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Date: Tue, 21 Aug 2007 20:38:33 -0400
To: TSCM-L2006_at_googlegroups.com
From: "James M. Atkinson" <jm..._at_tscm.com>
Subject: Re: [TSCM-L] {1864} Re: Low power devices - Fox Hunts
In-Reply-To: <46CA2E81.5050308_at_phreaker.net>
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When I was involved in my first fox hunt the group leader also called
it "Spy Hunt" and explained to us the history of what he did back
during WWII hunting down spies through technical means when they went
on the airwaves with their suitcase radio's to give agent reports
back to the Nazi's. It got the kids (nerds and geeks) all excited
about the Fox Hunt from a technical perspective, and it was used as a
teaching tool. After several successful hunts those involved paid
much closer attention to their technical studies to help them in the next hunt.
-jma
At 08:14 PM 8/20/2007, kondrak wrote:
>We did one, where we initially beaconed for 15 minutes with 100 watts, a
>county away from the starting point.
>After 15 minutes, we dropped to 30 watts, for 20 minutes, then 5 watts,
>and finally down to 100 mw. We didn't go any further down in power,
>because the fox was located in a 1 gallon bleach bottle, under a dock on
>the riverside.
>The interesting thing is most hunters are not prepared for too much
>signal. Without attenuation, you cant make reliable fixes due to
>multi-path. I designed a signal detector, that gave an audio output
>based on signal strength, with 80db of attenuation, all switchable in 1
>db increments. Yes those were fun days....
>Yes its amazing how the fun things we did play into more practical
>skills now...
>
>James M. Atkinson wrote:
> > Since I grew up in a Coastal New England community I used to go on
> > Fox Hunts in the White Mountains, in the Osippee area, and around
> > Mount Desert Island. Didn't really care for hunting around the lakes
> > and marshes, and likes the mountains and coastline better.
> >
> > The ones I enjoyed the most involved an unknown frequency, unknown
> > locations, but a quasi unknown time transmitting where it chirped, so
> > the first thing you had to do is figure out the timing duration and
> > frequency before you could do anything else. Then it was
> > rush-like-hell to a second location to capture a second chirp to DF
> > to get a little closer, and then spiral in on the fox.
> >
> > I also liked the ones where we started 10 miles away from the fox,
> > but each time the fox transmitted the power levels dropped so you had
> > to move fast because you only had a 4 hour window or less before the
> > fox died as the power level dropped to the noise floor.
> >
> > The ones that started on an HF frequency where loads of fun where a
> > helium balloon was used to hold up a long wire antenna for the first
> > hour, then the balloon would get released, and the fox switched to a
> > different transmitter, on a different frequency, and then an hours
> > later another switch, and so on.
> >
> > The losers bought dinner and/or movies for the winners, and the
> > winners got to help the hunt masters (or game warden is you will)
> > plant the next fox.
> >
> > I never had any interest in the building and planting the fox, but
> > enjoyed the hunt more then anything else, especially when it you
> > could not use radios for communications and had to sneak up on the
> > fox from some distance away.
> >
> > I don't recall any of the foxes being more then a couple of Watts,
> > and recall that the best ones would drop below 100 mW by the time the
> > hunters got within a mile, and under 10 mW within a quarter mile.
> >
> > -jma
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Received on Sat Mar 02 2024 - 00:57:19 CST