Re: "Radar Scramblers"

[Frederic Breitwieser <frederic.breitwieser@mcione.com>]

>Wouldn't this S/N ratio assume that the jammer is only reflecting the
>signal rather than contributing to the return?  I would think that we
>would need to know the cop's signal strength, the % the car reflects,
>and the jammers signal strength.  I have no idea how strong police radar
>is so maybe this is a moot point, but simply using the cross section of
>the jammer and car seems counter-intuitive.  

Modern radar works by quick sampling several doppler'd return signals, to
eliminate falsing by poor aiming, lousy terrain, thunderstorms (heavy rain
affects most radar, though not LIDAR as much as we'd all like), lack of
flat surfaces, etc.

Of course doing the speed limit eliminates this problem altogether.

>Maybe this has to do with active vs passive jammers.  Maybe we're
>assuming that passive means it doesn't transmit, I was assuming that
>passive meant off-until-needed (ie: no user input/control required). 

That's the general definition of passive jammers.  They manage the doppler
reflection back, rather than actively sending out a "10 mph" signal.

>Anyway, still have to worry about vascar, pacing, and lidar :-(

Pacing is my favorite... and really the only way I get caught.  Though
after all the points on my license, I've discovered I *CAN* do 5 mph above
the speed limit and still be relaxed.

Frederic Breitwieser
Homebrew Automotive Mailing List
Bridgeport, CT 06606
http://www.geocities.com/MotorCity/Downs/4605/index.html
1989 AG Hummer 4-Door
1993 Supercharged Lincoln Continental
2000 Mid-Engine Sports Car <smile>

Seeking info on: Audi 5k Locking Diffs, Audi 5k trans bolt pattern, and
17x11" rims.





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