User Manual

STTRS DOCUMENTATION
Document Number 80-330501HBKM – Issue A - Draft Page 149 of 500
10.4.3.6. Low Noise Amplifier (11-005902)
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 any alarm system.
There is a Current Fault Alarm Function, which indicates failure of each one or both RF transistors by
a various alarm output options. The amplifier is housed in an aluminium case (Iridite NCP finish) with
SMA connectors for the RF input/output and a 9way D-type for DC and alarm outputs.
11-005902 Specification
PARAMETER SPECIFICATION
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 +60°C Temperature
range
storage: -40°C to +70°C
Size: 90 x 55 x 30.2mm
Weight: 0.28kg
*tuned to Customer's specification
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