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Re: Do jammers work? NO Audi content
In a message dated 09/03/1999 12:54:57 PM Eastern Daylight Time,
kurt.wesseling@nexusmgmt.com writes:
> SOME jammers work,some don't. If you have an RF source more powerful than
> the RADAR gun, on the proper freq, it'll work. The signal you're
> transmitting just has to be strong enough to override the X, K or Ka band
> RADAR signal. I built an X-band jammer about 15 years ago using a 100mW
> 10.5 Ghz GUNN diode and a 555 chip set up as an audio oscillator.
>
> Principle is simple enough. RADAR guns (at least the old ones) calculate
> the Doppler shift between the signal they transmit and the one that is
> reflected back off the object they are illuminating. The frequency shift
> difference is converted to your mph. All you have to do is inject the
> proper shift frequency onto the RF carrier at the RADAR frequency you want.
> Using this method, you can make the RADAR read anything you want. I tested
> mine after I built it on an old X-band traffic unit I had given to me by a
> friend who worked at the local PD. It really did work. The read out on
the
> RADAR unit was 53 mph no matter how fast, or slow I was going.
>
> Of course these days hardly anyone uses X-band anymore, so the jammer is
> pretty much useless...except to set off the RADAR detector in the cab of
> that truck that's two feet from your bumper! I've had some fun with people
> who wanted to pass me. Let them go by, hit the transmit switch, watch the
> brake lights, they get brave again, pass me...hit the transmit switch..etc,
> etc,etc. Great fun ! 8-]
>
> Since I have an amateur radio license and am authorized to transmit in the
> 10.5 Ghz range, I always thought I could explain to a judge that my 10.5
Ghz
> "transmitter" COULD have been causing interference to the REO's RADAR.
> Never had the opportunity to test that theory, though.
>
> "Will I build one for you?" NO. No longer have the parts, or the time.
>
> --Kurt
> NØBGS/1
> '89 200 TQ
Kurt,
I have been out of the amateur radio for so long that I don't remember the
exact FCC reg... but causing intentionally causing interference on any
frequency is illegal. Hence, the use of jammers for cop radar/laser would
also be illegal. It was posted previously that these were legal in 45 states
and I don't see how it is possible...
Do you recall what the exact reg was that I was referring to?
73s
Arden
WF2P
85 5Ks