Re: Cool Stuff for Amateur Radio - APRS

From	2phar <none@example.com>
Newsgroups	comp.misc
Subject	Re: Cool Stuff for Amateur Radio - APRS
Date	2014-02-08 08:58 -0500
Organization	A noiseless patient Spider
Message-ID	<ld5d6a$fv9$1@dont-email.me> (permalink)
References	<ld3q2n$dnv$1@dont-email.me> <ld3r8l$ile$1@dont-email.me> <ld3ss3$rrc$1@dont-email.me> <unibrow-EC107D.07525808022014@189-82-4-46.user.veloxzone.com.br> <177155748413542868.039277bob_davis_retired-yahoo.com@news.eternal-september.org>

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On 2/8/2014 4:07 AM, Oregonian Haruspex wrote:
>
> It is possible for authorities to determine not only that you are listening
> to the radio, but also what frequency you are tuned in to.  The Germans had
> this technology in WWII, but it was very local and obvious - large detector
> vans and trench-coated goons roaming the neighborhoods.  By the time 'Nam
> rolled around, this technology had been placed aboard US airplanes which
> could detect emissions from local oscillators from many miles away.
>
> Some radios, such as basic crystal sets, that are completely passive, and
> direct conversion radios may be immune to detection but I wouldn't bet my
> life on it.  Still, detection of radios would be a lot more work than
> automated Internet surveillance.
>
> Thanks for the reply.  Your site is interesting.
>

I suspect the local oscillator snooping might not be much good with 
software defined radio. There may be similar artifacts, but wouldn't it 
be far more complex?

Thread

Cool Stuff for Amateur Radio - APRS Oregonian Haruspex <bob_davis_retired@yahoo.com> - 2014-02-07 15:26 -0800
  Re: Cool Stuff for Amateur Radio - APRS 2phar <none@example.com> - 2014-02-07 18:46 -0500
    Re: Cool Stuff for Amateur Radio - APRS Oregonian Haruspex <bob_davis_retired@yahoo.com> - 2014-02-07 16:13 -0800
      Re: Cool Stuff for Amateur Radio - APRS Massive Unibrow <unibrow@gmail.com> - 2014-02-08 07:52 +0000
        Re: Cool Stuff for Amateur Radio - APRS Oregonian Haruspex <bob_davis_retired@yahoo.com> - 2014-02-08 09:07 +0000
          Re: Cool Stuff for Amateur Radio - APRS RS Wood <rsw@therandymon.com> - 2014-02-08 11:48 +0000
          Re: Cool Stuff for Amateur Radio - APRS 2phar <none@example.com> - 2014-02-08 08:58 -0500
            Re: Cool Stuff for Amateur Radio - APRS Oregonian Haruspex <bob_davis_retired@yahoo.com> - 2014-02-08 15:10 -0800
            Re: Cool Stuff for Amateur Radio - APRS Vince Mulhollon <vincemulhollon@gmail.com> - 2014-02-10 05:41 -0800
        Re: Cool Stuff for Amateur Radio - APRS "Dirk T. Verbeek" <dverbeek@xs4all.nl> - 2014-02-08 12:17 +0000

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