.09K 1%
+5V
-5V
1N4148
D206
1N4148
R218
POLY
75
R212
-5V
1N4148
D204
1N4148
D205
R225
C207
.01uF
50
VDD
+5.00V
+5V
R211
TL072
1N4148
D203
4
+12V
8
C205
LEFT
U202B
7
8
1.52MHz
6
4
CLOCK
-12V
U202A
1
D202
8
RIGHT
RIGHT
1
2
3
LEFT
4
LEFT
D201
74HC86
4
MC74HC04
R239
10K
J203
10
9
8
7
6
5
4
3
2
1
U207E
U209A
2
1
B
CLR QA
CKA QB
QC
QD
11
3
4
5
6
10
MC74HC04
R266
38KHz
-12V
+12V
OPEN
U207D
74HC393
9
8
R267
MC74HC04
1K
19KHz
DZ1
ICTE-15
SYNC OUT
DZ2
ICTE-15
-12V
+12V
B
RECEPT 5X2
Copyright (c) 2007 HCJB Global
A
TITLE:
Copyright 2006 Michael P. Axman
UNCONTROLLED
1
2
3
4
5
6
7
8
9
SIZE
11
REV
DWG . NO .
201409F-SCH
B
SCALE :
10
A
AUDIO PROCESSOR/STEREO GENERATOR
NONE
PROJ NO.
C
SHEET 2
OF
2
12
Schematic Diagram: Audio Processor/ Stereo Generator (Sheet 2 of 2)
6-7
Illustration 6-6 Motherboard
6-8
DWG. NO.
1
2
J16 FAN
A
REV.
5
6
7
8
9
J14
-12V
+12V
RF OUT
ALC
COMPOSITE1
LOCK
/LOCK
RF_LVL
LOC/REMOTE
GND
FSK IN
-12V
NC
Vin
NC
TEMP Vout
GND
TRM
8
7
6
-12V
C28
1.0
TL072
7
U3B
/LOCK
RF_LVL
LOC/REMOTE
ALC
G
COMPOSITE1
LOCK
-12V
RF OUT
E2
E3
E4
J9
RF_LVL
V+
TEMP
GND
1
2
3
TEMP
HEADER 3X1
C159
.001
PAI
PAV
N/C
N/C
/LOCK FAULT
NC
FSK IN
NC
C158
.001
NC
J2
+5.00V
METER PATEMP
FAULT SUM
METER RFW
METER PAI
ALC
METER PAV
L IN1
L IN2
R IN1
TEMP
R IN2
PAI
PAV
LPIN L
NC
NC
R IN1
LPOUT L
DC SUPPLY
38KHZ
/CARR_OFF
LPIN R
LPOUT R
NC
Z23
/AUTO_CARR_OFF
JUMPER
NC
NC
C16
.01
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
J3
J1
NC
HEADER 10 x 2
ALC
JUMPER
C66
OPEN
C67
OPEN
C68
OPEN
C65
.01
C64
.01
JUMPER
JUMPER
C19
.01
+5.00V
PROC A
PROC B
PROC C
BR GR
HEADER 10 x 2
HI GR
NC
Z31
Z32
OPEN
OPEN
E
-12V
COMP METER
FMV CONTROL
STEREO/MON
+12V
C20
.01
TP4
+12V
COMPOSITE1
C21
.01
C22
.01
Z30
TP3
-12V
+5.00V
J7
MON L
MON R
C23
.01
NC
LPIN L
LPOUT L
LPIN R
LPOUT R
38KHZ
38KHZ
COMP METER
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
-12V
+12V
OPEN
Z15
J3
+5V
TP6
+5V
TP7
GND
-12V
1
2
3
4
5
6
7
8
9
10
11
12
RDS RX
COMP METER
STEREO/MON
REM SWR
COMPOSITE1
SCA IN
EXT RTN
EXT IN
R IN2
L IN2
L IN1
RDS TX
1
2
3
4
5
6
7
8
9
10
11
12
C
J1
INPUT CONFIGURATION CHART
NON-OMNIA BOARD INPUT IMPEDENCE
HEADER 12
COMP METER
REM LOWER
22
1
2
3
4
5
6
7
8
9
10
HEADER 5 x 2
12
10
1
2
3
4
5
6
7
8
9
10
J6
25
11
TP5
+5.00V
J8
/EXT ENABLE
R21 220
R22 220
OPEN
R23 220
Z16
OPEN
R24 220
Z17
OPEN
Z18
R25 220
OPEN
OPEN
OPEN
Z20
Z19
R26 220
R27 220
ALC
R28 220
Z22
38KHZ
Z21
OPEN
/EXT ENABLE
50 KOHM
600 OHM
Z1, Z2 ON
Z3, Z5, Z7, Z8 OFF
Z4, Z6 OFF
Z1, Z2 ON
Z3, Z5, Z7, Z8 ON
Z4, Z6 OFF
REM PWR CNTRL
9
D
+5.00V
J2
HEADER 12
D1
1N4148
OMNIA BOARD AES/EBU INPUT
Z1, Z2 OFF
Z3, Z5, Z7, Z8 OFF
Z4, Z6 ON
ANALOG LEFT/RIGHT
LEFT IN 1
LEFT IN 2
REM RAISE
-METER PAV
R4
20
-METER PAI
1K
7
-METER RFW
1K
-/AUTO_CARR_OFF
17
-/CARR OFF
4
_FSK IN
R14 220
16
_ALC
R13 100
3
-COMPOSITE OUT
R12 390
15
38 KHZ OUT
R11 390
2
-FMV CONTROL
R10 1K
14
_/EXT ENABLE
R9
C1
220pF
FSK IN
Z5
COMPOSITE METER
OPEN
38KHZ
Z3
FMV CONTROL
FMV CONTROL
220
OPEN
/EXT ENABLE
C3
220pF
C4
220pF
C14
220pF
C2
220pF
R3
R5
300
300
R7
R1
300
300
Z7
R15
1K
OPEN
R16
1K
R222
C5
.01
C6
.001
C7
C8
C9
.001 .001 .01
C10
.01
J1
XLR
A
10
9
8
7
6
5
4
3
2
1
2
3
J24
1
HD6
OPEN
3
4
5
EXT IN
OPEN
240
R32
R34 24.9K 1%
24.9K
1%
C24
1.0
TL072
1
U1A
2
R35
24.9K
1%
3
-12V
R36
24.9K
1%
UNCONTROLLED
6
UNLESS OTHERWISE SPECIFIED:
7
B
2. ALL CAPACITORS ARE IN MICROFARADS.
D3
R29
1K
R37
4.02K
1%
+12V
C25
1.0
REF. FOR
XLR CON.
HEADER 5 x 2
2
HI
LO
GND
OPEN
R20
1K
R19
OPEN
J2
OPEN
R18
1K
OPEN
Z10
Z8
+12V
DB25_2X
R17
1K
NOTES:
100
R38 1K
SCA IN
EXT RTN
R33
1. ALL RESISTORS ARE IN OHMS, 1/4W, 5% TOL.
Z14
Z11
C15
220pF
MON_R
MON_L
EXT_IN
EXT_RTN
SCA
5
Z2
JUMPER
Z1
JUMPER
OPEN
R30
6
3.9K
5
8
IREC
TL072
7
U1B
APPROVALS
1
2
3
4
5
-FAULT SUM
R31
100
Z12
C13
220pF
1
2
3
18
1K
STEREO GENERATOR SHUNT
OPEN
C12
220pF
R8
L IN2
R IN2
-METER BATT
Z13
1K
3
2
1
-METER PA TEMP
6
C11
220pF
R6
R IN1
L IN1
OPEN
R2
1K
19
Z4
1N4148
OPEN
8
D2
Z6
21
1
R VU
AUDIO PROCESSOR
STEREO GENERATOR
C18
.01
13
1
/+12DB
L VU
INSTALLED WHEN USING
AUDIO PROC. SHUNT CKT.
Z29
JUMPER
J3
B
/+6DB
Z28
JUMPER
JUMPER
23
-12V
Z27
D
24
F
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
+12V
HEADER 13 x 2
Z26
C
J12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
C17
.01
Z25
NC
C62
.01
C60
.01
C58
.01
C59
.01
C63
.001
C61
.001
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Z24
JUMPER
+12V
J10
J11
INPUT
NC
1
2
3
4
5
6
7
8
9
10
HEADER 5 x 2
C157
.001
METER BATT
DC SUPPLY
38KHZ
N/C
/CARR_OFF
TEMP
/AUTO_CARR_OFF
INPUT
N/C
N/C
N/C
N/C
N/C
N/C
ALC
1
2
3
4
5
6
7
8
9
10
1N4148
E
Z9
OPEN
100
1.0
/LOCK FAULT
J15
FM
H
WR
J28
+12V
HEADER 3X1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DP
+5.00V
R39
C30
5
5
ALC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PE
DW
J19
MCX
FM_/LOCK
1
2
3
NC
6
R177 1K
J13 FM
J29
WR
J18
MCX
+12V
R176 1K
HEADER 5 x 2
F
1
2
3
4
5
6
7
8
9
10
R150 1K
1
2
3
4
5
6
7
8
9
10
DW
REF02
/LOCK FAULT
DC SUPPLY
PAI
PAV
EXT ALC CONTROL
TEMP
FAN
V-METER
RFV
RF FWD
RF REV
INPUT
FM_/LOCK
ALC
METER PAV
METER PAI
METER RFW
METER PATEMP
METER BATT
FAULT SUM
.01
3
4
+12V
+5.00V
C140
J25
2
1.0
HEADER 5 x 2
FSK IN
1K
HEADER 3X1
V+
TEMP
GND
J26
-12V
1
2
3
1
C26
+12V
R216
FM TP1
VOLTMETER
J25
03-08-07
APPROVALS
CHK
CM
R40
4.7K
C27
.01
C29
+12V
1.0
TL072
2
1
U3A
3
U2
/LOCK FAULT
DC SUPPLY
PAI
PAV
EXT ALC CONTROL
TEMP
FAN
V-METER
RFV
RF FWD
RF REV
INPUT
.01
GND
.01
+5.00V
.01
C54
1.0
Q3
IRF541
+12V
C57
-12V
C56
FM_/LOCK
ALC
METER PAV
METER PAI
METER RFW
METER PATEMP
METER BATT
FAULT SUM
WR TP1
ANTENNA SWR
C55
DWN
+12V
RF_LVL
HEADER 6X1 .156
PRODUCTION RELEASE
DATE
AUDIO PROCESSOR SHUNT
RF EXCITER
H
1
2
3
4
5
6
12
11
6
REVISION HISTORY
DESCRIPTION
REV
A
ALC/METERING
HEADER 3
G
10
5
E . C . N.
