User's Manual

800MHz Tetra Repeater
User Handbook
Handbook Nō.-55-151501HBK Issue No:-A
Date:-22/04/2005
Page:-
19 of 31
4.3 Low Noise Amplifier (11-006702)
4.3.1 Description
The Gallium-Arsenide low noise amplifiers used in the unit are double stage, solid-state
low noise amplifiers. Class A circuitry is used throughout the units to ensure excellent
linearity and extremely low noise over a very wide dynamic range. The active devices are
very moderately rated to provide a long trouble-free working life. There are no
adjustments on these amplifiers, and in the unlikely event of a failure, then the complete
amplifier should be replaced. This amplifier features its own in-built alarm system which
gives a volt-free relay contact type alarm that is easily integrated into the main alarm
system.
4.3.2 Technical Specification
PARAMETER SPECIFICATION
Frequency Range: 800 – 1000MHz
Bandwidth: <200MHz
Gain: 29dB (typical)
1dB Compression Point: 20dBm
OIP3: 33dBm
Input/Output Return Loss: >18dB
Noise Figure: 1.3dB (typical)
Power Consumption: 180mA @ 24V DC
Supply Voltage: 10-24V DC
Connectors: SMA female
operational: -10°C to +60°C
Temperature Range:
storage: -20°C to +70°C
Size: 90 x 55 x 30.2mm
Weight: 290gms (approximately)
4.3.3 LNA ‘D’ Connector Pin-out details
Connector pin Signal
1 +Ve input (10-24V)
2 GND
3 Alarm RelayO/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