JRC JMA-9133-SA Instruction Manual page 409

JMA-9100 Instruction Manual
[2] Check the Receiver System
Procedures
1) Turn the [VRM] dial to make adjustments so that the farthest
point of the performance monitor pattern.
2) Check the attenuation value.
*Receiver System
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8.COUNTERMEASURE FOR TROUBLE ...
MON Pattern Range
Initial value: 18.0NM
Attenuation Value
Normal operating range：-2.9dB to +3.5dB
Performance degradation range: -15.0dB to -3.0dB
If Receiver System Attenuation Value display is under -3 dB or
Transmitter System Attenuation Value display is under -7 dB with
the performance monitor test, radar should be checked by service
engineer. This means that the TX/RX unit may be faulty. Consult
with the near-by dealer or our sales department.
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8.3 PERFORMANCE CHECK
Adjust the VRM to the farthest
point of the performance
monitor pattern
Performance Monitor pattern
( When the performance of
receiver unit is degraded, the
pattern distance will be
shorter. )
8