User's Manual

Weehawken Tunnel VHF Repeater System
User/Maintenance Handbook
Handbook N.-Weehawken_VHF Issue No:-A Date:-05/08/05
Page:-
52 of 75
7.3 3 Port Tx Hybrid Coupler (05-000103)
7.3.1 Description
The transmitter hybrid couplers provide isolation from unwanted reflected frequencies to/from
the leaky feeder antennas. They are 4 port devices with the one unused port terminated
internally with a 50 dummy load.
Being passive devices, the hybrid couplers should be maintenance free over their entire lifetime
and have an extremely high MTBF figure. It is not recommended that the top cover be removed
or any of the internal components needlessly touched, since the original factory
alignment/tuning would be extremely hard to reproduce in a ‘field’ environment.
7.3.2 Technical Specification
PARAMETER SPECIFICATION
Frequency Range: 140-170 MHz
Bandwidth:
±10% of f
o
Insertion Loss: 3.2dB
Impedance: 50
V.S.W.R: 1.2:1
Input to input isolation: >20dB
Connectors: Type N Standard
Dimensions: 140 x 120 x 35mm
Power rating: 25Watts
Weight: 0.5kg