fm transmitters - Tech
Transcription
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