201497F-SCH-SH3.SCH
201497F-SCH-SH2.SCH
1
2
3
FAN+12V
201207F-SCH
4
3
+12V
DWN
CHK
DW
CM
DW
10-05-06
PE
DP
10-05-06
DISTRIBUTION
K
FILENAME:
9
10
10-05-06
574-262-8900
WWW.IREC1.COM
TITLE:
SIZE
A
SCH, UNIVERSAL MOTHER BOARD
DWG . NO .
D
SCALE :
NONE
11
REV
201497F-SCH
A
PROJ NO.
SHEET 1
OF
12
Schematic Diagram: Motherboard (Sheet 1 of 3)
6-9
4
5
1.00V = 10VDC
C119
.01
R161
100K
1%
1
U19A
3
D29
1N4148
R194
15K
R195
10K
11
50mv per degree C.
R164
1M
R171 100K
METER PATEMP
R166
220K
-12V
R181
240K
METER PATEMP
3
R146
100
R184
1K
6
D33
1N4148
5
R185
200K
U22B
7
ALC
TL074
E
R155 11K
1%
R60
10K
5
1
2
2
11
1M
8
1N4148
U23C
Q7
1
2
3
4
C135
.01
TL074
8
7
6
5
Q6
1
2
3
4
1
R215
10K
4
+
R44
51.1K
10
TL074
U24C
5
TL074
R207
3.3K
R213
49.9K
1%
R66
10K SWR CAL
R67
100
C49
J26
OPEN
POWER CAL
10
8
6
4
2
-12V
+12V
NOTES:
REM PWR CNTL
R48
1K
5
10K
C51
.001
C41
.001 D11
C40
8 R47
51.1K
U4C
10
.01
C35
R70
1.15K
1%
12
+
2
C37
.01uF
VR1
LM7905
2
Vin
3
Vout
U24D
R148
100
R147
100
(1.00V at 100W)
METER RFW
J4-5
+12V
-12V
+ C126
47/20V
TL074
R208
10.0K
1%
12
14
U23D
C130
1.0
+5V
9
R56
100K
U6A
4
3
5
3
C39
.001
-12V
Vin
C133
1.0
Vout
VCC
1
D48
+12V
+5V
LM329DZ
C156
1.0
VSS
-12V
C139
1.0
C143
1.0
U8,9 pin 7
R214
3.3K
VEE
-12V
+5.00V
J3-9,10
J4-12
4
5
6
7
8
9
D10
TL074 1N4148
10
3.32K
1%
+12V
SW8
SWITCH
LOCAL ONLY
POWER SET
-6.9V
TITLE:
SIZE
NONE
A
REV
DWG . NO .
201497F-SCH
C
+5.00V
R51
1
U8A
3
RF_LVL
VR4
78L05
METER RFW
R210
1.1K
1%
8
B
SCALE :
2
U6C
74HC132
-5V
+12V
TL074
1
10
74HC132
C38
.01uf
74HC132
6
U6B
C52
1.0
3
14
100K
C34
4.7uF
TANT.
2
14
U8D
12
VDD
13
TL074
13
1
100K
74HC132
-12V
C
11
U4D
13
11 R54
U6D
13
8
U8C
D13
1N4148
74HC132
C128
1.0
13
C43
.001
TL074
9
12
74HC132
C53
1.0
-6.9V
-12V
+12V
D12
1N4148
.01
9
C33
.01uF
C_L_SHT2_A.DOT REV. A
7
U8B
5
-12V
R69
7
U10B
5
TL072
12
9
7
5
3
1
C42
.001
TL074
6
1N753A
6.2V
20pF
6
1. ALL RESISTORS ARE IN OHMS, 1/4 W, 5% TOL.
6
W
R52
8
R209
7.5K
1%
D
74HC4051
74HC132
R65
5.11K
1%
J30-19
GND
6
U4B
5
7
U24B
8
4
LM394
6
R204
22K
TANT
9
8
7
6
5
DPM IN
C160
0.1
INH
A
B
C
1
R205
10K
R203
100K
9
(.135V)
(1.999V reads "1999")
3
X
10
R202
1K
R211
49.9K 1%
LM394
-12V
D38
1N6263
SW2
SW-PB
6
11
10
9
SEL A
SEL B
SEL C
16
VCC
7
L
GND
X0
X1
X2
X3
X4
X5
X6
X7
+12V
LM394
R201
100K
1
RF FWD
.01
R172
2
U24A
TL074
C134
+12V.001
8
7
6
5
R206
39K
10
3K
D39
1N4148
1
2
3
4
3.32K
1% +5V
-12V
1N4148
D37
CS
J3-2
J3-4
J3-6
13
14
15
12
1
5
2
4
R49
1K
8
+5V
C46
Q5
2N5210
D34
U/D
H
4
GND
3
JP5
OPEN FOR FM30 UNITS
3
U9B
3
SW1
SW-PB
Q2
R59
MC33282
R200
100K
R180
J2-9
C47
.01
2
74HC132
Vcc
DS1804
49.9K
1%
7
3
U4A
2
8
7
6
5
INC
+5.00V
LM394
R61
6
R199
22K
R138
10K
MC33282
R58
10K
7
D36
1N6263
U9A
-5V
10K
C131
.001
3
.01
R179
Q1
1
2
3
4
1
1
U21
1999 WATTS
19.99
19.99V
199.9V
19.99A
199.9 Deg. C
199.9V
199.9V
U5
.01
1
2
U23B
5
3.32K
1%
2
10K
+5V
11
.01
R63
1
U10A
TL072
8
+12V C48
3
R43
51.1K
1%
R57
GND
-12V
4
2
TL074
C123
.01
RF POWER
SWR
ALC
PA DCV
PA DCI
PA TEMPERATURE
SUPPLY DC VOLTS
VOLTMETER
C32
+5V
REM LOWER
10K
R62
R139
10K
C44
.01
below 5W.)
R197
100K
D35
1N6263
TL074
C129
+12V.001
1K
6
RF POWER (RFV SQUARED)
+5V
REM RAISE
C45
+12V
ALC
R156
100K
1%
FULL SCALE
REM SWR
C50
R64 10K
R68
1
R198
22K
A
1N4148
R218 10K
R217 100K
.001V per Watt
(Clamp SWR reading
4
C124
.01
C122
10/35V
8
U22C
C153
0.1
R219
51K
LADRVR
(2.5VDC at 100W)
-12V
U23A
3
R212
2.49K
1%
J30-16
D40
R191
51K
R178 1K
2
R140
10K
DPM REF
DPM IN
HEADER 10X2
F
C155
0.1
C121
0.1
.01
11
D
R221
10.0K
1%
1
3
5
7
9
11
13
15
17
19
74HC14
J22-12
10mV/Volt
100mV/Amp
1mV/Degree C
10mV/Volt
10mV/Volt
R168
1K
1%
2
4
6
8
10
12
14
16
18
20
/LOCK FAULT
INPUT LAMP
-12V
ALL OTHERS
R174
1.1K
1%
R137
100K
1%
B
1N4148
6
METER BATT
J2-8 VOLTMETER
J2-10 RF FWD
/LOCK FAULT
SW10
SWITCH
R173
10K
1%
C
5
J2-7
TL074
C117
0.1
LOCK LAMP
D42
U25C
INPUT
1
2
3
U20B
5
E
1N4148
4
D41
1N4148
TL074
3.16K
1%
METER BATT
U25B
3
D45
INPUT
R152
100K
R189
1M
10
SEL A
SEL B
SEL C
RF_LVL
+5.00V
PATEMP LAMP
J30-18 PADC LAMP
INPUT LAMP
LOCK LAMP
J22-1 SWR LAMP
FM U5
1N4148
9
WR
R159 = 200K 1%
+5.00V
R151 120K
R188
33K
POWER SET
R192
7
C152
.001
D31
1N4148
TL074
ALL FM
R159 = 187K 1%
6
J2-11 RF REV
R55
10K
M1/M2
R159 = 19.6K 1%
R135
100K
1%
FM_/LOCK
FM_/LOCK
1
U22A
G
J30-12
J30
R220
10K
+12V
R159
*
PATEMP LAMP
D46
POWER SET
POWER SET
DC SUPPLY
R160
68.1K
1%
J23-8
FAULT SUM
+5V
J23-1
4
R158
100K
DC SUPPLY
2
74HC14
2
10mV/Deg. C
1N4148
74HC14
J2-7
R157
1M
J30-14
10 FAULT SUM
11
74HC14
1
-12V
R170
24.9K
1%
J1-2
R141 100K FAN
14
TL074
J4-6
5.00V = 100 deg. C
TL074
12
30.1K 1%
PADC LAMP
U25E
D43
C141
1.0
11
R149 100 1%
F
1N4148
12
74HC14
R190
100K
13
U20C
C120
0.1
U25F
13
R193
100K
R154 120K
U20D
J30-20
+5V
D30
1N4148
-12V
8
SWR LAMP
U25A
R169
10K
R167
10
U22D
C132
.001
1%
J2-6 TEMP OUT
C154
.001
D32
1N4148
R187
2.2M
14
TL074
+12V
R196 10K
1N4148
D44
1
U20A
3
R165
100K
J22-5
74HC14
2
R183
240K
9
D47
8
R175 120K
-12V
12
+5V
U25D
9
R186
33K
12
R182
80.6K 1%
11
H
13
R163
1.1K
1%
R136
1K
10
PAI LIMIT
TL074
G
C142
.001
9
METER PAI
TL072
R153
2.49K
1%
C118
.01
7
U19B
5
8
EXT ALC CONTROL
R144
100
6
J2-3 PAI
A
+5.00V
+ C125
47/20V
+
C127
47/20V
TL072
R162
10.0K
1%
R145
100
R142
100
2
4
J1-4
R143
100
PAV
REV.
