Decatur Electronics G3, User Manual & Installation Manual, Page: 59 / 76

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9.2 Road Test
After the radar unit passes the self-test you may want to conduct a
road test during each shift to confirm that the patrol motor vehicle’s
speedometer matches the unit’s patrol speed .
The road test verifies that the radar unit’s patrol speed and the motor
vehicle speedometer are within ± 1 display unit of each other . You
need to conduct the road test on a level road .
1 . Verify that the antenna is aimed correctly and parallel to the
direction of travel .
2 . Turn either the front or rear antenna on
3 . Drive the patrol motor vehicle at a constant, legal speed to verify
that the speedometer reading, and the patrol speed are within ±
1 display unit of each other .
4 . If the difference is greater than ± 1 display unit, verify that the
antenna is aligned correctly . If the antenna is aligned correctly,
this reading can indicate a speedometer inaccuracy .
• An incorrectly aimed antenna will cause the radar unit’s
patrol speed to be lower than the speedometer’s speed .