User's Manual

Bronx Justice Centre Radio Repeaters
Handbook Number: 80-283501HBKM Page: 19 of 86
4.1.7.1Description
The two duplex bi-directional amplifier shelves receive a downlink signal from the input antenna,
amplify it to a level suitable for processing by a channel selective module and send the resultant 10W
power signal to its designated antenna.
The uplink path is very similar but in reverse with only a five Watt RF output power. Both paths
feature a ferrite isolator on the output to prevent damage to the power amplifier should any reflected
signals occur at their output antenna ports.
4.1.7.2Technical Specification
PARAMETER SPECIFICATION
Height: 3U
Width: 19" (482.6mm)
Shelf
dimensions:
Depth: <450mm (excluding connectors & handles)
operational: -20°C to +60°C Temperature
range:
storage: -40°C to +70°C
Weight: <10kg
153.956MHz (Ch. 1)
Downlink channel frequency:
158.925MHz (Ch. 2)
151.355MHz (Ch. 1)
Uplink channel frequency:
154.6575MHz (Ch. 2)
Shelf gain: 100dB (typical)
Impedance: 50ȍ
Humidity: 5 – 95% non-condensing
RF Connectors: N type female
Environmental protection: IP44
Case: Iridite NCP coating
Heatsinks: Black anodised
Handles: Silver anodised aluminium alloy
Finish
Fascia: Painted to RAL7035