201497F-SCH
METER PAV
1.00V = 10.0A
H
DWG. NO.
6
1.00V
3
3
2
1
2
4
1
PROJ NO.
11
A
SHEET 2
OF
3
12
6-10
1
2
3
4
5
DWG. NO.
6
REV.
201497F-SCH
A
8
9
10
11
12
88-108 MHZ
+8V
+12V
R81
150
+12V
2
1
A2
MAR-6
C79
.001
8
12
C109
1
D19
1N4148
U13
OSC in
1
2
3
Fin 4
5
6
7
8
HEADER 10
C101
100pF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
R105
100K
1%
R106 10
VDD
C103
C92
1
MC145170
11
10
U15F
74HC14
C108
3900PF
U14C
10
R114
100K
1%
MC33284P
MC33284P
R111
100K
1%
8
13
U14D
12
14
R222
1.0K
1%
C78
.01
C107
.001 POLY
R115
100K
1%
+5V
D25
1N4148
G
MAR-6
1
2
A1
RF OUT
C77
.001
C89
33pF NPO
R96
150
R95
15
R112
100
1%
C112
220pF
R79
100
1%
C90
.001
VCO1
POS-150
R113
10.0K
1%
C111
0.01
/ENABLE
DATA
R80
15
TANT.
C98
.001
C104
1 POLY
R89
100
1%
CLOCK
+5V
LOCK
C75
.001
U15E
74HC14
.001
9
R98
100K
1%
C81
.001
10/35V
13
5V_TCXO
1
2
3
4
5
6
7
8
9
10
R87 499K
1%
D15
R103
1M
R102
200K
LOCK DET.
5
NE5532
VVCO
+VDD
OUTPUT
GND
U12B
+8V
+ C91 1N4148
7
5
3
1
TO
J1 OF 201508F-PWA
FREQUENCY SELECTION PWA
LOCATED ON FRONT PANEL
+ C110
47/20V
F
F
U14B
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
U16
PIC16C61
8
SW9
RESET
4
C86
0.1
1
U11A
TL072
2
9
VU5
2
D27
1N4148
1
U14A
3
VU5
C106
1
R110
2K
2W
MC33284P
D20
1N5353B
16V
R78
10K
PWR. CNTRL TILT
R92
R85
24.3K 1%
5
4
3
2
1
SW7
OPEN
R127
25K
LF SEP.
OPEN
C102
1
DC SUPPLY
+ C114
R72
1K BECKMAN
-12V
680.0
TP1
10/35V
R93
2K
PWR. CNTRL. OFFSET
D16
D
6.2V 1N753A
TANT.
VR2
LM317
COMPOSITE1
FSK
U15A
74HC14
2
AMBER
FM
WR
3
R13210.0K 1%
+5V
DS1
GREEN
SP1
FM
SP2
10/35V
5
U15C
74HC14
DS2
RED
3
FREQ. ADJ. R101
50K
FM
R100
1
3
5
7
9
TANT.
R107
680
C
VR3
LM78L05
3
C95
.001
3
IN
OUT
1
+5V
100K 1%
C83
1
+ C82
10/35V
FSK-R
C97
.001
2
J20
HEADER 5X2
C73
.001
FSK IN
10/35V
R73
1.27K
1%
2
4
6
8
10
SP4
+ C71
TANT.
TANT.
WR
+8V
R74
237
1%
10/35V
62
8.26V
1
C
WR
Frequency Select
OUT
+ C72
R108
680
FM
U15D
74HC14
1
LOC/REMOTE
IN
+ C70
1
8
2
9
R11710.0K 1%
LOC/REMOTE
3
2
WR
1
SP3
R118 10.0K 1%
C
+12V
C
FM_/LOCK
R133 10.0K 1%
1
2
3
1.0K
1%
1
U15B
74HC14
DS3
+5V
R13410.0K 1%
4
+5V
R120
2
C69
100PF
3
COMPOSITE1
C84
0.1
TP2
4.5 - 8.0V
C88 0.1
499 1%
5
4
3
2
1
SW6
OPEN
E
R84
26.7K 1%
R124 1M
R125
68K
R94
5
4
3
2
1
SW5
OPEN
D14
3.9V
+12V
1
11
5
4
3
2
1
5
4
3
2
1
SW4
OPEN
S
G
Q4
IRFD9120 D
7
U11B
TL072
5
C94 0.1
R71
SW3
OPEN
R83
5.11K 1%
6
POLY
RP2
OPEN
D
R77
10.0K
1%
3
Z34
JUMPER
R82
5.11K 1%
-12V
R75
24.3K 1%
D21 1N4148
C113
C85
1000pF
R104
100K
1%
C116
.001 POLY
R116
100K
1%
+8V
C87
0.1
TANT.
8
R129
10.0K
1%
10/35V
R123
39
1%
D22
1N4148
+ C105
R76
30.1K 1%
RP1
OPEN
TP
18
17
16
15
14
13
12
11
10
RA1
RA0
OSC1
OSC2
VDD
RB7
RB6
RB5
RB4
R122 4.99K
RF_LVL
D26
OPEN
RA2
RA3
RTC
CLR
VSS
RB0
RB1
RB2
RB3
5
MC33284P
4
QH
CLK
QH
INH
SH/LD
SER
A
B
C
D
E
F
G
H
1
2
3
4
5
6
7
8
9
R99
100K
1%
R131
150K
R109
100K
1%
D23
1N4148
2
7
VDD
R119
10.0K
1%
LOAD
DATA
CLK
E
6
7
9
+5V
2
15
1
U18
OPEN
10
11
12
13
14
3
4
5
6
9
QH
10
11
12
13
14
3
4
5
6
D28
OPEN
2
15
1
10
8
6
4
2
SER
A
B
C
D
E
F
G
H
9
7
5
3
1
CLK
QH
INH
SH/LD
J20
OPEN
7
TANT.
U17
OPEN
1
G
CV
7
J31
14
7
R88
100
1%
C74
.001
Y1
1
3
4
FM_/LOCK
+5V
6
U12A
NE5532
H
C99
1
R86
499K
1%
2
8
6
4
2
FSK-R
3
VU5
FM_/LOCK
+5V
+5V
R97
OPEN 1
VU5
3
H
8
C80
100PF
TANT.
+12V
FSK IN
C76
.001
D24
1N4148
R224
10K
CH. SEL.
B
VU5
OFFSET 1N6263
FREQ. ADJ.
BAND LIMIT
DIRECT FSK
R
NOT USED
D17
AUTO ID
B
ID
RF_LVL
TITLE:
A
SIZE
201497F-SCH
C
SCALE :
1
2
3
4
5
6
7
8
9
10
NONE
A
REV
DWG . NO .
PROJ NO.
11
A
SHEET 3
OF
3
12
6-11
1
E . C . N.
2
3
REVISION HISTORY
DESCRIPTION
REV
PRODUCTION RELEASE
A
4
DATE
DWN
03-08-07
DW
APPROVALS
CHK
CM
DW
PE
DP
F
F
Illustration 6-7 FM Frequency Selection Board (Top-Side)
7
CLK
QH
INH
SH/LD
1
2
3
4
5
6
7
8
9
10
RP1
100K RPACK
D
10
9
8
7
6
5
4
3
2
1
D
HEADER 5 x 2
10
9
8
7
6
5
4
3
2
1
Illustration 6-8 FM Frequency Selection Board (Bottom-Side)
REV.
J1
D1
1N4148
DWG. NO.
9
QH
SER
A
B
C
D
E
F
G
H
10
11
12
13
14
3
4
5
6
+5V
2
15
1
7
CLK
QH
INH
SH/LD
QH
SER
A
B
C
D
E
F
G
H
10
11
12
13
14
3
4
5
6
U2
74HC165
2
15
1
U1
74HC165
9
E
E
RP2
100K RPACK
C
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
C
SW2
SW3
SW4
SW5
SW1
B
B
UNLESS OTHERWISE MARKED IN RED INK
BY CM AS A CONTROLLED COPY, COPIES
OF THESE DOCUMENTS INCLUDING
ASSOCIATED ELECTRONIC REPRODUCTIONS
A
THESE DRAWINGS AND SPECIFICATIONS
ARE THE PROPERTY OF INTERNATIONAL
RADIO AND ELECTRONICS CORP. AND
SHALL NOT BE REPRODUCED, COPIED OR
USED AS THE BASIS FOR THE
MANUFACTURE OR SALE OF APPARATUS
OR DEVICES WITHOUT PERMISSION.
