General

The IRT RWT-3820 / RWR-3820 Wide Band RF Fibre Optic Link is a modular system for transmitting broadband RF 'L' band FM modulated signals over an optical fibre cable. The system response is from 900 - 2150 MHz.
The link is designed for transferring the down converted 'L' band signals from satellite dishes to main equipment buildings. Fibre optic cable provides low signal attenuation with no gain or cable equalisation requirements with the added benefit of immunity to RFI and EMI and protection against lightning strikes.
The system is designed for single mode fibre (9/125 µm) at 1300 nm with a path loss of up to 12 dB. The operating distance will depend upon the actual cable and connector losses.
RF signal connections are made to 75Ω SMC connectors on the rear panels. BNC and F adapters are provided.
Optical connections are made to SC/PC optical connectors on at the rear of the module. Modules can be installed in IRT 1 RU or 3 RU frames.

RWT-3820 LASER Transmitter
Wide band amplifiers are used to drive the DFB LASER with the RF signals applied to the module input. The signal level is set by a front panel control for optimum signal to noise ratio. A pilot signal is added to the RF path to monitor the RF path integrity at the receiver.
Pilot signal level and laser output LED indicators are provided as well as a relay contact set for external alarm indication of laser power or DC supply loss.
LNB power can be applied through a connector on the rear panel.
RWR-3820 Photo-detector Receiver The receiver consists of an optical detector diode module followed by an adjustable gain stage and amplifiers to provide two RF outputs from the receiver.
The output signal level is adjusted to the required level as seen at the RF Mon connector. This level is the same as the rear output signal level.
Pilot and optical signal level LED indicators are provided as well as a relay contact set for external alarm indication of optical signal, pilot or DC supply loss.

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