User's Manual

800MHz & VHF Cell Enhancers
Maintenance Handbook
H/book Number:-50-078001HBKM
Issue No:-
A
Date:-02/09/2004
Page:-
56 of 88
5.9 3 Port Tx Hybrid Coupler (80-024203)
5.9.1 Description
The transmitter hybrid couplers provide isolation from unwanted reflected frequencies
to/from the leaky feeder antennas. They are specialist narrow-band 3 port devices, designed
with rejection and power handling as the main criteria. 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.
5.9.2 Technical Specification
PARAMETER SPECIFICATION
Frequency Range: 140-175 MHz
Bandwidth:
±10% of f
o
Insertion Loss: 3.5dB
Rejection: -18dB
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: 50Watts
Weight: 0.5kg