User Manual

Fibre Optic Master and Remote Site
User Handbook
Document Number: 60-212701HBK - Issue No. 1 Page 20 of 50
4.1.6. 80-245101 Major Sub Components
4.1.6.1. 25W Linearised Amplifier Module (12-026902)
Linearised Power Amplifier (12-026902) is a multi-stage, solid state power amplifier. Class A circuitry
is employed throughout the device to ensure excellent linearity over a wide dynamic frequency range.
All the semi-conductor devices are very conservatively rated to ensure low device junction
temperatures and a long, trouble free working lifetime.
The power amplifier should require no maintenance over its operating life. Under no circumstances
should the cover be removed or the side adjustments disturbed unless it is certain that the amplifier
has failed; since it is critically aligned during manufacture and any re-alignment will require extensive
test equipment. The module housing is an aluminium case (Iridite NCP finish) with SMA connectors
for the RF input/output and a D-Type connector for the power supply and the Current Fault Alarm
Function.
12-026902 Specification
PARAMETER SPECIFICATION
Frequency range: 440-500MHz (tuned to spec.)
Bandwidth: <60MHz (typical)
Maximum RF output: >25Watt
Small signal gain: 37.5dB (typical)
1dB compression point: +44dBm
3
rd
order intercept point: +61dBm
Noise figure: N/A
Return input loss: >15dB
Return output loss: >15dB
VSWR: better than 1.5:1
Connectors: SMA female
Supply: 4.6Amps @ 24V DC
operation:
-10qC to +60qC
Temperature
range:
storage:
-20qC to +70qC
Weight: 1.5 kg
PA 7-Way Connector Pin-outs
Connector Pin Signal
A1 (large pin) +24V DC
A2 (large pin) GND
1 Alarm relay common
2 TTL alarm/0V good
3 Alarm relay contact (bad)
4 Alarm relay contact (good)
5 O/C good/0V bad (TTL)