A_P_SHT1_A.DOT REV. A
1
IREC
APPROVALS
UNCONTROLLED
DWN
CHK
DW
11-14-06
CM
DW
11-14-06
PE
DP
11-14-06
DISTRIBUTION
574-262-8900
WWW.IREC1.COM
TITLE:
SIZE
SCH, FM FREQUENCY SELECTION
DWG . NO .
FILENAME:
SCALE :
2
REV
201508F-SCH
A
NONE
A
PROJ NO. 551
SHEET 1
3
OF
4
Schematic Diagram: FM Frequency Selection
6-12
A
Illustration 6-9 FM Display Board
6-13
3
4
5
DWG. NO.
6
REV.
Q43113-2F
H
8
9
9
+12V
4
R1
68K
L VU
U1A
D1
1N4148
R3
1K
1
6
5.00V
5
C2
1.0UF
D2
1N4148
8
+12V
7
4
3
+12V
2
1
RADJ
L9
ROUT
L8
DHI
L7
IN
L6
DLO
L5
V+
L4
V-
L3
L1
L2
10
RED
11
11
YEL
12
GRN
13
GRN
14
GRN
15
GRN
16
GRN
17
GRN
18
GRN
12
+5V
13
DL21-25
14
Y
G
50mA
15
16
G
G
17
18
L10 MODE
L9
RADJ
L8
ROUT
L7
DHI
L6
IN
L5
DLO
L4
V+
L3
V-
L2
L1
REV
11
12
APPROVALS
CHK
CM
DATE
DWN
336
G
REDRAWN ON IREC FORMAT AND PWB CHG. TO REV. C
09-20-04
DW
DW
475
H
PWA, PWB CHG'D TO ROHS
07-24-06
DW
DW
PE
9
H
8
7
6
R14 1.2K
C5
.001
R13
1K
5.00V
5
HI GR
3
C1
1.0UF
-12V
TL072
2
10
MODE L10
8
R4
1.2K
U4
LM3914
DL1-10
10
REVISION HISTORY
DESCRIPTION
4
3
+5V
R30
150
+12V
2
+5V
C6
0.1
1
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
R2
100K
H
E . C . N.
U2
LM3915
2
1
JP1
OPEN
3
2
16
1
C3
1.0
R9
1K
TL072
6
U1B
5
7
6
5
F
4
3
+12V
2
ROUT
L8
DHI
L7
IN
L6
DLO
L5
V+
L4
V-
1
GRN
13
GRN
Y
12
G
14
GRN 50mA
15
GRN
16
GRN
13
G
14
G
15
G
16
G
GRN
18
L2
11
YEL
12
17
L3
L1
RED
11
L9
10
RED
17
G
GRN
18
L10 MODE
L9
RADJ
L8
ROUT
L7
DHI
L6
IN
L5
DLO
L4
V+
L3
V-
L2
L1
6
R18 1.2K
R17
1K
5.00V
5
4
3
C8
.001
+12V
1
19.99
ALC
19.99
U12
ICL7107
VEE
GND
7
8
GRN
GRN
F
GRN
GRN
GRN
SUPPLY DC VOLTS 199.9
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Y
GRN
VOLTMETER 19.99
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Q2
MPS-A56
R11
1K
EN
A
B
C
GRN
PA TEMPERATURE 199.9
Y
R12
330
RED
SWR
PA DC AMPS 19.99
+5V
G
GRN
PA DC VOLTS 199.9
2
U11
74HC4051
DECIMAL POINT
DL36-43
F.S.
RF POWER 1999
C7
0.1
8
X
VCC
DP10
DP100
9
7
R56
220
+5V
6
11
10
9
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
+5V
BR GR
C4
1.0
D4
1N4148
UNITS
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
RADJ
7
5.00V
10
R16
33K
U5
LM3914
DL11-20
MODE L10
8
D3
1N4148
R7
68K
TENS
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
9
+12V
R10
1.2K
R VU
100'S
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
R8
100K
MOD. CAL.
DL26-35
U3
LM3915
2
1
JP2
OPEN
DITHER
X0
X1
X2
X3
X4
X5
X6
X7
1000
Q1
MPS-A56
R5
1K
13
14
15
12
1
5
2
4
R15
33K
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
R6
330
RED
G
DL101
DISPLAY
G
R36
100K
4
C13
.01
-12V
TL072
1
U6A
3
R33
33K
R32
620
8
+12V
6
D16
1N4148
2
E
R31
5.6K
D17
DITHER
10V P-P DITHER
7
U6B
5
R51 DZ1
2.2K 6.2V
TL072
R38
100K
R37
470K
C27
1.0UF
C14
0.1
E
1N4148
R34
5.1K
-12V
C25
0.1
C16
0.1
DOWN
R54
1K
SW6
R26
33K
D5
1N6263
C17
0.1
C18
0.1
C19
100PF
C21
.01
+5V
3
R40
100K
COMPOSITE
R42
10K
C33
.001
4
U9B
U10
74HC14
14
5
4
11
15
1
10
9
+5V
+12V
4
C26
1.0UF
D6
1N6263
-12V
2
R46
10M
+12V
9
8
8
R27 2.7K
TL072
6
Q3
2N5210
7
U7B
5
-12V
2
D7
3
1N4148
R24
1M
R43
3.3M
D18
C10
0.1
C12
.001
TL072
1
U13A
R47
1K
7
5.00V
6
5
R48 1K
4
+12V
+12V
R25
10K
3
2
C
1
R49
10K
+5V
DL48-58
U8
LM3914
1N4148
-12V
R53
1K
+12V
C11
0.1
R28
1K
SW5
JUMPER FOR BAR
JP3
TL072
7
U13B
4
TL072
6
5
R44
33K
1
U7A
3
UP
Q4
2N5087
R45
100
2
D
1
R23
10.0K
1%
8
R22
10.0K
1%
R35
100K
C15
0.1
MODE L10
RADJ
L9
ROUT
L8
DHI
L7
IN
L6
DLO
L5
V+
L4
V-
L3
L1
L2
"110"
10
R52 5.6K
1
R39
100K
C28
2
U9A
R41
10K
C32
.001
DL44-47, 59
PA TEMP
YEL
12
GRN
13
GRN
14
GRN
15
GRN
16
GRN
17
GRN
18
CO
BO
QA
QB
QC
QD
12
13
3
2
6
7
D
74HC193
74HC14
1.0UF
RED
11
C20
.01
CLR
UP
DOWN
LOAD
A
B
C
D
5.00V
5.00V
J2
DL59 RED
SEL A
SEL B
SEL C
RF LEVEL
5.00V
PATEMP LAMP
PADC LAMP
INPUT
LOCK LAMP
SWR LAMP
PA DC
DL47 RED
13
U9F
R19
510
12
DL46 RED
74HC14
R50
100K BECKMAN
GRN
GRN
INPUT
+12V
LOCK
R20
220K
C9
1.0UF
-12V
5.00V
DL45 RED
SW3
DPDT
DPM REF
DPM IN
+12V
C
-12V
5.00V
Pin 1, upper left from front of unit.
2
4
6
8
10
12
14
16
18
20
L VU
R VU
DL44 RED
5.00V
PROC A
PROC B
PROC C
BR GR
HI GR
STEREO
+5V
MONO
1
3
5
7
9
11
13
15
17
19
+12V
-12V
/+12DB
/+6DB
5.00V
COMPOSITE
MON/ST
HEADER 10X2
COMPOSITE
R VU
L VU
B
5.00V
HEADER 10X2
+12V
-12V
SWR
R29
680
"PILOT"
GRN
1
3
5
7
9
11
13
15
17
19
J1
MOD. CAL.
R55
4.7K
2
4
6
8
10
12
14
16
18
20
SW1
DPDT
+12V
/+6DB
B
+12V
5.00V
C31
1.0UF
5
VR1
7805
Vin
GND
1
C24
1.0UF
C29
1.0UF
14
6
U9C
SW2
DPDT
R57
C34
1.0UF
/+12DB
74HC14
9
U10
U11
8
U9D
R58
0
74HC14
7
APPROVALS
8
C22
1.0UF
VEE
VSS
C30
1.0UF
-12V
11
10
U9E
74HC14
-12V
A
UNCONTROLLED
NOTES : UNLESS OTHERWISE SPECIFIED:
1
2
PROPERTY OF INTERNATIONAL RADIO CORP.
IREC
1K BECKMAN
16
U9
2
C23
1.0UF
Vout
VDD
VCC
+5V
3
3
4
5
6
7
8
DWN
CHK
CM
PE
K
DW
TITLE:
DISTRIBUTION
FILENAME:
9
574-262-8900
WWW.IREC1.COM
09-20-04
SIZE
SCH, FM/IBOC DISPLAY
DWG . NO .
C
SCALE :
10
NONE
A
REV
Q43113-2F
PROJ NO.
11
H
OF
SHEET
12
Schematic Diagram: FM Display
6-14
Illustration 6-10 Driver Switch Logic Board
6-15
1
2
3
4
5
REV.
DWG. NO.
6
8
9
E . C . N.
