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  1. #1
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    Default 8500 not alerting full k hit when getting weak ka band

    I was using my old 8500 (non x50) for something unrelated when i came across a strange occurence i thought i should share.
    I don't know if it applys to the x50's or not.

    i noticed the 8500 tends to give preference to ka alerts over k band alerts. i found that if i make it alert to even a weak or moderate ka alert, using my tester, that it will not audibly alert to even a full blast k band hit from a radar gun. The only way you would know, is if you are in EXP mode and look at the display and see a full k alert.
    I found that if i hold the k alert long enough it eventually overpowers the ka alert and signals, but not until it could be too late.
    Now a strong ka alert wouldn't matter, as you would be slowing anyway, but a weak ka hit will mask a full blast k hit, so it's possible if you were driving and started getting a weak ka alert, you could be missing a strong instant on alert on k band.
    I also noticed that when the k band signal would finally overpower the ka signal and alert, it would stop displaying or alerting the ka signal, even though the tester was still on. It would take several seconds after the k alert stopped, before it would start alerting to ka again, even though the tester was still on the entire time.

    I captured this on video and i'll upload it tomorrow.

    Hopefully this isn't a problem with the x50's or even an issue that could happen on the road with an 8500, but i thought i would mention it in case someone wants to test this on an x50 just to be sure.

  2. #2
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    Default

    Does this mean that the 8500 is filtering out too much? That's one way to cut down on the falses.

  3. #3
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    Could be that they're trying to keep K-band door openers from masking weak Ka alerts. If you get a Ka signal you're probably going to slow right down, anyway.

  4. #4
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    i'm dropping a bunch of video stuff on my computer right now. once i edit this part of it, i'll add a link to this post.

    As for the filtering, i'm not sure what 's going on. It's in highway mode.
    I hope it doesn't filter that much.
    I think i'll do a quick test on the road and film it. I'll have someone with the k band gun ahead, have them do a constant on, and an instant on.

    The hardest part seemed to be keeping a weak ka tone, as you'll see in the video. Also for what ever reason, when the k band gun would "overpower" the ka signal from the weaker tester, it would stop alerting to ka all together for several seconds, even though i would keep the tester on and even move it closer to the 8500.

    If i can't duplicate it on the road, it might not matter. and like brick said, you would probably slow down if your getting a ka alert anyway. we'll see how the test comes out.


    Okay, here it is:2.41 MB
    http://www.donspc.com/Forum/8500katestsm.wmv

  5. #5
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    Bad news sports fans, i could repeat in the field and was clocked without any warning of k band, until after i was already being clocked, and got closer to the gun.

    I got it on video, and here it is: 1.9MB
    http://www.donspc.com/Forum/8500katestcitysm.wmv

    Now let me say that this video isn't my best work by far, and that's a big understatement. ( i think it kind of sucks and i'm a bit embarrased to be associated with it, but it serves it's purpose. ops: ) I happened to meet some people for lunch, and asked them to help out for a couple of runs. I had the tester in one hand and the camcorder in the other . my passenger had the steering wheel in one hand and the phone on the other. The radar operator in the parked grey truck on the left had a dying phone so this was a quick run.
    You should be able to tell by the audio and phone conversation that i was clocked well in advance of getting the alert, due to the weak ka it was getting.

    Now this test is by no means conclusive or scientific, but nonetheless i thought i would share this info anyways, just in case it affects the x50 and nobody knows about it.
    Maybe someone with an x50 or another 8500 can do some further testing, say with 3 vehicles. A weak ka source next to or behind and a k band "trap" ahead.

  6. #6
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    The X50 is the same way. For audio tones K band overides X, Ka overrides K and X band. Since the detector can only alert 1 tone at a time, it makes sense to me that it alerts this way. Yes, the EXP display is the only way to know if there is K or X around when it's alerting Ka band before it detects the other band.

  7. #7
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    I could see it alerting in that order if the signals were the same, i don't understand why it would ignore the strongest threat though. i would much rather have it alert to the strongest signal, or at least change audio momentarily to le you know of another alert, then go back to the strongest one.
    I always ran mine dark, so it makes me wonder what else was going on since it would stick with one tone only.

    well, good to know. Thanks.

  8. #8
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    Quote Originally Posted by RacerX
    I could see it alerting in that order if the signals were the same, i don't understand why it would ignore the strongest threat though. i would much rather have it alert to the strongest signal, or at least change audio momentarily to le you know of another alert, then go back to the strongest one.
    I always ran mine dark, so it makes me wonder what else was going on since it would stick with one tone only.

    well, good to know. Thanks.
    That's what the V1 does and I don't really think it makes a difference. I mean, let's say you get a strong K-band source coming from the CVS next to you and a very weak Ka signal over the hill from a local cop using instant-on. If it weren't prioritized then you could see the Ka hit in the multi-threat display but you'd miss it entirely if you weren't looking at it. The way Escort prioritizes you won't run into that situation. VR gets around that with bogey-lock tones but they can get CRAZY annoying in parking lots.

    Point being: I don't think you have anything to worry about. It's giving you exactly the information that you need.

  9. #9
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    Quote Originally Posted by brick
    VR gets around that with bogey-lock tones but they can get CRAZY annoying in parking lots.
    I hear that....that is actually the one thing I changed in my programming: option A, bogey lock tone volume after pressing mute.

    Jim

  10. #10
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    That's what the V1 does and I don't really think it makes a difference. I mean, let's say you get a strong K-band source coming from the CVS next to you and a very weak Ka signal over the hill from a local cop using instant-on. If it weren't prioritized then you could see the Ka hit in the multi-threat display but you'd miss it entirely if you weren't looking at it. The way Escort prioritizes you won't run into that situation. VR gets around that with bogey-lock tones but they can get CRAZY annoying in parking lots.
    I can see where you're coming from, but how does it know that the strongest threat is a door opener and not a legit k band signal locking on? Especially when i did this with a legit k band source. It makes more sense to alert to the biggest threat.
    My V1 will change tone to alert to the strongest threat, but enough on that, the last thing i want to see is to turn this into another detector debate thread.
    Like i said, i brought it up so people are aware of it. Maybe (hopefully) for 99.99% of the x50 owners this would never be an issue or problem. in reality it's not an issue for me now, since i don't use it anymore. I could see this exact scenario happening to me though. Where i live, i drive through a stretch of county to get to the closest town. The local PD uses ka band. The sheriff uses k and some ka. On more than one occasion i will pick up one or the other, and this is where my concern came into play.
    If i picked up a weak constant ka signal, and the sheriff was coming towards me with instant on, or sitting off to the side of the road using instant on, i might not ever hear a k band alert, even though it's the strongest threat, and suddenly i'm getting stopped as the 8500 finally alerts to k band.

    Anyway, thanks for the thoughts and opinions on this.

 

 

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