User's Manual

12 Channel Channelised Cell Enhancer
User Handbook
Handbook N.-50-122501HBK Issue No:-A
Date:-16/03/05
Page:-
18 of 40
4. SUB-UNIT MODULES
4.1 3 Port Tx Hybrid Couplers (05-000103 & 05-000104)
4.1.1 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. The ‘104’ version has higher power
capability due to an attached heatsink.
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.
4.1.2 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
25Watts (05-000103)
Power rating:
100W (05-000104)
Weight: 0.5kg