Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 5/3/83; site umcp-cs.UUCP
Path: utzoo!linus!wivax!decvax!harpo!seismo!rlgvax!cvl!umcp-cs!chris
From: chris@umcp-cs.UUCP
Newsgroups: net.auto
Subject: Re: clogged traffic and other stories
Message-ID: <161@umcp-cs.UUCP>
Date: Tue, 14-Jun-83 18:34:26 EDT
Article-I.D.: umcp-cs.161
Posted: Tue Jun 14 18:34:26 1983
Date-Received: Thu, 16-Jun-83 06:26:19 EDT
References: <1677@ihldt.UUCP>
Organization: Univ. of Maryland, Computer Science Dept.
Lines: 30

Yes!  Smooth out that traffic flow!  I'll bet if you avoid using your
brakes you can save 15-20% in gas alone.

Speaking of radar jammers, I once built one.  You see, it's very easy.
The hardest part is to get a K or X band Gunn diode.  But the circuit
is quite simple:  you need only put out little pips of current at mph
times beat frequency, where beat frequency depends on the radar band (I
think, let me see...  no, it doesn't!  Or does it?  Oh forget it).
Anyway, it's around 30 Hz I think.  If you can find someone with a
radar gun you can calibrate that way.

All you need is a 555 timer, in the astable mode.  The diagram for the
555 oscillator circuit can be found in any elementary book; ask your
local Radio Shack, they probably have it somewhere.  You run it off the
car battery, and use it to power the Gunn diode.  Just pulse the Gunn
at the right frequency, use a microwave horn antenna mounted facing
whichever direction you prefer, and you're all set.  The pulses are
much stronger than the reflected wave from the radar gun, and it
misinterprets them as the reflection beat.  Turn your little
potentiometer and dial-a-speed!

Just don't get caught:  the FCC gets EXTREMELY upset.  The funny thing
is, all the police have to do to see if you've got a radar jammer is
get a radar detector.  Pretty stupid of them not to.  (Then again maybe
they do have them by now.)

Have fun kit-building!  The only difficult part is the microwave horn.
Those things are tricky.

			- Chris ({seismo,allegra}!umcp-cs!chris)