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Old 07-10-2009, 03:13 PM   #11 (permalink)
wag
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Default Re: Tower broadcasting at 632 - 638 MHz

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Originally Posted by sclemmons View Post
Wondering if this might be the problem, the tower is short and right in the middle of where I was testing last night.

Channel: 41 632 - 638 MHz Licensed
File No.: BLEDT-20030430AAX Facility ID number: 721
CDBS Application ID No.: 658788

30° 39' 33.00" N Latitude 87° 53' 33.00" W Longitude (NAD 27)

Polarization: Horizontal (H) Effective Radiated Power (ERP): 199. kW ERP Antenna Height Above Average Terrain: 185. meters HAAT -- Calculate HAAT Antenna Height Above Mean Sea Level: 209. meters AMSL Antenna Height Above Ground Level: 158. meters AGL
199 kw at 638MHz? WOW! That kind of power can easily generate harmonics of several watts in the mid GHz range at short distances. This would wreak havoc with a RD! That much power can even induce significant signals in the RD circuit board itself, bypassing the antenna entirely and overloading the front end. No wonder you are getting false alerts!
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Last edited by wag; 07-10-2009 at 03:36 PM..
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Old 07-10-2009, 03:23 PM   #12 (permalink)
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Default Re: XTR 690 SE excessive Ka falsing

I will look into this source of interference and let you know what I can do to solve it.
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Old 07-10-2009, 04:29 PM   #13 (permalink)
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Default Re: XTR 690 SE excessive Ka falsing

I think I have a serious problem with the voice on my 690se...It keeps asking if I would like Fries with that.....I have yet to figure it out!!!....Just kidding
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Old 07-10-2009, 06:56 PM   #14 (permalink)
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Default Re: No additional falsing

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Originally Posted by sclemmons View Post
I got zero false alerts on any band driving around today in the metro Mobile area. I think that this confirms that there is some unusual RF\Microwave\etc. near my home.
Do you live near Craig Peterson on a mountain?
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8500 - 4/5 Ka, 6/10 K
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To all the Belscort users who think that cops using quick trigger are not a problem in their area...they aren't a problem.............................if you own a V1.



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Old 07-10-2009, 08:13 PM   #15 (permalink)
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Default Re: No additional falsing

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Do you live near Craig Peterson on a mountain?
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Old 07-11-2009, 01:27 PM   #16 (permalink)
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Default Re: XTR 690 SE excessive Ka falsing

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I will look into this source of interference and let you know what I can do to solve it.
Mike B i know the filter modes are intended for leaky RD's but while i'm running in Filter 2 mode it never ever falses on Ka in Dallas/Ft.worth area. How ever in Filter mode it will pick up some Microwave towers K and Ka band. There is allot of these towers in that area. POP on increases these alerts by 40% more falses. In New Mexico there is a communication tower that leaks X band for 7-9 miles.
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Old 07-11-2009, 01:37 PM   #17 (permalink)
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Default Re: XTR 690 SE excessive Ka falsing

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I just purchased two XTR 690 SE's to replase older Whistlers that were not performing well detecting Ka. However, both of them (in my car and in my wifes car ) are falsing to the point of being useless. They false on Ka, Ka POP, and Ka and K Pulse usually strength 9.

This happens in our driveway, in the neighborhood, city streets, county roads, state highways and the interstate. Without exageration, we are unable to travel even one mile without multiple Ka, (POP and Pulse) indications. There are a couple of locations in the neighborhood where I regularly detect specific Ka frequency IDs but my wife just gets a Ka strength 9 signal .(Unusually we get no Xband falsing even in Highway mode in places where our old detectors would always pick up door openers etc.).

Currently running Filter 2, Ka with frequency ID, X on, K on, POP, Safety Warning, etc. I will try turning off POP, Safety Warning, etc.
I have always read where Ka is alerting. It should be a real radar alert. I haven't heard of Ka falsing, only X and K band falsing.
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Old 07-11-2009, 01:41 PM   #18 (permalink)
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Default Re: XTR 690 SE excessive Ka falsing

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Originally Posted by milkman View Post
Quote:
Originally Posted by sclemmons View Post
I just purchased two XTR 690 SE's to replase older Whistlers that were not performing well detecting Ka. However, both of them (in my car and in my wifes car ) are falsing to the point of being useless. They false on Ka, Ka POP, and Ka and K Pulse usually strength 9.

This happens in our driveway, in the neighborhood, city streets, county roads, state highways and the interstate. Without exageration, we are unable to travel even one mile without multiple Ka, (POP and Pulse) indications. There are a couple of locations in the neighborhood where I regularly detect specific Ka frequency IDs but my wife just gets a Ka strength 9 signal .(Unusually we get no Xband falsing even in Highway mode in places where our old detectors would always pick up door openers etc.).

Currently running Filter 2, Ka with frequency ID, X on, K on, POP, Safety Warning, etc. I will try turning off POP, Safety Warning, etc.
I have always read where Ka is alerting. It should be a real radar alert. I haven't heard of Ka falsing, only X and K band falsing.
Ka falsing issues are Leaky RD's Cobra,Uniden,Safety alert,Older Bels and some microwave/transmission towers.
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