User's Manual

Weehawken Tunnel VHF Repeater System
User/Maintenance Handbook
Handbook N.-Weehawken_VHF Issue No:-A Date:-05/08/05
Page:-
33 of 75
5.2 VHF Downlink Combiner (80-230901)
5.2.1 VHF Downlink Combiner Description
The VHF downlink combiner shelf is the interface between the downlink VHF cell
enhancers and the tunnel leaky feeder outputs. It consists of a number of two-to-one hybrid
couplers which combine the outputs to two bandpass filters which only allow the specified
VHF band to pass.
Being a passive shelf, no alarms are present.
5.2.2 VHF Downlink Combiner Technical Specification
PARAMETER SPECIFICATION
153.75-155.30MHz (D/L)
Frequency ranges:
159.0-161.0MHz (D/L)
VSWR: better than 1.5:1
Insertion loss: <1.5dB
Rejection: >30dB
RF Connectors: N type, female
operational:
-10°C to +55°C
Temperature
range:
storage:
-40°C to +70°C
Case: Alocrom 1200
Heatsinks: Matt black
Handles: Silver anodised alloy
Finish:
Fascia Painted to RAL 7035
Alarms Fitted: None