V1 no alert k band sometimes

so havent been on here in a while, jus been loving the v1. they put the 'your speed is' signs up at my school recently and im having a little trouble. The first day, as I enter school i drive right past it and its tellin me my speed. v1 doesnt do anything....Im like ok maybe its like a new radar band or somethn lol i dunno. The next day as im leavin im passin the sign and turnin on my v1 at the same time. 10 seconds later BAM K Band full alert, no beep, just a loud ass buzz scared the heck outa me. Arrows point at the sign. Today same thing as I pull into school nothn.

-same sign entering and leaving.
-v1 set on L
-the ride to school is about 30 min so the v1 was on for 30+ min and stayed quiet but alerted when just turned on after 3+ hours. Not sure if that has anythn to do with it but yea.


Any info?

Here is what Mike Valentine had to say about a Valentine One missing a speed sign. I am sure this applies to all top of the line radar detectors.

The failure to alert to a particular speed sign might have one of several causes:

1) The speed sign may employ an FM-CW modulation technique to sense the direction of vehicles in its field of view. This feature is used to isolate departing from oncoming traffic. The V1 does not recognize FM-CW modulation as a valid police radar signal and tries to reject it. FM-CW is allowed for license-free "Part 15" devices by the FCC. FM-CW is not allowed for police radar. There are numerous traffic-volume sensors using FM-CW spread all around metropolitan areas these days that detector owners would rather not produce an alert. Otherwise freeway driving (in Cincinnati, at least) would be very annoying. It's a good thing that the V1 rejects FM-CW modulated signals.

2) The speed sign may have drifted out of the police radar band from aging or temperature. "Part 15" devices are somewhat notorious for this behavior. Automatic door sensors and Doppler security sensors are both "Part 15" devices, too. Few automatic door sensors use FM-CW because of the added expense. The speed sign devices can afford the added cost of including the FM-CW modulating hardware.

3) The V1 in question may need for our service department to have a look at it to make sure it is operating correctly.

My v1 did this on the uk gatsometers, it stayed quiet until i was passed it then i got a full alert!

I would send it in most defientley!