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 130 of 148
4.13.5.1. 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)
4.13.5.2. Splitter/Combiner (05-002602)
The Splitter/Combiner used is a device for accurately matching two or more RF signals to single or
multiple ports, whilst maintaining an accurate 50: load to all inputs/outputs and ensuring that the
VSWR and insertion losses are kept to a minimum. Any unused ports should be terminated with an
appropriate 50: load.
Being passive devices, the splitters should have an extremely long operational life and require no
maintenance. Should a unit be suspect, it is usually most time efficient to replace the whole module
rather than attempt repair or re-tuning.
05-002602 Specification
PARAMETER SPECIFICATION
Frequency Range 856 – 861MHz
Bandwidth 5MHz
Ports 3
Insertion loss 3.3dB
Return loss input & output 1.3:1
Impedance 50ȍ
Isolation >20dB
MTFB >180,000 hours
Splitting 20Watts
Power rating
Combining 0.5Watt
Connectors SMA female
Weight 200g (approximately)
Size 54 x 44 x 21mm