User Manual

Axell Wireless Limited
Technical Literature
L.A. M.T.A. Remote Sites
Document Number 80-301401HBKM Issue No. 1 Date 13/06/2008 Page 62 of 148
3.6.5. 800MHz BDA UNIT (80-301405) Major Sub-components
section Component
Part
Component Part Description Qty Per
Assembly
3.6.5.1. 02-011601 Bandpass FIlter 4
3.6.5.2. 05-002602 Splitter/Combiner 2
3.6.5.3. 07-002907 30dB Directional Coupler 1
3.6.5.4. 10-000701 Switched Attenuator 0.25Watt, 0 - 30dB 2
3.6.5.5. 11-005902 Low Noise Amplifier 2
3.6.5.6. 12-018601 5W Power Amplifier 1
3.6.5.7. 12-020501 20W Power Amplifier 2
17-001101 AGC Detector Assembly 1
17-001105 AGC Detector Assembly (Logarithmic) 1
3.6.5.8.
17-001201 AGC Attenuator Assembly 2
3.6.5.9. 20-001602 24V Relay Dual Assembly 1
3.6.5.10. 94-100004 Dual Diode Assembly 1
3.6.5.11. 96-200024 DC/DC Converter, 24V in, 12V 5A out 1
3.6.5.1. Bandpass Filter (02-011601)
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 50ȍ 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.
02-011601 Specification
PARAMETER SPECIFICATION
Downlink 856 to 861MHz Frequency
Range
Uplink 811 to 816MHz
Downlink 5 MHz
Bandwidth
Uplink 5 MHz
Number of Sections 8
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 (typical)