Re: [TSCM-L] {1864} Re: Low power devices - Fox Hunts

From: Its from Onion <areda..._at_msn.com>
Date: Tue, 21 Aug 2007 02:51:12 -0500

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Message-ID: <46CD49DC.5030101_at_phreaker.net>
Date: Thu, 23 Aug 2007 04:48:28 -0400
From: kondrak <kon..._at_phreaker.net>
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To: TSCM-L2006_at_googlegroups.com
Subject: Re: [TSCM-L] {1868} Re: Low power devices - Fox Hunts
References: <7.0.1.0.2.20070819160618.123de0e0_at_tscm.com> <46C9FC06.7050100_at_phreaker.net> <7.0.1.0.2.20070820173124.11c5f658_at_tscm.com> <46CA2E81.5050308_at_phreaker.net> <000601c7e39c$85b1e4e0$1d02a8c0_at_Starbase1>
In-Reply-To: <000601c7e39c$85b1e4e0$1d02a8c0_at_Starbase1>

We found a jammed mic on a Canadian pleasure boat in US waters, docked
at a marina a few years back. The final approach, we used a HT in a
coffee can, and a paper clip for the antenna. Led us right up to the boat.

Preflatish wrote:
> We do pretty much the same...20 watts for a County wide hunt, then down to
> 10 after a
> set time, then 1 then 1/2 etc. The way I deal with too much sig is once I
> get close I tune the
> third harmonic, and shield the receiver, works pretty well (same old TSCM
> stuff).
>
> We hold one fox hunt a month, the fox can be anywhere in the entire County,
> lots of fun.
> Doppler will work on the higher power settings, but once you get close/low
> power, then the
> good old handheld antenna comes into play. Like you say, a lot of fun.
> Our fox is remotely controllable, so last month's winner can make it pretty
> hard on
> this month's crew!
>
>
> ----- Original Message -----
> From: "kondrak" <kon..._at_phreaker.net>
> To: <TSCM-..._at_googlegroups.com>
> Sent: Monday, August 20, 2007 6:14 PM
> Subject: [TSCM-L] {1864} Re: Low power devices - Fox Hunts
>
>
>> 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
>>
>
>
> >
>
Received on Sat Mar 02 2024 - 00:57:19 CST