Article View: sci.electronics
Article #3942Re: the undetectable radar detector
From: Bill Katz
Date: Sat, 02 Dec 1989 02:57
Date: Sat, 02 Dec 1989 02:57
30 lines
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2049 bytes
Brent Beseler writes:
>Would the following idea work:
>
>Suppose the reciever horn of a detector is mounted in front of the engine grill
>etc. in a hidden location. Right behind the horn would be a microwave amplifie
>r circuit. That would feed into a cable. The cable would run to a well shield
>ed reciever. This system would not emit the 11.5 Ghz frequency that the
>radar detector detection systems use.
> Brent H. Besler
> FOrd Motor Scientific Res. Lab
Yes, it is possible for a system such as you describe to be built
that would not radiate the local oscillator. In addition to a preamp, a
filter would also help. (You would ideally have a separate filter/preamp/
mixer for each band) As you state you would also need a well shielded
receiver. This is a non-trivial task, depending on how close you want to
be able to get without your LO being detected. Shielding 11GHz effectively
is tough, but can be done. I doubt it can be done at the prices they sell
commercial radar detectors for.
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!ucsd!ucsdhub!hp-sdd!hplabs!hpl-opus!hpnmdla!hpsad!billk From: billk@hpsad.HP.COM (Bill Katz) Newsgroups: sci.electronics Subject: Re: the undetectable radar detector Message-ID: <1840016@hpsad.HP.COM> Date: 2 Dec 89 02:57:30 GMT References: <89333.113354BHB3@PSUVM.BITNET> Organization: HP Signal Analysis Division - Rohnert Park, CA Lines: 30