User Manual

P B L Tunnels Loc 2 Units 1 & 2 + 800MHz BDA
Maintenance Handbook
H/book Number:-60-056100HBKM
Issue No:-1
Date:-13/02/2003
Page:-70 of 70
5.3.2 ¼Watt 0- -30dB Switched Attenuator (10-000701) See section 5.1.2
5.3.3 Low Noise Amplifiers (11-005902 & 11-006702)
5.3.3.1 Description
The Gallium-Arsenide low noise amplifier used in the unit is a double stage, solid-state low
noise amplifier. 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.
5.3.3.2 Technical Specification (11-005902)
Frequency Range: 800 – 960MHz
Bandwidth: <170MHz
Gain: 19.5dB (typical)
1dB Compression Point: 21dBm
OIP3: 33dBm
Input/Output Return Loss: >20dB
Noise Figure: 1dB (typical)
Power Consumption: 190mA @ 24V DC
Supply Voltage: 10-24V DC
Connectors: SMA female
operational: -10°C to +55°C
Temperature Range:
storage: -40°C to +70°C
Size: 90 x 55 x 30.2mm
Weight: 280gms (approximately)