FM2000S

The FM 2000S is a Transmitter for Radio communication in the FM band from 87.6 to 107.9 MHz which nominal power is 1800W.

The apparatus is supplied with four inputs in order to ensure the compatibility with any Audio segnal in input.

These inputs are: a Mono input with Pre-emphasis always enabled, an MPX input for Stereo multiplexed signals and two SCA inputs for additional digital signals. The transmitter may be supplied, if required, with Stereo Coder for the stereo transmission of the audio signal.

The mono input contains a series of low-pass filters able to attenuate by more than 30dB all the frequencies included between 20kHz and 100kHz, compared to the level of the 15kHz.

A limiting circuit, acting on all the input signals, works continuously in order to avoid the modulation to be higher than +/- 75kHz.

The FM 2000S uses a Microcontroller which manages the settings of the transmission frequency with 10 or 100kHz steps, as required.

Besides, it checks that the set frequency is not outside the band allowed, manages the two displays for the display of the frequency and the power, and works as protection circuit for the correct functioning of the apparatus.

The final stage is made up by two RF units amplifier, with power up to 1000W, with MOSFET technology. The coupling system grants the redundance, reducing when the output power to -6dB when one of the 2 amplifiers suffers a breakdown.

This solution, along with a good air cooling, grants a high reliability of the system and a continuous service.

The transmitter is also provided with a remote control socket.

Technical Specifications

RF 
Rated output power1800W
R.F. output connectorEIA 7/8"
R.F. output impedance50W
Frequency range87.6 - 107.9MHz
Frequency programmabilityStep 10/100kHz from panel
Frequency stabilitybetter +/- 500Hz
Modulation typedirect carrier frequency modulation
Spurious & Harmonic suppressionmeets or exceeds all FCC and CCIR requirements
Modulation capabilitymeets or exceeds all FCC and CCIR requirements
Asynchronous AM S/N ratio60dB or better
Synchronous AM S/N ratio50dB or better
 
GENERAL
AC power requirement220VAC +/-20% 50Hz
Power consumption4000VA
Panel sizeRack 19" 20U
Ambient temperature range-10 to +45°C
 
SOUND
Preenphasis50ms /75ms 
 
Composite operation (stereo)
Composite inputs4 total, 1MPX, 1Mono, 2SCA (option L/R)
MPX input1 unbalanced BNC connector
MPX input impedance10KW
MPX input level0dBm (775mV rsm/2,2Vpp)
Composite FM S/N ratioL/R 68dB (weighted) - 71dB (unweighted)
Composite amplitude response< 0.3dB 30Hz-76kHz
Composite total harmonic distortion< 0.2dB
Composite intermodulation distortion> 60dB
Crosstalk> 40dB (30Hz-15kHz)
SCA inputs2 Unbalanced
SCA input impedance10KW
SCA input levels0dBm (775mV rms 2,2Vpp) nominal for +/- 7.5kHz deviation, adjustable
SCA amplitude response+/- 0.5dB, 40kHz-100kHz
 
Monaural operation(mono)
Audio input impedance600W balanced or unbalanced
Audio S/N ratio0dBm (775mV rms/2,2Vpp) for +/- 75kHz adjustable
FM S/N ratio> 74dB (weighted) - 74dB (unweighted)
Audio frequency response+/- 0.5dB, 30Hz-15kHz
Total harmonic distortion< 0.2dB
Intermodulation distortion> 60dB

Transmisores FM / TV Enlaces Microondas TV Audio Mixers Procesadores Antenas FM / TV Televisión MMDS
Emisoras  Comunitarias Laboratorio EMC Proyectos LLave Mano Estudios Técnicos Nuevos Productos
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FM ELECTRONICA Vía La Pica Sector Campo AlegreTelf. +58-291-642-21-28 Fax 58-291-643-42-42    

 Movíl 0417-913-23-77 Maturín, EDO. Monagas Venezuela.

©2002 FM ELECTRONICA - Diseño: Fernando Moreno A.