User's Manual

VHF Headstation & In-Line Amplifiers
User Handbook
Handbook Nō.-50-127201FCC Issue No:-A
Date:-14/06/2005
Page:-
25 of 45
4.4 VHF/UHF Low Noise Amplifier (11-006002)
4.4.1 Description
The 21dB gain low noise amplifier used is a double stage solid-state low-noise amplifier.
Class A circuitry is used throughout the unit to ensure excellent linearity over a very wide
dynamic range. The two active devices are very moderately rated to provide a long, trouble-
free working life. There are no adjustments on this amplifier, and in the unlikely event of
failure then the entire amplifier should be replaced. The amplifier features a dedicated, in-
built alarm monitoring system based on class A DC biasing levels whose output is a volts-free
relay contact pair that may be integrated into an existing system via the 9-way D-type
interface.
4.4.2 Technical Specification
PARAMETER SPECIFICATION
Frequency range: 70 – 500MHz
Bandwidth: <430MHz
Gain: 21dB (typical)
1dB Compression Point: +20dB (typical)
3rd order intercept: +33dB (typical)
Input return loss: >14dB
Output return loss: >20dB
VSWR: Better than 1.5:1
Noise figure: <2.7dB
Connectors: SMA female
Supply: 230 - 260mA @ 10 to 24V DC
Size: 88 x 50 x 34mm (ex. connectors)
operational: -10°C to +60°C
Temperature range:
storage: -20°C to +70°C
Weight: 0.26kg
4.4.3 LNA ‘D’ Connector Pin-out details
Connector pin Signal
1 +Ve input (10-24V)
2 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