FM2000S
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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. |
| RF | |
| Rated output power | 1800W |
| R.F. output connector | EIA 7/8" |
| R.F. output impedance | 50W |
| Frequency range | 87.6 - 107.9MHz |
| Frequency programmability | Step 10/100kHz from panel |
| Frequency stability | better +/- 500Hz |
| Modulation type | direct carrier frequency modulation |
| Spurious & Harmonic suppression | meets or exceeds all FCC and CCIR requirements |
| Modulation capability | meets or exceeds all FCC and CCIR requirements |
| Asynchronous AM S/N ratio | 60dB or better |
| Synchronous AM S/N ratio | 50dB or better |
| GENERAL | |
| AC power requirement | 220VAC +/-20% 50Hz |
| Power consumption | 4000VA |
| Panel size | Rack 19" 20U |
| Ambient temperature range | -10 to +45°C |
| SOUND | |
| Preenphasis | 50ms /75ms |
| Composite operation (stereo) | |
| Composite inputs | 4 total, 1MPX, 1Mono, 2SCA (option L/R) |
| MPX input | 1 unbalanced BNC connector |
| MPX input impedance | 10KW |
| MPX input level | 0dBm (775mV rsm/2,2Vpp) |
| Composite FM S/N ratio | L/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 inputs | 2 Unbalanced |
| SCA input impedance | 10KW |
| SCA input levels | 0dBm (775mV rms 2,2Vpp) nominal for +/- 7.5kHz deviation, adjustable |
| SCA amplitude response | +/- 0.5dB, 40kHz-100kHz |
| Monaural operation | (mono) |
| Audio input impedance | 600W balanced or unbalanced |
| Audio S/N ratio | 0dBm (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 |
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FM ELECTRONICA Vía La Pica Sector Campo AlegreTelf. +58-291-642-21-28 Fax 58-291-643-42-42 |
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Movíl 0417-913-23-77 Maturín, EDO. Monagas Venezuela. |
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©2002 FM ELECTRONICA - Diseño: Fernando Moreno A. |