User's Manual

UHF Fibre-Fed Remote Site
User Handbook
Handbook N.-60-137601HBK Issue No:-1
Date:-18/03/2005
Page:-
18 of 38
4. SUB-UNIT MODULES
4.1 Bandpass Filters (02-007302)
4.1.1 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 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 50 load at
the input and output ports.
No adjustments should be attempted without full network sweep analysis facilities to
monitor both insertion loss and VSWR simultaneously.
4.1.2 Technical Specification
PARAMETER SPECIFICATION
Response type: Chebyshev
Frequency range: 350 – 500MHz (tuned to spec.)
Bandwidth: 3.5 MHz (tuned to spec.)
Number of sections: 5
Insertion loss: 1.2 dB
VSWR: better than 1.2:1
Connectors: SMA
Power handling: 100W max
operation: -10°C to +60°C
Temperature range
storage: -20°C to +70°C
Weight: 3 kg
Size: 266 x 143 x 39.5mm