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  #37  
Old 03-04-2011, 04:23 PM
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Re: Adaptive Cruise = Useless Radar Detector?

my x50 had the gps so I could lock out false alarms, but my redline (newest passport detector) eliminated the gps for better range...but blocking X and K IMO is the only way to go!

and when you say eliminates false alarms for you, don't you still have to lock out the signal?
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  #38  
Old 03-04-2011, 04:29 PM
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Re: Adaptive Cruise = Useless Radar Detector?

No, I can if I want to but I don't. Some cops still use K band radar, and a good amount of false alarms are K band. It's a trade off. Either way I can mute it from a button on the plug so it's not a big deal either way.
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  #39  
Old 03-04-2011, 04:46 PM
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Re: Adaptive Cruise = Useless Radar Detector?

so then how does it block a false alarm without you telling it that was a false alarm?
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  #40  
Old 03-04-2011, 08:59 PM
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Re: Adaptive Cruise = Useless Radar Detector?

I honestly have no clue dude...
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  #41  
Old 03-04-2011, 10:35 PM
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Re: Adaptive Cruise = Useless Radar Detector?

Sorry guys, I don't buy that ACC is triggering your detectors, it operates on a frequency that's 3 times as high as the highest police radar frequencies. Look for some other source, it's not the ACC. Also, since the ACC antenna is facing forward how would it only trip the rear input on the V1?

It may be the cross path detection as that fires out the rear but I don't think that's operating when you are in drive.
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  #42  
Old 03-04-2011, 10:41 PM
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Re: Adaptive Cruise = Useless Radar Detector?

^Because radar bounces like crazy, it would end up bouncing off of objects around you and reflecting back toward your detector.
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  #43  
Old 03-04-2011, 10:58 PM
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Re: Adaptive Cruise = Useless Radar Detector?

Quote:
Originally Posted by MasterWK View Post
^Because radar bounces like crazy, it would end up bouncing off of objects around you and reflecting back toward your detector.
I understand that but trust me, radar firing out the front of a vehicle will trigger the front sensor on the V1 and it will be so much stronger than the signal being reflected back into the rear that the V1's internal logic will not report the rear signal. At most it will go the the side arrows but unlikely consider the strength differences.

The V1 uses a fairly simple algorithm to determine where the radar is coming from. It "listens" on it's two antennas and based on the relative signal it's seeing makes a determination on which arrow to light. When it sees signals in the front and the rear that are within a certain percentage of each other it signals the side arrows. Once either antenna's signal strength exceeds the other by a significant difference it lights the arrow that represents the stronger signal even though it may still be "hearing" some residual signals in the other antenna.

Oh, and before you say that you have seen it light both arrows at the same time, that's a function of the bogey counter. What you are seeing are 2 different radar signatures, one from the front and the other from the rear. No 2 radar units transmit on the exact same frequency and in fact, modern Ka units sweep a range of frequencies. The V1 can differentiate between 2 radar guns by exploiting these differences.

Trust me on this guys, I used to design detectors and have owned 5 different radar units over the years and logged thousands of miles testing radar guns, detectors and jammers.

Back to the issue at hand, the FCC regulates the ACC frequencies and as you can see from my previous post they are far outside what the detectors should be listening for. Turn off ACC and see if it still goes off. If it does call Valentine and see what they say. It's possible your V1 unit has gone off frequency and is picking up a harmonic, especially since it only seems to be the rear antenna.
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  #44  
Old 03-05-2011, 09:38 AM
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Re: Adaptive Cruise = Useless Radar Detector?

I suspect it is the blind spot detection.

I have a 10 year old V1 and it was falsing to the rear, so I bought a new one directly from Valentine. It is doing the exact same thing.

Neither falses to the rear in my other car.

I have an email in to Valentine Research, we shall see what they say.
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  #45  
Old 03-05-2011, 09:57 AM
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Re: Adaptive Cruise = Useless Radar Detector?

mjw530's comment about harmonics is interesting, although a straight 2x harmonic should be on an awfully high frequency. Harmonics are, or at least should be, 60 dB or more weaker than the fundamental signal. If so, then changing the placement of the detector within the vehicle might be enough to keep it from sensing the WK2's (presumably) feeble harmonic or sub-harmonic signal.
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  #46  
Old 03-05-2011, 11:00 AM
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Re: Adaptive Cruise = Useless Radar Detector?

Looks like the Audi Q7 has this same issue.

Quote:

Audi side assist

Even with all the sophisticated active driver assistance systems such as ESP, the primary objective of Audi research work is to prevent dangerous situations from arising in the first place. For this reason a designated department, the “Audi Accident Research Unit” analyses accidents. Their aim is to analyse those areas in which people often make mistakes and to lessen the impact of these by providing high-tech solutions in the vehicle. The new Audi side assist is one of them.
Similarly to adaptive cruise control, the latest generation of Audi side assist utilises intelligent radar technology. The side assist, a world first, has been specifically designed for lane changes, as it monitors the critical blind spot. Two 24-gigahertz radar sensors in the rear bumper monitor the area next to and behind the Audi Q7 to warn the driver – additionally to the image in the rear-view mirror – of any approaching vehicles. The sensors have a range of up to 50 metres.

http://www.audiworld.com/news/06/q7/assistance/content.shtml

Here are some links:


http://veilguy.blogspot.com/2007/05/...avoidance.html

http://veilguy.blogspot.com/2007/05/...-mix-well.html

http://veilguy.blogspot.com/2007/05/...ence-with.html
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  #47  
Old 03-05-2011, 01:11 PM
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Re: Adaptive Cruise = Useless Radar Detector?

This is one of a few reasons I didn't bother with any of these "safety" options. Since I have no experience with the WK2 + those "safety" options and RADAR/LASER combination, I'll chime in with my personal V1 and other vehicles experiences. Some of these systems can use either.

Some "safety" systems do trip the V1 in both RADAR and LASER. Even cheap RADAR detectors that leak will get noticed by the V1. I've had hits on both and it was frustrating to find out it was some car with the annoying options. I've done a combination of moving forward, falling back and circling around the offending vehicles and positively identified the sources. Hey, nothing better to do on long, boring trips so a little experimenting kept me entertained.

I haven't bothered to collect data about vehicle types. My concern is that eventually these technologies will trickle down to more vehicles as standard equipment and will become increasingly annoying for detector enthusiasts. Hopefully the detector manufacturers are able to suppress detection but that will probably be unlikely since sensitivity and selectivity is a delicate balance. As we get more and more of these systems on the roads, we may have more and more inattentive idiots out there relying on these systems and actually causing more accidents.

Here is something I found that is older but not as old as some other stuff that was posted. http://citeseerx.ist.psu.edu/viewdoc...=rep1&type=pdf
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  #48  
Old 03-05-2011, 02:46 PM
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Re: Adaptive Cruise = Useless Radar Detector?

Here's a video of a Chrysler Town & Country minivan falsing a V1. Looks like we won't make many friends on the road!


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