User's Manual

Weehawken Tunnel UHF Repeaters
User/Maintenance Handbook
Handbook N.-Weehawken_UHF Issue No:-A
Date:-05/08/05
Page:-
48 of 72
7.5 Crossband Coupler (07-005701)
7.5.1 Description
The purpose of a crossband coupler is to either combine/split transmission signals from
different parts of the frequency spectrum.
The crossband coupler fitted here, is the means by which the separate VHF and UHF
frequency band signals are mixed to form a composite RF signal.
It basically comprises of a 3 port device, two filters, one a low pass the other a high pass, that
are then mixed and fed to a common output. The couplers are built into a machined
aluminium casing having a centre screening wall between the filter sections and lid secured by
screws at frequent intervals over its perimeter to obtain a tight seal and to ensure linearity and
stability of response.
7.5.2 Technical Specification
PARAMETER SPECIFICATION
250MHz: 70-250MHz
Passband
380MHz: 380-960MHz
Power Rating: 50 Watts (CW)
Number of Input ports: 2
Number of Output ports: 1
Insertion loss: 0.5 dB
Isolation:
> 50 dB 70-250MHz
> 50 dB 380-960MHz
(15 dB typical return loss 500-960)
Impedance: 50 
Connectors: SMA- female