User's Manual

Weehawken Tunnel UHF Repeaters
User/Maintenance Handbook
Handbook N.-Weehawken_UHF Issue No:-A
Date:-05/08/05
Page:-
55 of 72
7.11 10 & 20W Power Amplifiers (12-016302 & 12-016301)
7.11.1 Description
These amplifiers are Class A 20W power amplifiers operating from 380MHz to 470MHz in
a 1 stage balanced configuration. It demonstrates a very high linearity and a very good
input/output return loss (RL). They have a built in Current Fault Alarm Function.
They are housed is an aluminium case (Alocrom 1200 finish) with SMA connectors for the
RF input/output and a D-Type connector for the power supply and the Current Fault Alarm
Function. Note the large diameter DC power input pins (1 & 2) fitted to reduce volt-
drop/arcing.
7.11.2 Technical Specification
PARAMETER SPECIFICATION
Frequency range: 380-470MHz
Small signal gain: 23dB
Gain flatness: ±1.7dB
I/O Return loss: >18dB
43dBm (12-016301)
1dB compression point:
40.5dBm (12-016302)
OIP3: 54dBm (12-016301)
53dBm (12-016302)
Supply voltage: 24V DC
3.7Amps (12-016301)
Supply current:
2.5Amps (12-016301)
Temperature range operational: -10°C to +60°C
storage: -20°C to +70°C
Weight: <2kg (no heatsink)
7.11.3 PA ‘D’ Connector Pin-out details
Connector pin Signal
1 (large pin) +Ve input (10-24V)
2 (large pin) GND
3 Alarm Relay O/P bad
4 Alarm Relay common
5 Alarm Relay good
6 No connection
7 TTL voltage set
8 TTL alarm/0V (good)
9 O/C good/0V bad