fm transmitters - Tech

FM
TRANSMITTERS
simplicity • reliability • modularity • serviceability
5kW FM Transmitter
The 5kW offers the most affordable, field proven,
reliable, solid state transmitter on the market.
Its simplicity, and superior modular design make the 5K
both easy & versatile to operate and maintain.
The 5kW utilizes the EX2-250 250W Stereo Exciter
as the driver. The EX2-250 provides the ultimate in audio
performance to rival most digital exciters on the market
today.
The 5kW R.F Amplifier consists of 6 x 1kW
wideband amplifiers. Each amplifier consists
of 4 x 280W parallel amplifiers stages. The
6 x 1kW amplifiers are combined via a 6-way
Wilkinson hybrid combiner, which provides adequate
isolation between stages, to enable a 1kW
module to be removed without interrupting service.
Switching unit and telemetry interface are optional to provide
remote and automatic control and fault monitoring.
The system PSU is based on a linear supply, including a
transformer and linear regulators to provide operation
in un-stable mains environments.
FEATURES
- Superior audio performance
- Dual or single exciter operation (dual optional)
- Mosfet technology (6 x 1kW Mosfet amplifiers)
- System control via RS485 telemetry interface (optional)
- In-built transient suppression module (optional)
- SCA and RDS Operation (standard)
- Built-in forced air cooling system
- Operation into cavity input or star point combiner (standard)
5kW FM Transmitter with
dual exciter in 38U cabinet
1kW R.F. Amplifiers including fans and
wilkinson combiner and harmonic filter
EX2-250 250W Stereo Exciter/Driver
An ISO 9001 Certified Facility
L a r c a n U S A • 1 3 9 0 O v e r l o o k D r i v e • L a fay e t t e , C O 8 0 0 2 6
P h o n e : 3 0 3 . 6 6 5 . 8 0 0 0 • Fa x : 3 0 3 . 6 7 3 . 9 9 0 0 • E - m a i l : s a l e s @ l a r c a n . c o m
TECHNICAL SPECIFICATION
PARAMETER
PARAMETER
RF SPECIFICATION
Frequency Range
RF Output Power
RF Spurious Emission
RF Harmonics
Asynchronous AM
Synchronous AM
Frequency Synthesizer
Frequency Steps
Frequency Stability
Out of Band lock-out
Frequency Deviation
RF output connector
RF Monitor Connector
POWER SUPPLY
AC Power Input
Mains Variation
Mains Frequency
Efficiency
380V three phase 7400VA
+10% - 15%
50Hz +/-1Hz (60Hz optional)
66%
ENVIRONMENTAL
Operating Temperature
Operating altitude
Humidity
-10EC to +45EC
<4500 metres
<90% (non condensing)
PHYSICAL
Dimensions (inches)
Weight
35.2W x 26.6D x 73.6H (40U)
551.2 Lbs
TELEMETRY
Alarms ( Voltage Free)
COMPOSITE SPECIFICATION
W/B Amplitude Response
+/- 0.2dB (30Hz to 100kHz)
W/B Stereo Separation
>60dB (typical 67dB) 30Hz to
15kHz (decoded)
W/B Stereo Cross Talk
>50dB (30Hz to15kHz) L+R
into L-R
Total Harmonic Distortion
<0.1% (Typical 0.035%) 30Hz to
15kHz (decoded)
FM S/N Ratio
>70dB (30Hz to20kHz) 50us
de-emph. Ref. To +/- 75kHz
deviation
I/P Impedance
1k2 ohms balanced
Deviation Sensitivity
3.5V p-p for +/- 75kHz deviation (adj)
87.5 to 108 MHz (F5E/F8E)
5kW ( Max 5.2kW)
<-75dBc
<-70dBc
<-60dB(filtered 20Hz to 20kHz)
<-60dB(filtered 20Hz to 20kHz)
PLL ( Direct Modulation)
100kHz (local/remote)
+/- 2ppm
>80dB ( with PLL unlocked)
+/- 75kHz Peak
1 5/8” EIA flange 50 Ohm
BNC 50 ohm
STEREO OPERATION (Option 1)
AF Amplitude Response
+/-0.3dB (30Hz to 15kHz)
Stereo Separation
>60dB (typical 66dB)
30Hz to 15kHz (decoded)
Mono/Stereo Cross Talk
>50dB (30Hz to15kHz) L+R
into L-R
Stereo Distortion
<0.1% (Typical 0.035%)
30Hz to 15kHz (decoded)
Stereo S/N Ratio
>70dB (30Hz to20kHz) 50us
de-emph. Ref. To +/- 75kHz
deviation
Input Impedance
600 ohms balanced (XLR)
Deviation Sensitivity
+6dBm for +/-40kHz deviation (adj)
STEREO LIMITER (Option 1)
Audio Limiter Sensitivity
10dBm nom. For 62.5kHz deviation
Attack Time
< 2mS for increased 10dB I/P step
Decay Time
>80mS for decreased 10dB I/P step
Limiter Distortion
< 0.35% (10dB into Limiting)
Limiter Threshold
Internally adjusted
Forward, Reflected, Temp,.PSU
Mono/Stereo, PLL Lock, mains
failure, interlock
STEREO
AUDIO
I/P
W/B
L
R
W/B
400V A.C.
3 PHMAINS
EX2-250
EXCITER
(MAIN)
EX2-250
EXCITER
(STANDBY)
MAINS
TRANSIENT
EQUIPMENT
130W
COAXIAL
SWITCH
130W
20W
1kW
20W
1kW
20W
1kW
20W
1kW
20W
1kW
20W
1kW
6 WAY WILKINSON COMBINER
STEREO
AUDIO
I/P
L
R
6 WAY SPLITTER
R.F. AMPLIFIERS
O/P
COUPLER
5kW
R.F.
O/P
3X230V A.C.
MAINS
CONTROL
UNIT
TELEMETRY
O/P
BSES5K
CABINET
OPTIONAL
SCHEMATIC DIAGRAM OF 5KW FM TRANSMITTER
L a r c a n U S A • 1 3 9 0 O v e r l o o k D r i v e • L a fay e t t e , C O 8 0 0 2 6
P h o n e : 3 0 3 . 6 6 5 . 8 0 0 0 • Fa x : 3 0 3 . 6 7 3 . 9 9 0 0 • E - m a i l : s a l e s @ l a r c a n . c o m