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Section 12—Troubleshooting
No target readings
in stationary mode
(cont).
No patrol speed (unit
not in lock)
Unsquelch the audio and verify that a
Doppler tone is heard when targets
are present. If no Doppler tone is
heard, change antennas or remove
unit from service.
Refer to fan interference in Sec. 8.2.
Remove unit from service if above
tests fail.
Verify that the unit is NOT in the
HOLD mode.
Verify the desired antenna is selected.
Verify the antenna is aimed parallel to
the ground and straight down the
roadway.
Verify there are no obstructions
directly in front of the antenna.
Weather conditions (heavy rain, snow
or fog) may affect the ability to pick
up groundspeed.
Verify the patrol speed is above the
minimum patrol speed setting and
below 100 MPH (160 km/h). To
check the setting, press PAT/SEL.
To change the setting, press MODE.
Place unit in stationary mode and
unsquelch audio. Drive patrol vehicle
and verify the TARGET window
displays proper ground-speed and the
Doppler audio is free of interference.
If no speed readings are obtained, or
no Doppler tone is heard, change
antennas.
12.4
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