User Manual

Axell Wireless Limited
Technical Literature
L.A. M.T.A. Remote Sites
Document Number 80-301401HBKM Issue No. 1 Date 13/06/2008 Page 132 of 148
4.13.5.5. 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
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