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be few reasons for this. 1. There is
strong magnetic field near the radar detector. This could be even car speakers. 2. There is
power lines going above the place where you are trying to calibrate. 3. To
complete calibration you need to press both the volume control buttons while
the vehicle is parked.. The display will show "CAL MODE". Then slowly
drive at least 2 complete circles while in calibration mode. Then again press
both the volume control buttons for 2 seconds until it beeps and shows "
CAL DONE" in the display.
I dont know of any radar detectors that need to be calibrated. To calibrate the radar, you would need a source of RF energy like a radar gun and a ton of specialized equipment.
Just turn it on, place it up high enough on the windshield or dash so that it has a clear "view" of the road. Suction mounts on windshields get the detector higher and it offers you a better view and an earlier warning as it can "see" over the hill better.
I looked at another simuilar Detector and read on Digital Compass Calibration and through the process of elimination found that if I Press CITY for 3 sec.'s COMPASS CALIBRATION showed on the display. Then it says TURN YOUR VEHICLE SLOWLY 2 TIMES to CALIBRATE. Then press the CITY button to complete the calibration. Done. It worked my Early Warning EW-3400 Radar Detector's Compass is now Calibrated.
Thanks for asking.