User's Manual

Tetrapol Band Selective Repeater
User Handbook
Handbook Nō.-55-124801HBKM Issue No:-1
Date:-22/01/2004
Page:-
16 of 32
5. SUB-UNIT MODULES
5.1 Bandpass Filters & Duplexer (02-007306 & 16-041401)
5.1.1 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 50Ω 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.
5.1.2 Technical Specification (02-007306)
PARAMETER SPECIFICATION
Response type: Chebyshev
Frequency range: 350 – 500MHz (tuned to spec.)
Bandwidth: >5.0 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 +55°C
Temperature range
storage: -40°C to +70°C
Weight: 3 kg
Size: 266 x 143 x 39.5mm
5.1.3 Technical Specification (16-041401)
RX Pass Band: 380-385MHz
TX Pass Band: 390-395MHz
Bandwidth: 5 MHz
Channel Separation: 5 MHz
Insertion Loss: < 1.8 dB
Rejection (between channels) >70 dB
Rejection at crossover:
>50 dB (+2.5MHz low band -
2.5MHz high band)
Return Loss: > 20 dB (at all ports)
Power Handling (CW): 20W
SMA (Tx/Rx ports)
Connectors:
N type (Antenna ports)
Weight: <6kg