User's Manual

UHF Fibre-Fed Remote Site
User Handbook
Handbook N.-60-137601HBK Issue No:-1
Date:-18/03/2005
Page:-
14 of 38
3.1.1 Remote Site 10W BDA Description
The remote site 10W Bi-Directional Amplifier receives downlink signals from the Fibre
Optic shelf at port A and passes them through a bandpass filter tuned to the downlink
passband (408-411MHz). From there the signal is amplified by a Low Noise Amplifier
(+31dB) and a 0-15dB switched attenuator to a 10Watt power amplifier (22dB). A final
bandpass filter completes the downlink path to the off-air antenna (port C).
The uplink path starts at the off-air antenna (port C)and is passed first through a bandpass
filter tuned to the uplink band (417-420MHz). A 20dB amplifier and switched attenuator
amplify the signal by 20dB and the signal then passes through a final bandpass filter to the
AGC attenuator. After the attenuator the signal is amplified to one Watt power to the AGC
logarithmic detector giving this path a dynamic range of approximately 30dB. After the
AGC detector the signal exits the shelf to the FO shelf at port B.
3.1.2 Remote Site 10W BDA Electrical/Mechanical Specification
PARAMETER SPECIFICATION
Downlink frequency range: 408–411MHz
Uplink frequency range: 417-420MHz
Port A: -10dBm (downlink input)
Port B: 0dBm (uplink output)
Approximate
RF levels (BDA shelf):
Port C: +38dBm (antenna output)
Port A:
0dBm (downlink output)
Approximate RF levels
(FO shelf):
Port B:
0dBm (uplink output)
6A max.@ 24V DC
Power supply consumption:
1.0A max @ 12V DC
Chassis height: 4U
Chassis depth:
400mm (excluding handles &
connectors
IP protection: IP54
Impedance: 50
AGC level: 0dB
Relative humidity range: 5-95%
Alarms: 2 x LNA, 1W LPA, & 1 x 10W PA
1 & 2 (2 x LNA’s & LPA)
Alarm connector outputs:
3 & 4 (1 x 10W PA)
operation: -10%C to +60%C
Temperature Range:
storage: -20%C to +70%C