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L.A. M.T.A. Remote Sites

Document Number 80-301401HBKM Issue No. 1 Date 13/06/2008 Page 31 of 148

3.4.5. VHF/UHF BDA Unit(80-301403) Major Sub-components

Section Component

Part

Component Part Description Qty Per

Assembly

3.4.5.1. 01-002503 Bandpass Filter 4

3.4.5.2. 07-002908 30dB Directional Coupler 1

3.4.5.3. 10-000701 Switched Attenuator 0.25Watt, 0 - 30dB 4

3.4.5.4. 11-005401 Low Noise Amplifier 1

3.4.5.5. 12-016301 TETRA Power Amplifier 20W 1

3.4.5.6. 12-021601 TETRA Power Amplifier 5W 1

3.4.5.7. 12-021801 Low Power Amplifier 1

3.4.5.8. 12-025602 VHF Power Amplifier 5W 2

17-001101 AGC Detector Assembly 3

17-001105 AGC Detector Assembly (Logarithmic) 1

3.4.5.9.

17-001201 AGC Attenuator Assembly 4

3.4.5.10. 20-001602 24V Dual Relay Assembly 2

3.4.5.11. 80-008902 24V Relay Assembly 1

3.4.5.12. 94-100004 Dual Diode Assembly 1

3.4.5.13. 96-200024 DC/DC Converter 1

3.4.5.1. Bandpass Filter (01-002503)

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 helical 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 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.

01-002503 Specification

SPECIFICATION PARAMETER

Downlink 154.0 MHz to 161.5 MHz

Bandpass

Frequency

Uplink 155.5 MHz to 161.0 MHz

Downlink 7.5MHz

Bandwidth

Uplink 5.5MHz

No. of sections 6

Insertion loss 1.5dB

VSWR Better than 1.2:1

Connectors SMA

Power handling 100W maximum

operational -20°C to +60°C Temperature

range

store -40°C to +70°C

Weight 3 kg

Size 384 x 82.5 x 56.4mm