C35
11
REV
12
DATE
APPROVALS
CHK
CM
DWN
PE
+
+12V
10
REVISION HISTORY
DESCRIPTION
A
J1
1
2
3
4
5
6
H
ADDED R67, TP11 & PRODUCTION RELEASE
01-14-08
DW
DW
MS
10/35V
TANT
H
CARR SW
+5V
C2
R1
4.7K
C1
0.1
-12V
0.1
14
R2
10.0K
/CARRIER OFF
U1C
5
6
R3
4.7K
74HC14
C3
+5V
14
7
0.1
U2A
2
1
G
+5V
7
74HC02
+5V
U1B
4
DS3
RED
TIMER
ENABLE
DS4
GREEN
TIMER
RESET
COMP2
12
C15
0.1
RST
/LOCK FAULT
GS1G-TP
J2
2
4
6
8
10
12
14
16
18
20
D
R16
75.0K
1%
7
5
PAI
GND
2
4
6
8
10
5
4
6
1
3
5
7
9
TP3
DRVR +24V
74HC02
1%
R28
24.9K
1%
C17
1.0
POLY
+24V
C4
6
G
5
LM2904
FB1
R29
23.2K
1%
0.1
1%
D7
GS1G-TP
+1.8V
U9A
2
N/C
OPEN
FASTON
8
OUT
C28
0.1
-12V
3
1%
Z1
Solder Jumper
7
12
Z2
Solder Jumper
U10B
LM2904
3
0.01
R42
R56
499
1%
OPEN
C24
33
TP9
10K
ALC
PSU2
0-6V
R41
OPEN
13
C39
-12V
74HC14
APPROVALS
8
11
10
Solder Jumper
74HC14
74HC14
DWN
CHK
CM
PE
DW
10-30-07
DW
10-30-07
T HESE DRAWINGS AND SPECIFICAT IONS ARE T HE
MS
10-30-07
PROPERT Y OF INT ERNAT IONAL RADIO CORP.
UNLESS OT HERWISE MARKED IN RED INK BY CM AS A
DISTRIBUTION
CONT ROLLED COPY, COPIES OF T HESE DOCUMENT S
T HE BASIS FOR T HE MANUFACT URE OR SALE OF APPARAT US OR
INCLUDING ASSOCIAT ED ELECT RONIC REPRODUCT IONS DEVICES WIT HOUT PERMISSION.
K
FILENAME:
Z4
Z6
Solder Jumper
5
6
7
C38
10/35V
TANT
12 HEADER
B
IR E C
12
Solder Jumper
0.1
U11E
UNCONTROLLED
7
+
-12V
Z9
+5V
Z8
Solder Jumper
C37
0.01
TP1
-12V
TP10
GND
POWER FROM
PSU1
U11F
-12V
OPEN
C25
OPEN
9
R44
U9B
LM2903 3K
R43
OPEN
U11D
6
4
R39
OPEN
R40
+5V
7
6
74HC02
R37
OPEN
TP8
Z7
Z5
Solder Jumper
5
Solder Jumper
2
TO
RF PA2
12
11
10
9
8
7
6
5
4
3
2
1
ALC VOLTAGE
CONTROL
TO PSU2/DRVR
C26
3
LM2904
13
FASTON TAB
J5
Header 4
C23
OPEN
1
PA2 CURRENT
C33
0.01
5
Z3
Solder Jumper
5
U2D
11
1.50K
1%
6
R66
24.9K
1%
NOTES:
R54
75.0K 1%
U8B
U7
HV7801
OUT
100 V
R55
10K
1
2
3
4
C
+5V
J6
ALCPSU2
U10A
2
C34
0.01
100V
R53
4.99K
5
10 0V
LOAD
IN
C32
0.01
4
C31
.1
N/C
GND
2
+12V
R36
OPEN
P4
R65
+VPA DC IN
A
C30
0.01
TP4
+24V
+24V
TP6
+5V
PSU2 VOLTAGE SCALING
OPEN
GRN
VPAOK
+12V
TP2
+12V
TP5
GND
D9
R38
R50
499
1%
+5V
750
74HC14
C20
10/6.3V
OPEN
+VPA2
0.1
FASTON
JP2
PA1 CURRENT
1.50K
1%
R47
4.99K
1%
R52
10K
C41
+30-6 0V
FROM PSU2
P2
3
R35
2
56K
C22
0.01
TP7
R51
.02 5W
+VPA DC IN
P1
R48
1
D
1/50V
DS8
U11A
1
R33
1
1
2
3
1%
+
8
R62
OPEN
1%
R31
511
TO
RF PA1
OPEN
U8A
LM2904
2
5
4
R61
OPEN
0.1
U6
HV7801
R49
10K
C29
0.01
100V
D8
GS1G-TP
C19
0.01
C18
47/16V
4
2
4
1
2
GND
TO
FAN
J3
LOAD
IN
3
1
0.1
FASTON TAB
75.0K 1%
C27 +12V
R64
24.9K
1%
+
R30
2.15K
+VPA1
R46
10K
C40
FB2
VPAOK
LM2903
R63
0.01
R34
3K
1
3
P3
.02 5W
+12V
C6
R11
470
4
R45
C36
.01
+5V
3
(30 - 60 V)
ALC FLTRD
C21
R32
909
+5V
+VPA
U11B
74HC14
+
C5
GS1G-TP
8
F2 1/4 AMP
+5V
Q1
MMBT8099
74HC02
4
+5V
PA2I 100 mV/AMP
FAN
D6
10
PA1I 100 mV/AMP
1
TANT
Q2
IRFR5410
U2C
9
PA CURRENT MONITOR
B
D
R9
1.0K
(AUDIO)
ALC
J4
4.7/50V
S
7
PSU2 VOLTAGE MONITOR
HEADER 2
+24V
R10
910
8
PAV
C
E
R27
10.0K
HEADER 10 X2
R12
10K
DRIVER SWITCH
U1E
74HC14
+5V
U4B
OPEN
INPUT FAULT
-12V
U2B
HEADER 5X2
10
COUT
R26
10.0K
R57
2.49K
(TOTAL)
0.5 MIN
2 MIN
4 MIN
8 MIN
9
COUT
R25
100K
C13
1.0
POLY
R19
1.0M
CIN
TP11
AF FLTR
LM2904
C12
.001
1
3
5
7
9
11
13
15
17
19
R67
10K
+12V
U1F
74HC14
TIME-OUT SELECT
JP1
8
SUPPLY METER/VCO DC
D10
R18
100K
R7
750
+5V
74HC14
7
5
4
6
14
13
15
1
2
3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q12
Q13
Q14
R24
10.0K
11
D3
1N6263W
U3B
6
R6
820
DS6
GRN
8
U5
74HC4060
F1 1/4 AMP
E
RF DRIVE
ON
DS5
GRN
12
D4
R23
MMBD4148 10.0K
C16
0.1
-12V
0.1
AUDIO
FAIL
DS7
GRN
F
3
R21
220.0
U1D
9
+5V
1
C11
-12V
C14
0.1
U4A
LM2904
4
R14
5.1K
1%
C7
.01
D5
MMBD4148
R22
2.2K
16
8
2
R17
51K
3
4
/CARRIER OFF
D2
1N6263W
1
AUDIO or COMPOSITE
/AUTO CARRIER
+12V
8
C9
.001
R20
100K
VCC
R8
1.0K
DS1
GRN
AUDIO FAIL TIMER
+12V
PROGRAM AUDIO DETECTION
F
DS2
RED
R60
2.4K
+
D1
MMBD4148
74HC14
C10
R15 +12V
0.1
75.0K
1%
U3A
LM2904
2
-12V
R59
2.4K
13
74HC14
+12V
R58
750
11
3
10
2
INPUT FAULT
U1A
1
R5
10.0K
6
R4
4.7K
+24V
+5V
U11C
74HC14
/AUTO CARRIER
C8
.001
R13
90.9K 1%
G
+5V
5
3
8
9
IN T E R N A T IO N A L R A D IO A N D E L E C T R O N IC S C O R P .
2 5 16 6 L E E R D R IVE E L K H A R T , IN . 4 6 5 14
5 74 - 2 6 2 - 8 9 0 0
WWW.IR E C 1.C O M
TITLE:
SIZE
C
SCALE :
10
SCH, DRIVE SWITCH LOGIC
DWG . NO .
NONE
A
REV
201574F-SCH
PROJ NO.
11
A
OF
SHEET 1
1
12
C _L_SH T1_A .D O T R EV . A
Schematic Diagram: Driver Switch Logic Board
6-16
R19
Illustration 6-12 FM600 Power Amplifier Module
6-17
1
2
3
4
5
6
E . C . N.
REV
A
7
REVISION HISTORY
DESCRIPTION
PRODUCTION RELEASE
8
DATE
DWN
02-20-07
DW
APPROVALS
CHK
CM
DW
PE
DP
F
F
E
C10
.01
R10
12K
R11
10K
L22
50NH
3
R12
5.6
R16
10, 1/8W
LB01
R13
5.6
C13
.01
C12
.01
J01
BEAD
BNC RECEPT
Q01
SD2942
C16B
6.5-30pF
G2
3W
C01
.01
C16A
10PF
R17
24, 3W
G1
C14
.01
R14
5.6
C
C25
55pF
T21
D2
J02
BNC RECEPT.
S
T11S
T1111P
REV.
2
C11
.01
R19
200
C22
0.1
C21
.01
15K
1
DZ10
6.2V
E
PA DC
DWG. NO.
R18
2.7K
D
L21
50NH
R01
C23
.01
D1
C24
.68
C26
.01
C15
.01
NOTES:
R15
5.6
C
PA INPUT
1. ALL RESISTORS ARE IN OHMS, 1/4W, +/- 5% TOL.
PA OUTPUT
3. C10 - C15 = .01 CHIP
4. L21 AND L22 = 8 TURNS CLOSE-WOUND, 3/16 INCH I.D.
B
B
IREC
APPROVALS
UNCONTROLLED
A
B_L_SHT1_A.DOT REV. A
1
2
3
THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF
AND ARE NOT TO BE REPRODUCED, COPIED OR USED AS THE BASIS
FOR THE MANUFACTURE OR SALE OF APPARATUS OR
4
DWN
CHK
CM
PE
DW
574-262-8900
WWW.IREC1.COM
02-20-07
DW
02-20-07
DP
02-20-07
DISTRIBUTION
TITLE:
SIZE
FM RF AMPLIFIER
201551F-SCH
B
FILENAME:
5
REV.
