Radar Scrambling

[Walters Chris]

>~Car and driver ran a test of a laser jammer a few months ago that used its
>~own laser instead of a bunch of IR LED's.  On a black firebird with no
>~front plate the thing effectively rendered the car invisible to laser.  Of
>~course their tests of passive jammers have always shown that they never
>~work.  One of the funniest tests I saw of those things was when they put a
>~whole bunch of them, like a dozen or so, on the dash of some car and drove
>~it at the radar gun and it didn't do a damn thing.
>
>I'll add my anecdotal evidence to this:  I got the "Phazer" unit (first
>checking that the outfit has a 90 moneyback return policy) and went out
>hunting those RADAR machines that display your speed. (Note: the "Phazer"
>is the scrambler part of the detector/scrambler sold as the "Phantom".)
>
>Results : arguable.
>
>* The instructions (not the sales pitch) mention a 100' "punch-through"
>  range.
>
>* The display post happily displayed my correct (and legal) speed BUT
>  it did not turn on until ~100'.

Ah, this means the Phantom can 'cloak' you to within 100' of the radar unit. 

Pretty good, plenty of time to slow down. I'll bet it transmits the radar's
signal back **inverted** thus causing the radar's detector to get no input.
Reflected positive signal  + xmitted negative signal = no signal. Your cloak
 drops when the power of the xmitted negative signal becomes less than
the reflected positive signal.

The next level  would be for the Phantom to automatically match the power
of the positive signal -- you'd then be invisible right as you passed by. 
Cool,
except the cop is going to know something screwy is going on when all the
cars behind you register just fine. So you'd be best served with the Phantom
sending out a percentage of your true speed.


Snake (Mr. Electronic Counter-Measures)
TWO pretty cool Fords, one very cool Dodge