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Article #16048Re: Wanted RADAR kit, was (Re: Measuring vehicle speed)
From: Edwards Thomas G S1A x8297
Date: Thu, 27 Jun 1991 18:58
Date: Thu, 27 Jun 1991 18:58
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In article <1840053@hpsad.HP.COM> frankb@hpsad.HP.COM (Frank Ball) writes: >> Ramsey Electronics sells a radar speed indicator kit for under $100. >Just what is this kit? Is is really RADAR? or is it SONAR (ultrasonic)? >or maybe LASER (with a diode?)? Negative. It is a real working radar. I have seen a static display of it working at a HamFest. If you wave your hand back and forth at high speed in front of the "gun" made from the tennis ball can, you can see your hand speed displayed. I assume it is just a little gunn oscillator, and you mix the return with the xmitted signal (either electronically or in the waveguide...I don't do microwaves) and it looks at the sum or difference frequency and converts it to a speed. I have no idea how accurate this thing is, or how much range it has, but they claimed it could be used for measuring speeds of passing cars. -Tom
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!spool.mu.edu!uunet!aplcomm!tedwardsReferences:
<1991Jun24.205716.29809@cci632.cci.com> <1840053@hpsad.HP.COM>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!spool.mu.edu!uunet!aplcomm!tedwards From: tedwards@aplcomm.JHUAPL.EDU (Edwards Thomas G S1A x8297) Newsgroups: sci.electronics Subject: Re: Wanted RADAR kit, was (Re: Measuring vehicle speed) Summary: Yes, it's a real radar Message-ID: <470@aplcomm.JHUAPL.EDU> Date: 27 Jun 91 18:58:35 GMT References: <1991Jun24.205716.29809@cci632.cci.com> <1840053@hpsad.HP.COM> Reply-To: tedwards@aplcomm.jhuapl.edu (Edwards Thomas G S1A x8297 ) Organization: JHU/APL, Laurel, MD Lines: 17