From: "Alan B. Pearce" Subject: Re: [EE]: 10GHz and fluorescent light > I have always thought that the ideal police radar jammer would be a length > of microwave plumbing with PIN diodes across it at a critical point, Switching the transmition line terminated in a significantly below-line impedance to above-line impedance, to create same and reversing polarity pulses (hope I got the polarities right!). >so they switch off and on at a suitable audio > frequency to represent a car at about 30mph. Better dither the frequency and inject audio noise. If there are other psychological speed queues, the cop might get suspicious. I hear in Texas their gettin medieval on truck drivers with just radar detectors. Obvious plumbing on the car wouldn't look good. > If the plumbing was long enough > the radar unit may think there was two cars in the beam because of the time > between echoes. I had even considered the possibility of having a U shaped > piece of plumbing with a horn at each end running around the roof of the car > to get the length! Might be a bit more elegant to use a loaded line with signifcantly lower phase velocity, ferrite (well, probably not above X-band) or glass or teflon. Then the line can be much shorter and smaller. I think they use to use mercury in acoustic delay lines for radar processing before the advent of SAW filters. Magnetic film technology for delay lines and matched filters is probably how the pro's do it. A negative resistance oscillator, (GaAs Fet's would probably be easier to work with than Gunn's) to amplify the reflected signal would help too. All that trouble when the cops are probably all using lasers now. You can spoof them too, just not as easy ;-) (low power) microwaves are just fun to play with anyway. Scott ******************************************************* If you are cheater #1 of 10, shame on you. If you are cheater #1 of 3, shame on your leaders, your culture, and shame on you if you're caught! ******************************************************* -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu