Speed clocked without radar/laser!
Joined: Sep 2005
Posts: 770
Likes: 1
From: Boulder, CO
Speed clocked without radar/laser!
I thought I would post in the regional forum first because maybe this is something that is common in Colorado. 
I was traveling 470 West when I noticed one of those large "Your speed is ??" signs on the side of the road. It correctly measured my speed BUT my radar detector was silent. WTF is this? It looked like one of the pull up to a location signs the Highway Department sets up.I recently moved here from New York and when those portable speed signs were used they set off my radar detector, k band. Does anyone know how they are measuring my speed? It must be something embedded in the road.... right???? Curious!
I was traveling 470 West when I noticed one of those large "Your speed is ??" signs on the side of the road. It correctly measured my speed BUT my radar detector was silent. WTF is this? It looked like one of the pull up to a location signs the Highway Department sets up.I recently moved here from New York and when those portable speed signs were used they set off my radar detector, k band. Does anyone know how they are measuring my speed? It must be something embedded in the road.... right???? Curious!
Joined: Sep 2005
Posts: 770
Likes: 1
From: Boulder, CO
not sliding down that slippery slope...
Oh how I don't want to open that can of worms.
I purposely left that information out.
It is one of the two best that this forum argues about. Nuff said.
Joined: Sep 2005
Posts: 770
Likes: 1
From: Boulder, CO
Okay.. didn't want to do this.. but it's a V1. I really don't want to hear how I should have bought this brand or that brand. I know my detector is working.
I usually run with it in "Advance Logic" mode. I turned it to "All Bogey's" mode and I still don't get any signal from this thing. Curious!
I usually run with it in "Advance Logic" mode. I turned it to "All Bogey's" mode and I still don't get any signal from this thing. Curious!
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Joined: Sep 2005
Posts: 770
Likes: 1
From: Boulder, CO
Originally Posted by RaDaRkInG
This is what Mike Valentine, the inventor of the original Escort and current V1, has to say about this:
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.
As long as it alerts to cops using radar and the usual X and K band door openers from the same distance, I woudn't worry about it.
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.
As long as it alerts to cops using radar and the usual X and K band door openers from the same distance, I woudn't worry about it.
That makes perfect sense!! As I stated in my original post, I still get alerts to X and K bands. Just to be on the safe side, I may send it in to have them look at it.Thanks again!
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Joined: Apr 2006
Posts: 1,536
Likes: 6
From: Fishers, IN (NE Indy)
Originally Posted by RaDaRkInG
This is what Mike Valentine, the inventor of the original Escort and current V1, has to say about this:
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.
As long as it alerts to cops using radar and the usual X and K band door openers from the same distance, I woudn't worry about it.
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.
As long as it alerts to cops using radar and the usual X and K band door openers from the same distance, I woudn't worry about it.
Very impressive. I have an X50 now. Is anything new coming out that I should jump on? I feel like my X50 is getting old.
Originally Posted by binar
I thought I would post in the regional forum first because maybe this is something that is common in Colorado.
I was traveling 470 West when I noticed one of those large "Your speed is ??" signs on the side of the road. It correctly measured my speed BUT my radar detector was silent. WTF is this? It looked like one of the pull up to a location signs the Highway Department sets up.I recently moved here from New York and when those portable speed signs were used they set off my radar detector, k band. Does anyone know how they are measuring my speed? It must be something embedded in the road.... right???? Curious!
I was traveling 470 West when I noticed one of those large "Your speed is ??" signs on the side of the road. It correctly measured my speed BUT my radar detector was silent. WTF is this? It looked like one of the pull up to a location signs the Highway Department sets up.I recently moved here from New York and when those portable speed signs were used they set off my radar detector, k band. Does anyone know how they are measuring my speed? It must be something embedded in the road.... right???? Curious!
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