K band is a radar frequency band
NHTSA training material lists K-band radar at 24.15 GHz. A detector scans supported bands and alerts when it receives a signal within its configured detection range.
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Guide
What Does K Mean on a Radar Detector, and How Should You Read It?
K on a radar detector refers to a microwave radar band used by speed-measuring equipment. An alert only indicates that the detector has received energy in that band; it does not identify the source with certainty.
An alert is not proof of police radar
Automatic doors, vehicle safety systems and other electronics can create signals that some detectors report as K-band alerts. Treat an alert as information to assess safely, not confirmation of a source.
Why detector settings change alerts
Sensitivity modes and filtering can affect which signals trigger a warning. Read the manual for your model before changing settings, since filtering may also affect alerts you want to receive.
K band compared with Ka band
K and Ka are separate frequency bands. NHTSA gives K-band as 24.15 GHz and Ka-band as a range from 33.4 to 36 GHz; a detector labels them separately when it supports both.
Respond safely to a warning
Keep your attention on the road and obey posted limits. Do not handle the detector while driving; review settings and alert history only when safely parked.
Common questions
Questions before you buy
What frequency is K band on a radar detector?
NHTSA training material identifies K-band speed-measuring radar at 24.15 GHz. A detector may display a band alert without identifying the exact transmitter.
Does a K-band alert always mean police?
No. Other devices can emit signals in or near bands that detectors monitor, so alerts can have non-enforcement sources.
What is the difference between K band and Ka band?
They are different radar frequency bands. NHTSA lists K at 24.15 GHz and Ka across 33.4 to 36 GHz.
Should I turn K band off to stop false alerts?
That depends on your location and detector capabilities. Check the manual and local enforcement context; disabling a band can also suppress alerts in that band.
Sources and how we chose
- NHTSA, Speed-Measuring Device Operator Training Manual · 2026-10-19
- Uniden R8 product page · 2026-10-19
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