Operation and Maintenance Manual

385700-4006-006 INSTALLATION
Document use is restricted to that described on cover 2-12
2.5.2.3 Low Noise Amplifier (LNA) Channel (Channel 2)
The nominal gain of the LNA channel, as set at the time of manufacturing, is set to 30 dB.
The output alarm level is set for a threshold nominally 10 dB below the expected output pilot
level. The expected signal input range is -40 to -90 dBm. If other settings are desired, the
customer should contact Andrew with additional information when ordering the equipment.
Refer to Figure 2-8 LNA Module Outline, for LNA adjustment points locations.
Figure 2-8 LNA Module Outline
2.5.2.3.1 LNA Adjustment Equipment Setup
The equipment required to adjust the LNA output level is:
• signal generator
• power meter or spectrum analyzer
• digital volt meter
• small Blade screwdriver
• ≥ 10 dB power attenuator
• 50 ohm SMA termination
• direction control interface
See Table 4-2 Test Equipment, for a listing of suggested equipment. Refer to Figure 2-9
LNA
Output Level Test Set Up, for test equipment setup.
The signal generator should be set for an output frequency of 2467.86 MHz with an output
level of -40 dBm.
The power meter, if used, should be configured to measure signals from -70 dBm to 0 dBm.
This can be done by either using the appropriate power sensor head(s) or by using
attenuators.
The spectrum analyzer, if used, should be configured as follows: