From: dbushong@wang.com (Dave Bushong)
Subject: Re: Radar detectors
Organization: Wang Labs, Lowell MA, USA
Date: Thu, 30 Jul 92 13:50:40 GMT

tcs@ll.mit.edu (Tom Sefranek) writes:

>|> 
>|> 
>|> >I heard about a device that would 'confuse' radars making them think
>|> >that the car is going at lower speed; does anyone know anything about
>|> >this?.        
>|> 
>|> There was a gadget on the market briefly around 10 years ago that
>|> did this - it transmitted a modulated 10.525 GHz signal with the
>|> modulation freq set by a knob calibrated in MPH (jeeze!) but later
>|> produced with the calibration in Hz.  It required a ham radio license
>|> to operate it.  I haven't seen this thing on the market in a long time.
>|> 
>|> There was an article in one of the hobby electronics magazines (Pop. Elec.,
>|> etc.) at roughly the same time that used a coffee can as the cavity,
>|> and passively reflected the radar signal with some new modulation on
>|> top of it (that is, any speed you select).
>|> 
>|> I wish I had more details about issue number, manufacturers, etc., but
>|> you might try one of those online magazine database services and look
>|> for some of the keywords that would apply.
>|> 
>|> Hope this helps!
>|> 
>|> Dave
>|> 
>|> -- 
>|> ==========================================================================
>|> Dave Bushong, KZ1O@K1UGM.MA         +    No .sig, no tattoo, 
>|> Wang Laboratories, Inc.             +        no bald spot, no nothin!!
>|> Internet: dbushong@wang.com         +-------------------------------------
>|> Project leader, OCR Products        + (reserved for future expansion)


>Dave,
>	Ask a ham, there are severaly at Wang.  Your posting linking the HAM
>band 10 ghz with radar is BOGUS!!!  We don't do pulse mode, we don't do 10.525G.
>And we certainly wouldn't be involved with defeating the police radar.

>Come join us, don't guess!

>Tom
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Tom,

I don't know why you posted a followup for the net to see, but I'll 
respond in kind.

Let's see...  I know "severaly" of the hams at Wang; I'm one of them;
there is a ham band at 10 GHz; there are hams that break various
laws (I try to not be one of those, though); and I was just answering
a question, not trying to cast a moral judgement on the poster.  Police
radar does not use pulse, it's CW (doppler) and mixes the transmitter
with the receive signal yielding a beat frequency of 31.4 Hz per
mile-per-hour at 10.525 GHz.  Hams use radar detectors to make
contacts on Field Day for extra points, since the 10.0 to 10.5 GHz
ham band is close enough in frequency.

By the way, who is "us" and why would I want to join you?

My reply was factual, and I stand by it.

Dave 
Amateur radio station KZ1O
Licensed since 1967 at age 12
-- 
==========================================================================
Dave Bushong, KZ1O@K1UGM.MA         +    No .sig, no tattoo, 
Wang Laboratories, Inc.             +        no bald spot, no nothin!!
Internet: dbushong@wang.com         +-------------------------------------
Project leader, OCR Products        + (reserved for future expansion)
Newsgroups: sci.electronics