DWG . NO .
SCALE : NONE
6
7
A
A
SHEET 1
PROJ NO.
8
Schematic Diagram: FM RF Amplifier
6-18
Illustration 6-13 FM Low Pass Filter #2
6-19
1
EP
2
3
4
5
6
E . C . N.
7
REVISION HISTORY
DESCRIPTION
REV
REDRAWN
J
8
DATE
DWN
12-05-03
DW
APPROVALS
CHK
CM
PE
DP
F
F
E
E
C11
47pF NPO
SHIELD
C4
7.1pF
C6
9.3pF
C8
5.13pF
R3
10
R2
73.2
REV.
C2
1.35pF
J1
RF IN
RF OUT
L4
87.5nH
L5
77.9nH
J2
BNC
R4
10
D
L1
OPEN
C1A
10pF
C17
3.5pF
C1
15.4pF
C3
40.9pF
C5
38.9pF
C7
37.7pF
C9
14.1pF
C10
2pF
D1
R5
73.2
R6
1K
1N6263
FWD
R9
1K
REFL
C19
47pF
C1-C10 AND C17
ARE PWB COPPER AREAS
C13
0.001uF
C12
47pF NPO
D2
1N6263
DWG. NO.
L3
94.1nH
L2
90.5nH
R7
20K
C14
0.01uF
C15
.01
R8
20K
C16
0.001uF
HD1
R1
100
C18
47pF
Aprox. 7V RMS
with 200w RF in
R10
RF MONITOR
10K
D3
1N6263
C
RFV
R11
100K
C20
.01
5
4
3
2
1
1
2
3
C
HD2
1X5
NOTES:
=======
UNLESS OTHERWISE SPECIFIED
1) ALL RESTORS ARE IN OHMS, 1/4W, 5%
B
2) ALL CAPACITORS ARE IN MICROFARADS
B
IREC
3) C1-C10 AND C17 ARE CIRCUIT BOARD PADS
4) IF NECESSARY, SELECT R2 FOR SWR READING OF
1.1 OR BETTER WITH 50 OHM LOAD R5 = R2
UNCONTROLLED
A
APPROVALS
1
2
3
4
5
DWN
CHK
CM
PE
DW
574-262-8900
WWW.IREC1.COM
03-14-02
TITLE:
DISTRIBUTION
SIZE
FM LOW PASS FILTER #2
DWG . NO .
B
FILENAME:
REV.
103209-SCH
SCALE : NONE
6
7
A
J
SHEET
PROJ NO.
8
Schematic Diagram: FM Low Pass Filter #2
6-20
Illustration 6-14 FM RF Driver
6-21
2
3
4
5
E . C . N.
REV
264
M
ADDED TO PWB (200922-PWB-D IN LOCATION
SHOWN, AND DEPICTED ON COMPONENT MAP.
C23
C24
.01
7
DATE
DWN
PRODUCTION RELEASE
12-10-03
DW
DW
DP
OPEN
XU1
MHW6342T
C4
OPEN
279
N
XU1 WAS 200479-TERM-10
01-29-04
DW
DW
MH
316
O
PWB CHG'D TO REV. C
06-14-04
DW
DW
DP
361
P
PWB CHG'D TO REV. D
03-22-05
DW
DW
DP
475
Q
PWA & PWB NOW RoHS.
07-28-06
DW
DW
DP
R18
C7
0.01
OPEN
0
D1
OPEN
1
2
3
4
5
6
7
8
9
D2
OPEN
3
2
1
1
R2
2
R1
OPEN
R3
OPEN
R6
OPEN
C3
.01
R17
51
VR1
OPEN
1
Vout
GND
Vin
E
L2
OPEN
L1
33uH
3 +5V
C10
10pF
L3
C11
36pF
C12
36pF
C13
5pF
C14
27pF
C6
0.01
C22
OPEN
C21
OPEN
C9
OPEN
FOR FM30:
20VDC INPUT APPLIED HERE.
FOR FM100 AND FM250: 18V
C18
OPEN
FOR FM500: 20V
R16
OPEN
2
D
D
G
3
OPEN
C2
OPEN
T1
J2
RF OUT
S
R4
OPEN
C5
22
C15
680pF
L5
23.2uH
Q
.01
L4
10.4uH
Q1
BLF245
REV.
E
F
C8
OPEN
R7
IN
GND
GND
N/C
VCC
N/C
GND
GND
OUT
L6
OPEN
C1
PE
.01
R5
J1
RF IN
8
APPROVALS
CHK
CM
Q43310-4F
F
6
REVISION HISTORY
DESCRIPTION
R8
*
FOR FM30: FEED POINT FROM PWR. REGULATOR PWB.
DWG. NO.
1
+24VDC
J3
1
L7
OPEN
R11
4.7K
R12
R9
51
1/2W
C
D3
1N753A
6.2V
C20
OPEN
RT1
T
2.7K NTC
OPEN
R13
OPEN
C17
0.01
C
8
C16
0.01
OPEN
R10
10K
J4
U2A
3
1
U2B
5
1
2
OPEN
OPEN
NOTE:
4
C19
OPEN
7
6
B
B
1. ALL RESISTORS ARE IN OHMS, 1/4 WATT +/- 5% TOL.
R8 POWER LEVEL CONFIGURATION
R14
FM30
OPEN
OPEN
FM100
FM250
IREC
FM500
3 OHM 5W 3 OHM 5W 2.7 OHM 5W
R15
OPEN
APPROVALS
DWN
CHK
CM
PE
J5
1
UNCONTROLLED
A
1
2
3
4
DW
08-28-03
DW
10-30-03
DP
10-30-03
DISTRIBUTION
574-262-8900
WWW.IREC1.COM
TITLE:
SIZE
SCH, FM RF DRIVER
DWG . NO .
B
FILENAME:
5
SCALE : NONE
6
7
REV.
Q43310-4F
PROJ NO. 533
A
Q
SHEET
8
Schematic Diagram: FM RF Driver
6-22
1
2
3
4
5
REV.
DWG. NO.
6
8
9
E . C . N.
10
11
REVISION HISTORY
DESCRIPTION
PRODUCTION RELEASE
REV
A
12
DATE
02-13-08
DWN
DW
APPROVALS
CHK
CM
PE
MOTHERBOARD
201506F-PWA
10 CONDUCTOR
RIBBON
J1
H
J31
H
FREQUENCY
SELECTION
201508F-PWA
J19
J30
J15
J14
REFLECTOMETER
FEED-THRU
Q43464-9
20 CONDUCTOR
RIBBON
20 CONDUCTOR
RIBBON
12345
GND
TEMP
+12V
J5
20 CONDUCTOR
RIBBON
F
DRIVER SWITCH
LOGIC BOARD
201574F-PWA
DISPLAY
Q43113-2-PWA
J1
J2
654321
J1
12
11
10
9
8
7
6
5
4
3
2
1
+12V
+12V
GND
GND
+5V
+5V
N/C
KEY
+24V
GND
-12V
N/C
J2
J12
123
G
J25
J13
G
YELLOW
YELLOW
BLACK
BLACK
RED
RED
F
ORANGE
BLACK
BLUE
J6
4
3
2
1
ALCPSU2
GND
GND
ALC FLTRD
J1
BACK VIEW
HD2
E
RF OUT
1
2
RF IN
P1
RF OUTPUT
FILTER
Q43301-3
DRIVER INPUT
BNC
4
5
6
8
9
HD1
12
13
14
15
PA1 DC INPUT
DRIVER DCINPUT
INNER FAN
ALC
OUTER FAN
RF MONITOR
22
23
24
25
PA2 DC INPUT
D
17
18
19
20
28
29
P2
PA RF OUTPUT
BNC
31
32
33
35
36
1
2
37
38
4
5
6
40
41
42
8
9
44
45
46
47
37
38
40
41
42
TO
RF PA2
FAN
P3
P4
J3
+VPA DC IN
FROM PSU2
P1
E
P2
44
45
46
47
12
13
14
15
17
18
19
20
TO
RF PA1
HEADER
DC BUS
52
53
54
55
56
57
52
53
54
55
56
57
22
23
24
25
DC BUS
SOCKET
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
EARTH
D
28
29
62
63
64
65
31
32
33
67
68
69
35
36
71
72
62
63
64
65
OUTPUT
67
68
69
CARRIER
HIGH VOLTAGE
POWER SUPPLY
201660F-PS
ON
71
72
72PINB
OFF
J1 G N H
AC POWER
C
C
ON
1
OFF
FILTER
120/240 VAC
50/60HZ
B
HOT
3
J2
+24V
KEY
-12V
N/C
+12V
+12V
N/C
GND
GND
GND
LOW VOLTAGE
POWER SUPPLY
201661-PS
FUSE
H
12 AMP
GND
2
+5V
+5V
EARTH
13
12
11
10
9
8
7
6
5
4
3
2
1
ORANGE
BLUE
YELLOW
YELLOW
BLACK
BLACK
BLACK
RED
RED
B
N
NEUTRAL
201512F-PEM
IR E C
EARTH
APPROVALS
A
DWN
CHK
CM
PE
UNCONTROLLED
DW
T HESE DRAW INGS AND SPECIFICAT IONS ARE T HE
PROPERT Y OF INT ERNAT IONAL RADIO CORP.
