User Manual

4.5. Linearised Power Amplifier (12-026901)
The power amplifier fitted to (this unit) 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 amplifier has a D-Type connector for the power supply and a Current Fault Alarm
Function.
12-026901 Specification
PARAMETER SPECIFICATION
Frequency range: 380-440MHz (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
RF Connectors: SMA female
Supply: 4.6Amps @ 24V DC
operation:
-10°C to +60°C Temperature
range:
storage:
-20°C to +70°C
Weight: 1.5 kg
12-026901 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)
A1 A2
1 2
3 4 5
7-Way Connector Graphical Representation
UHF Bandselective BDA
90dB 40/5W
Document Number 55-199102HBKM Issue No. 1 Page 15 of 28