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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.
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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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