Radar alerting ... Why?

jodog

jodog

Joined
Jan 27, 2012
Messages
102
Location
Minnesota
Bike
12 ST 1300; 20 Wing
2026 Miles
020695
I bought a Adaptiv Radar Detector earlier this year and for the first couple of months there wasn't much to report. Lately I have been getting Ka band alerts and I figured out that it's doing it when a semi approaches on a two lane highway. Not all semis do this, but it's increasingly happening. I'm running the detector in Highway NoX, NoK mode. It alerts that a Ka signal is detected. Stops immediately after passing the semi.

Any idea what's up? I used to get farm equipment setting it off, but that was always X band.
 
I use the Uniden R4 but haven't notice that for KA... I'll need to pay attention more.

The K goes off a lot or Mazdas and Hondas with their radars. The Hiway Radar app allows you to turn off certain KA frequencies as well but I just haven't gotten into that. I know it's irrelevant as it only works wth a couple of Radar detectors.

You'd have to see what actual KA frequency they're using in order to see about isolating/blocking it.
 
My guess is it is from their on-board electronic "logbook" or tracking that let's them pass by inspection/weigh scales.
 
Most (Honda Mazda Freightliner) adaptive cruise control runs at 76 to 77 gigahertz freq. A harmonic freq of 77 (half) would be 35 ghz. Right in the center of the Ka band which is 33.4 to 36 ghz.

(my guess is) Ya'lls detectors are just too good picking up transmitted harmonics.

FYI, my $30 Walmart Cobra detector which (low key (haha)) works real good does the same thing.
 
I have had my Adaptive Radar Detector for at least 10 years (maybe more). I change ranges on the device based on where I am traveling. And yes, mine has done the same thing as you discussed.

I don't know the exact reason but I always figured it had something to do with a device being used that had the same frequency range or a harmonic thereof.

I can change it to "City NoX" when I am sort of out of the area where I might get trapped if I was speeding. Speeding means exceeding the speed limit. Not going 100 MPH. Otherwise I keep it set to "Highway".
 
Could this be caused by the Adaptive Cruise controls on some vehicles? These devices use radar to sense the vehicles in front of them.
 
Adaptive has not kept up with the latest higher end detectors that offer sophisticated false filtering, like Uniden, Valentine and Escort. This is becoming more and more necessary with all the garbage radar out there from blind spot monitoring, adaptive CC, and autonomous vehicles. Having said that it’s usually K band as opposed to Ka garbage. I’ve never gotten a Ka hit with my Uniden R7 or R8 off of a big rig.
 
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