UNLESS OT HERWISE MARKED IN RED INK BY CM AS A
DISTRIBUTION
CONT ROLLED COPY, COPIES OF T HESE DOCUMENT S
T HE BASIS FOR T HE MANUFACT URE OR SALE OF APPARAT US OR
INCLUDING ASSOCIAT ED ELECT RONIC REPRODUCT IONS DEVICES W IT HOUT PERMISSION.
K
FILENAME:
1
2
3
4
5
6
7
8
9
IN T E R N A T IO N A L R A D IO A N D E L E C T R O N IC S C O R P .
2 5 16 6 L E E R D R IV E E L K H A R T , IN . 4 6 5 14
5 74 - 2 6 2 - 8 9 0 0
WWW.IR E C 1.C O M
02-13-08
TITLE:
SIZE
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SCALE :
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SCH, FM600 INTERCONNECT
A
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REV
201678-SCH
NONE
PROJ NO.
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SHEET
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Schematic Diagram: FM600 Chassis Interconnect
6-23
Section 7—Service and Support
We understand that you may need various levels of support or that the
product could require servicing at some point in time. This section provides information for both of these scenarios.
Service and Support
7-1
7.1 Service
The product warranty (see opposite page) outlines our responsibility for defective products.
Before returning a product for repair or replacement (our choice), call our Customer Service
department using the following telephone number:
(866) 262-8917
Our Customer Service Representative will give you further instructions regarding the return
of your product. Use the original shipping carton or a new one obtained from Crown. Place
shipping spacers between the slide-out power amplifier assembly and the back panel.
Please fill out the Factory Service Instructions sheet (page 7–5) and include it with your returned product.
7.2 24–Hour Support
In most instances, what you need to know about your product can be found in this manual.
There are times when you may need more in-depth information or even emergency-type
information. We provide 24–hour technical assistance on your product via a toll telephone
call. For emergency help or detailed technical assistance, call
(866) 262-8917
You may be required to leave a message at this number but your call will be returned
promptly from our on-call technician.
7.3 Spare Parts
To obtain spare parts, call Crown Broadcast Service at the following number.
(866) 262-8917
You may also write to the following address:
25166 Leer Drive
Elkhart, Indiana, U.S.A. 46514-5425
7-2
Crown Broadcast Five Year Limited Product Warranty
Summary Of Warranty
Crown Broadcast IREC warrants its broadcast products to the ORIGINAL PURCHASER of a NEW
Crown Broadcast product, for a period of five (5) years after shipment from Crown Broadcast. All
products are warranted to be free of defects in materials and workmanship and meet or exceed all
specifications published by Crown Broadcast. Product nameplate with serial number must be intact
and not altered in any way. This warranty is non - transferable. This warranty in its entirety is the
only warranty offered by Crown Broadcast. No other warranties, expressed or implied, will be enforceable.
Exclusions
Crown Broadcast will not warranty the product due to misuse, accident, neglect and improper installation or operation. Proper installation included A/C line surge suppression, lightning protection and
proper grounding of the entire transmitter, and any other recommendations designated in the Instruction manual. This warranty does not extend to any other products other than those designed and
manufactured by Crown Broadcast. This warranty does not cover any damage to any accessory
such as loads, transmission line or antennas resulting from the use or failure of a Crown Broadcast
transmitter. Warranty does not cover any loss of revenue resulting from any failure of a Crown
Broadcast product, act of God, or natural disaster.
Procedure for Obtaining Warranty Service
Crown Broadcast will repair or service, at our discretion, any product failure as a result of normal intended use. Warranty repair can only be performed at our plant facility in Elkhart, Indiana USA or at
a factory authorized service depot. Expenses in remedying the defect will be borne by Crown Broadcast, including two-way ground transportation cost within the continental United States. Prior to returning any product or component to Crown Broadcast for warranty work or repair, a Return Authorization (RA) number must be obtained from the Crown Broadcast Customer Service Department.
Product must be returned in the original factory pack or equivalent. Original factory pack materials
may be obtained at a nominal charge by contacting Crown Broadcast Customer Service. Resolution
of the defective product will be made within a reasonable time from the date of receipt of the defective product.
Warranty Alterations
No person has the authority to enlarge, amend, or modify this warranty, in whole or in part. This warranty is not extended by the length of time for which the owner was deprived the use of the product.
Repairs and replacement parts that are provided under the terms of this warranty shall carry only the
unexpired portion of the warranty.
Product Design Changes
Crown Broadcast reserves the right to change the design and manufacture of any product at any
time without notice and without obligation to make corresponding changes in products previously
manufactured.
Legal Remedies of Purchaser
This written warranty is given in lieu of any oral or implied warranties not covered herein. Crown
Broadcast disclaims all implied warranties including any warranties of merchantability or fitness for a
particular purpose.
Crown Broadcast
25166 Leer Drive Elkhart, Indiana 46514-5425, Phone: (574) 262-8900, Fax: (866) 262-8909
www.crownbroadcast.com
Service and Support
7-3
Page Left Blank
7-4
Factory Service Instructions
To obtain factory service, complete the bottom half of this page, include it with the unit, and ship to:
25166 Leer Drive
Elkhart, Indiana, U.S.A. 46514-5425
For units in warranty (within 5 years of purchase from any authorized Crown Dealer): We pay for
ground UPS shipments from anywhere in the continental U.S. and Federal Express Second Day
service from Hawaii and Alaska to the factory and back to you. Expedited service/shipment is
available for an additional charge. You may forward your receipt for shipping charges which we will
reimburse. We do not cover any charges for shipping outside the U.S. or any of the expenses
involved in clearing customs.
If you have any questions about your Crown Broadcast product, please contact Crown Broadcast
Customer Service at:
Telephone: (866) 262-8917 or (866) 262-8972
Fax: (866) 262-8909
Company:
Name:
Shipping Address:
Phone Number: Fax:
Model:
Serial Number:
Purchase Date:
Nature of the Problem
(Describe the conditions that existed when the problem occurred and what attempts were made to correct it.)
Other equipment in your system:
If warranty has expired, payment will be:
Cash/Check
VISA
Please Quote before servicing
Card Number:
Exp. Date:
Return Shipment Preference if other than UPS Ground:
Mastercard
Signature:
Expedite Shipment
Other
ENCLOSE WITH UNIT—DO NOT MAIL SEPARATELY
Service and Support
7-5
Appendix
Transmitter Output Efficiency
Frequency
89.7
97.9
107.9
A-1
RF Power
660
600
450
300
150
60
660
600
450
300
150
60
660
600
450
300
150
60
PA DC Volts
47.3
45.1
39.4
32.2
22.9
14.5
49.7
47.1
40.3
32.4
23
14.8
51.1
48.8
42
34.6
26.4
16.2
PA DC Current
17.2
15.9
13.68
11.42
8.87
6.95
14.86
14.12
12.55
11.11
9.22
8.26
16.24
15.8
14.56
12.83
10.91
7.09
Power Input
813.6
717.1
539
367.7
203.1
100.8
738.5
665.1
505.8
360
212.1
22.2
829.9
771
611.5
443.9
288
129.4
Efficiency
81.1
83.7
83.5
81.6
73.8
59.5
89.4
90.2
89
83.3
70.7
49.1
79.5
77.8
73.6
67.6
52.1
46.4
Page Left Blank
Appendix
A-2
Notes:
A-3
Glossary
The following pages define terms and abbreviations used throughout
this manual.
Glossary
G-1
AF
Audio Frequency; the frequencies between 20 Hz
and 20 kHz in the electromagnetic spectrum
ALC
Automatic Level Control
AM
Amplitude Modulation; the process of impressing
information on a radio-frequency signal by varying
its amplitude.
Bandwidth
The range of frequencies available for signaling.
BCD
Binary-Coded Decimal; a digital system that uses
binary codes to represent decimal digits.
BFO
Beat Frequency Oscillator
BNC
A bayonet locking connector for miniature coax; said
to be short for Bayonet-Neill-Concelman.
Broadband
As used in the FM transmitter; refers to the entire
audio spectrum as opposed to the spectrum
influenced by the pre-emphasis; also called
“Wideband”.
Carrier
A continuous signal which is modulated with a
second; information– carrying signal.
Crosstalk
In FM broadcasting, the term generally refers to the
interaction between the main (L+R) and the
subcarrier (L_R) signals as opposed to “separation”
which generally refers to leakage between left (L)
and right (R) channels.
Density (program)
A high average of modulation over time.
Deviation
The amount by which the carrier frequency changes
either side of the center frequency.
DIP
Dual In-line Pins; term used to describe a pin
arrangement.
Distortion
The unwanted changes in signal wave shape that
occur during transmission between two points.
DPM
Digital Panel Meter
EPROM
Erasable Programmable Read Only Memory
Exciter
(1) A circuit that supplies the initial oscillator used in
the driver stage.
(2) A transmitter configuration which excludes
stereo generation and audio processing.
G-2
FM30/FM150/FM300 User’s Manual
FET
Field-Effect Transistor
Frequency Synthesizer
A circuit that generates precise frequency signals by
means of a single crystal oscillator in conjunction
with frequency dividers and multipliers.
FM
Frequency Modulation; the process of impressing
a radio signal by varying its frequency.
FSK
Frequency Shift Keying; an F technique for shifting
the frequency of the main carrier at a Morse code
rate. Used in the on-air identification of frequencies.
Gain Reduction
The process of reducing the gain of a given
amplifier.
Harmonics
Undesirable energy at integral multiples of a
desired, fundamental frequency.
High Frequency
Frequencies in the 3.0 to 30.0 MHz range.
Highband
Frequencies affected by the pre-emphasis.
