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Hi; I don't own any radar anything..therefore the question can't be answered since you asked about "...your radar (RALOL) :)
However, if you want to know what the proper procedure is...or technique is for calibrating the instrument you own...
Contact the authorized repair service center for the particular make and model name of your radar detector; you should be able to find that info in your owner's manual; try Google if you lost the manual...or contact the business where you bought it from- tell them you're in need of tech support for your unit.
Sorry; since you didn't post any info about the name or model number to your unit, I couldn't offer better help.
I should have mentioned if none of the suggestions work you may have a burned out speaker. The heat generated by the windshield dries the speakers out. I have had two speakers replaced in my Whistler 78 Pro in the last 5 or 6 years.
Turn the unit off and then, while holding down the City and Brt buttons, turn it back on. This restores the factory default settings. Worked for mine with the exact same problem. Be sure to use the power switch though. If you just unplug the cord and plug it back in, it won't work.
Entering Selectable Features Mode
1. With the unit OFF, press and hold the CITY button then press
the PWR/VOL button. The amber X LED will illuminate and a short
“beep” will sound.
2. Immediately after the “beep”, digit #1 will appear and indicate
the status of the sws™ Selectable Feature. To select digit #2 (VG-2
Guard®), press the CITY button again. To select digit #3 (sws™
Voice), press the CITY button a third time and to select digit #4
(Digital Voice prompts for Radar/Laser/VG-2 Guard®) press the
CITY button once again. Use the CITY button to select one of the
3. If the selected digit is solid, feature is ON, but may be canceled
by pressing the AUDIO button. Two “beeps” and the flashing digit
will confirm feature is OFF.
4. If the selected digit is flashing, the feature is OFF, but may be
activated by pressing the AUDIO button. A single “beep” and
solid illumination will confirm the feature is ON.
5. Press the PWR/VOL button to retain your new settings for Selectable
Features. Two “beeps” will confirm that you have exited from
Selectable Features Mode and your unit will be ON.