User's Manual

Weehawken Tunnel Remote Repeater
User/Maintenance Handbook
Handbook Nō.-Weehawken_River_P Issue No:-A
Date:-05/08/05
Page:-
21 of 36
5.2 Bandpass Filter (02-007206)
5.2.1 Description
The bandpass filters are multi-section designs with a bandwidth dependent upon the passband
frequencies, (both tuned to customer requirements). The response shape is basically Chebyshev
with a passband design ripple of 0.1dB. The filters are of slot coupled, folded combline design,
and are carefully aligned during manufacture in order to optimise the insertion loss, VSWR and
intermodulation characteristics of the unit. The tuned elements are silver-plated to reduce
surface ohmic losses and maintain a good VSWR figure and 50Ω load at the input and output
ports.
Being passive devices, the bandpass filters should have an extremely long operational life and
require no maintenance. Should a filter be suspect, it is usually most time efficient to replace
the module rather than attempt repair or re-tuning.
No adjustments should be attempted without full network sweep analysis facilities to monitor
both insertion loss and VSWR simultaneously.
5.2.2 Technical Specification
PARAMETER SPECIFICATION
Response Type Chebyshev
Frequency range: 800 - 950MHz (tuned to spec.)
Bandwidth: 25MHz (tuned to spec.)
Number of sections: 8
Insertion Loss: 1.2 dB
VSWR: better than 1.2:1
Connectors: SMA female
Power Handling: 100W max
operation: -10°C to +60°C Temperature
range:
storage: -20°C to +70°C
Weight: 3 kg (typical)