User's Manual

P B L Tunnel Units 1 & 2
Maintenance Handbook
H/book Number:-60-056100HBKMFCC
Issue No:-2
Date:-04/01/2006
Page:-
21 of 63
5. SUB-UNIT MODULES
5.1 Unit 1 (60-056101)
5.1.1 Bandpass Filters (02-007302)
5.1.1.1 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.
5.1.1.2 Technical Specification (02-007302)
PARAMETER SPECIFICATION
Response type: Chebyshev
Frequency range: 350-500MHz (tuned to spec.)
Bandwidth: <3.5 MHz
Number of sections: 5
Insertion loss: 2.7 dB (typical)
VSWR: better than 1.2:1
Connectors: SMA
Power handling: 100W max
operation: -10°C to +55°C
Temperature range
storage: -40°C to +70°C
Weight: 3 kg (approximately)
Size: 266 x 143 x 39.5mm