Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25;
Message-ID: <531A2067.5090303@abelian.org>
Date: Fri, 07 Mar 2014 19:39:19 +0000
From: Paul Nicholson <vlf0403@abelian.org>
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <BLU177-W2C98284835314933BCFFCCF8B0@phx.gbl>
In-Reply-To: <BLU177-W2C98284835314933BCFFCCF8B0@phx.gbl>
Subject: Re: LF: VLF OT
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


I don't think that's a TACAMO aircraft, at least, not performing
like the ones we pick up from time to time on 17.8kHz.

Here's a plot of the phase of a recent one

  http://abelian.org/vlf/tmp/x178.140225a.png

It is obviously in quite a nice circular orbit, and a tight one
too - so that the trailing wire antenna hangs mostly vertical.

Calculated from the phase: speed 228km/hour, orbit radius 1.17km.

On occasions we've got a rough position by trilateration of arrival
times and they've always been out over the Atlantic, not far off the
east coast.   I guess that's where you'd want to be in case you had
to cut the antenna loose.

 > A pair of Moose attacked my new VLF loop overnight

Here, sheep and cows.  I'm quite glad I don't have to deal
with Moose!
--
Paul Nicholson
--