I/O
Input/Output
LED
Light Emitting Diode
Modulation
The process by which a carrier is varied to
represent an information-carrying signal.
MOSFET
Metal Oxide Semiconductor Field Effect Transistor;
A voltage-controlled device with high input
impedance due to its electrically isolated gate.
Nearcast
A transmission within a localized geographic area
(ranging from a single room to several kilometers)
PA
Power Amplifier
PAI
Power Amplifier Current
PAV
Power Amplifier Voltage
Pilot
A 19-kHz signal used for stereo transmissions.
Pre-emphasis
The deliberate accentuation of the higher audio
frequencies; made possible by a high-pass filter.
Processing
The procedure and or circuits used to modify
incoming audio to make it suitable for transmission.
Receiver
An option which adds incoming RF capability to an
existing transmitter. See also “Translator.”
Glossary
G-3
RF
Radio Frequency;
(1) A specific portion of the electromagnetic
spectrum between audio-frequency and the infrared
portion.
(2) A frequency useful for radio transmission
(roughly 10 kHz and 100,000 MHz).
SCA
Subsidiary Communications Authorization; see
“subcarrier.”
S/N
Signal to Noise
Spurious products
Unintended signals present on the transmission
output terminal.
Stability
A tolerance or measure of how well a component,
circuit, or system maintains constant operating
conditions over a period of time.
Stereo Pilot
See “Pilot.”
Stereo separation
The amount of left channel information that bleeds
into the right channel (or vice versa).
Subcarrier
A carrier signal which operates at a lower frequency
than the main carrier frequency and which
modulates the main carrier.
Suppression
The process used to hold back or stop certain
frequencies.
SWR
Standing Wave Ratio; on a transmission line, the
ratio of the maximum voltage to the minimum
voltage or maximum current to the minimum current;
also the ratio of load impedance to intended
(50 ohms) load impedance.
THD
Total Harmonic Distortion
Translator
A transmitter designed to internally change an FM
signal from one frequency to another for
retransmission. Used in conjunction with terrestrial
networks.
Satellator
A transmitter equipped with an FSK ID option for
re-broadcasting a satellite fed signal.
VSWR
Voltage Standing Wave Ratio; see “SWR.”
Wideband
See “Broadband.”
VCO
Voltage Controlled Oscillator
G-4
Symbols
19–kHz
level adjustment 5–3
phase adjustment 5–3
A
AC. See Power: input
ALC 3–3,3–7,4–7
Altitude
operating range 1–8
Amperes PA DC 3–3,3–8
Amplifier
RF 4–14
bias set 5–6
Antenna 2–11
mismatch 3–3
Applications 1–3
Audio
broadband 3-5
distortion 5–9
frequency 5–8
high 3–5
input connectors 2-13, 4–3
input level 1-7, 3–5
monitor connections 2–14,4–5
performance 5–7
pre-emphasis 3–5
processing 3–5,4–10
wide 3–5
Audio processor 4-3
adjustments 5–2
circuit description 4–3
circuit location 6–3
indicators 3–5
input 3–5
reference drawings 6–5
B
Backup
transmitter use 1–4
Bandwidth
RF 5–8
Bias set 5–6
Broadband. See Audio: broadband
Index
Index
C
Cables
audio input 2–12
Carrier 4–11,5–8
automatic turnoff 2–15,3–8,5–6,5–10
frequency 5–8, 5-10
Carrier switch 3–4,5–5
Channel. See Frequency
main 5–9
main into sub 5–9
sub into main 5–9
Chassis 4–15
Circuit boards
audio processor/stereo generator 4–
3,6–5
display 4-10
driver switch logic 4-11
motherboard 4-8
RF Amplifier 4-14
RF Driver 4-13
Receiver 4-16
Circuits
chassis 4–15
display 4–10
metering 4–7
motherboard 4–8
part numbering 4–2
RF exciter 4–6
Components
numbering 4–2
Composite
input 2–14
input connection 2–13
output adjustment 5–3
Connectors
audio input 2–12
audio monitoring 2–14
composite in 2–14
remote I/O 2–15
RF input 2–11
RF output 2–11
RF output monitoring 2–11
SCA In 2–13
XLR 2–12, 4–3
Cooling Fan 3-3
Crosstalk 1-7
measurements 5-9
Current limit
PA 5-5
I-1
D
De-emphasis 2-14, 5-2, 5-7
jumpers 2-14, 5-2
Delay
program failure to carrier turnoff 2-15, 5-6
Dimensions 1-8
Display
circuit description 4-10
front panel 3-2, 3-5, 3-7
modulation calibration 5-5
Distortion 1-7
audio 5-9
harmonic 4-5
Driver Switch Logic board 4-11
E
Emissions 5-8
Exciter. See RF exciter
configuration 1-4
F
Fan (PA)
cooling 3-3
Fault
indicators 3-8, 4-7
input 3-8
lock 3-8
power 3-8
servicing 3-8
SWR 3-8
temperature 3-8
FCC requirements 1-9, 5-8, 5-10
Frequency
carrier 5-7, 5-8
measurement 5-4
pilot 5-7, 5-8
receiver 2-7, 2-8
response 5-8
selection 2-4, 5-3
receiver 2-7
samples 2-5
synthesizer 4-6, 5-10
Frequency synthesizer. See RF exciter
adjustments 5-3
Front panel
display modulation calibration 5-5
FSK 1-5, 1-6
measurements 5-4
Fuses 2-3
G
Gain control 3-5
I-2
Gain reduction 4-3
Gain switches
input 3-6
H
Harmonic distortion 4-5
Harmonics 5-7
Heatsink 3-8
Highband 3-5
processing 4-4
Humidity
operating range 1-8
I
I/O connector 1-2, 2-14
pin out 2-15, 2-16
Indicators
audio processor 3-5
fault 3-8, 4-7
highband 3-5
LED 3-5, 3-7, 4-10
pilot 3-5
wideband 3-5, 5-5
Input
audio connectors 2-12
composite 2-13
fault 3-8
gain switches 3-6
program
fault 2-15
SCA connection 2-13
L
Labels 1-9
LEDs 3-5, 4-10
Line voltage 2-2
Lock
status 4-6
fault 3-8
M
Metering 1-3
Metering circuit
adjustments 5-4
location 4-7
Modulation 2-11, 3-5, 5-3, 5-7, 5-8
calibration 5-5
compensator 2-6
display 3-5
percentage 3-5, 5-9
Monitor
audio 2-14, 4-5
M (continued)
operation 2-12, 3-6
Motherboard
Multimeter 3-7
front panel 3-3
Processing
audio 1-2, 3-5
control 3-6
control setting 3-3
highband 3-5, 4-4
Program failure 2-15, 5-10
Program source 2-12, 3-6
N
R
Mono
Nearcast
transmitter use 1-3
Networks
satellite fed 1-6
terrestrial fed 1-5
Noise 1-8, 3-8
measurements 5-9
O
Operating environment 1-8, 2-2
Options 1-3, 1-4,1-5, 1-6
Output
power 1-7, 3-7
display 3-7
Output filter 4-15
P
Part numbering 4-2
Parts
spares 7-2
Performance
checklist 5-7
tests 5-10
Pilot frequency 5-8
Pilot indicator 3-5
Power
AC voltage selection 2-2
input 1-8, 2-2
output 1-3, 1-7, 5-8
display 3-7
output filter 4-15
RF 3-3, 3-7
RF amplifier 4-14
Power supply
high voltage 4-15
low voltage 4-15
Power switch 3-4
Pre-emphasis 1-7, 4-4, 5-2, 5-7
curve 2-14, 4-4
Index
Receiver
frequency selection 2-7
option 1-5
specifications 1-9
Reflectometer 4-15
Regulatory approvals 1-8
Remote control 1-2
Remote I/O
connector 2-15
pin out 2-16
Repair
warranty 7-3
RF
amplifier 4-14
bias set 5-6
bandwidth 1-8, 5-8
exciter 1-3
circuit location 1-3, 4-6
input 1-5, 2-12
output 1-2, 1-5, 1-7, 3-3, 3-7
impedance 1-7
output filter 4-15
S
Safety 1-9
Satellator
transmitter use 1-6
SCA 1-5
input connection 2-13
Sensitivity
monaural 1-9
stereo 1-9
Separation
stereo 1-7
stereo generator 5-2
Service
warranty 7-3
Service instructions 7-5
Spare parts 7-2
Specifications
receiver 1-9
transmitter 1-7
I-3
S (continued)
Stand alone
transmitter use 1-4
Stereo
separation 1-7, 5-9
Stereo generator 1-2, 2-13, 2-14
adjustments 5-2
bypassing 2-13
circuit location 6-3
Subcarrier 5-10
38kHz 5-10
Suppression
subcarrier 1-8
Switches
carrier 3-3, 3-4, 5-5
input gain 3-6
power 3-2, 3-4
receiver 2-7
stereo-mono 3-3, 3-6
SWR 3-7
calibrate 5-5
fault 3-8
Synchronization 4-11
Synthesizer, See RF exciter
VSWR 1-2, 2-11
W
Warranty 7-3
Weight 1-8
Wideband 3-5
X
XLR connectors 2-12
T
Temperature
fault 3-8
operating range 1-8, 5-10
PA 3-3, 3-8
Test point
voltage 3-8
Tests
performance 5-7, 5-10
Time-out
program input failure 2-15
Translator
transmitter use 1-5
V
VCO 4-6
Voltage
AC selection 2-2
Voltage selection 2-2
Voltmeter
display 3-8
Volts
PA DC 3-3, 3-8
I-4

FM600 Manual - Crown Broadcast

Transcription

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