[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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