User's Manual

Two Channel 400MHz Cell Enhancer
User Handbook
Handbook N.-50-128501HBK Issue No:-A
Date:-12/08/2005
Page:-
20 of 39
4.5 Low Noise Amplifier (11-007402)
4.5.1 Description
The 30dB gain low noise amplifier used is a double stage solid-state low-noise amplifier.
Class A circuitry is used in 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 which gives a TTL ‘open collector’ type switched signal on
alarm, this is then integrated using a built-in relay to give a volt-free contact for
summation into the main alarm system.
4.5.2 Technical Specification
PARAMETER SPECIFICATION
Frequency range: 380-500MHz
Bandwidth: <140MHz
Gain: 30-32dB
1dB Compression Point: +22dBm (typical)
3rd order intercept: +34-35dBm (typical)
Input/Output return loss: >20dB
Noise figure: <1.3dB
Connectors: SMA female
Supply: 300-330mA @ 24V DC
operational: -10°C to +60°C
Temperature range:
storage: -20°C to +70°C
Weight: 0.38kg
Size: 90 x 55 x 30.2 (case only)
4.5.3 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