Maintenance
General
The system requires very little maintenance. The operator should inspect the equipment
carefully and notice every possible anomaly, such as the integrity of the equipment, the
presence of rust, missing paint, and loose screws. Monthly the operator should clean the
equipment and remove dust, ash and grease with a soft cotton cloth and alcohol. Caution
must be taken not to use solvent to clean plastic parts.
For details about replaceable parts, refer to the separate installation manual(s).
Performance monitor
The performance monitor (PM) function is used for checking the performance of the
transceiver, the waveguide and the antenna.
Before the function is started you should set the range scale to 24 NM, tune the radar and
adjust the gain control to about 90%.
In this condition an intensified noise ring, positioned approximately at 24 NM should appear.
The distance of the ring from the center is directly proportional to the TXRX transmitted
output power. When the Magnetron has decreased 10 dB in peak power, the ring’s distance
will decrease to about 12 NM range.
The performance monitor is started from the main menu.
The performance monitor ring should have a missing angular sector of some 60° to 80°. This
missing sector is due to the RF beam really transmitted by the antenna. Any RF power
degradation between the magnetron and the antenna output results in a smaller angular
ring interruption. When the angular sector is reduced below 30°, the antenna section
requires service. The ring’s width (thickness) is proportional to the tuning condition. The
width of the ring for a good and correctly tuned radar will be approximately 2 NM. The ring’s
strength (difference between background noise and ring’s noise) indicates the receiver noise
figure. If the receiver noise figure degradation is more than 10 dB, it is not possible to
distinguish the performance monitor ring from the background noise.
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Note: If sector blanking is enabled, the performance monitor ring will have missing
sectors in the sector blanking areas.
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Maintenance | R5000 Operator manual
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