On Tue, 15 Feb 2011 08:32:11 -0800 (PST),
" wrote:

This type of product is advertised almost everywhere that it helps you
avoid tickets etc.

Episode 18: Beat the Radar Detector
http://mythbustersresults.com/episode18

I imagine that it must transmit a signal on the
same freq. as the radar gun at the moment it receives the police
transmission.

You have a good imagination. The illegal ones are essentially radar
jammers. That's not as easy as it sounds as getting the timing just
right so that it coincides with a radar *PULSE* is tricky. Most
handheld radars now work on several bands simultaneously, making a
universal radar jammer somewhat difficult and expensive to produce.

Even at low power can this still meet part 15 of the FCC
rules or any part for that matter?

The FCC fails to appreciate such products:
http://www.fcc.gov/eb/Orders/2007/DA-07-299A1.html
http://www.radarjammer.com/news/fcc-seizure.html
Note the $25,000 fine. Intentional Part 15 radiators (as opposed to
incidental radiators) are restricted from operating in various bands
(15.205) which include all the radar bands. Nice try.
http://www.hallikainen.com/FccRules/2010/15/205/

I happen to drive slowly but
millions of people don't.

Careful. I've received a ticket for driving too slowly on the
freeway.

Can someone please tell me how it works?

How what works? There are dozens of products, varying from crude
jammers to ultra-sophisticated military ECM rehashes. Each works
somewhat differently. This might help:
http://www.radarjammer.com

How
can something like this product which for all intents and purposes
"interferes with police business" be legal? Just wondering. Lenny

47 U.S.C. S 333 of the FCC rules clearly states that active radar
jammers are illegal. Note that S 333 is up for revision due to
intentional cell phone jamming in prisons etc.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558