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)