User Manual

STTRS DOCUMENTATION
Document Number 80-330501HBKM – Issue A - Draft Page 293 of 500
17.4.1.3. Bandpass Filter (02-012701)
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. 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.
02-012701 Specification
PARAMETER SPECIFICATION
Frequency range 1805 – 1880 MHz *
Insertion loss <0.6 dB
>60 dB over 1710 – 1785 MHz
Rejection
>40 dB over 1905 – 2170 MHz
Return loss > 20 dB
Power handling 200W (CW)
operation -20°C to +60°C Temperature
range
storage -40°C to +70°C
Size 227 x 95 x 60mm (case only)
* tuned to customer’s specification
17.4.1.4. Bandpass Filter (02-007206)
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.
02-007206 Specification
PARAMETER SPECIFICATION
Response type Chebyshev
Frequency range 800 - 950MHz *
Bandwidth 25MHz *
Number of sections 8
Insertion loss 1.2 dB
VSWR better than 1.2:1
Connectors SMA female
Power handling 100W max
operation -20°C to +60°C Temperature
range
storage -40°C to +70°C
Weight 3 kg (typical)
*tuned to Customer's specification