Envelope-to: dave@picks.force9.co.uk Delivery-date: Fri, 06 Jan 2006 22:22:26 +0000 Received: by ptb-mxcore02.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1Euzyc-0006v4-4i for dave@picks.force9.co.uk; Fri, 06 Jan 2006 22:22:26 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (PlusNet MXCore v2.00) id 1Euzyb-0006tI-Vr for dave@picks.force9.co.uk; Fri, 06 Jan 2006 22:22:26 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Euzy0-0007ea-QF for rs_out_1@blacksheep.org; Fri, 06 Jan 2006 22:21:48 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Euzy0-0007eR-C0 for rsgb_lf_group@blacksheep.org; Fri, 06 Jan 2006 22:21:48 +0000 Received: from smtp812.mail.ukl.yahoo.com ([217.12.12.202]) by relay1.thorcom.net with smtp (Exim 4.51) id 1Ev180-0003SB-52 for rsgb_lf_group@blacksheep.org; Fri, 06 Jan 2006 23:36:28 +0000 Received: (qmail 21664 invoked from network); 6 Jan 2006 22:20:26 -0000 Received: from unknown (HELO ?213.122.122.205?) (james.moritz@btopenworld.com@213.122.122.205 with login) by smtp812.mail.ukl.yahoo.com with SMTP; 6 Jan 2006 22:20:25 -0000 Received: from 127.0.0.1 (AVG SMTP 7.1.371 [267.14.14/222]); Fri, 06 Jan 2006 22:20:05 +0000 Message-ID: <002401c6130f$5835dd00$cd7a7ad5@w4o8m9> From: "James Moritz" To: rsgb_lf_group@blacksheep.org References: <006201c612f5$a1858f10$e6668656@Beast> Date: Fri, 6 Jan 2006 22:20:04 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 Subject: LF: Re: Strange LF signals in UK? Content-Type: text/html; charset=windows-1252 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SpamFiltered: by PlusNet MXCore (v2.00) Content-transfer-encoding: 8bit

Dear Chris,

These are "Datatrak" beacons, operated by Securicor, I believe, and used for vehicle tracking. There are several located around western Europe. That is about all I know about them - does anybody have any technical info about this system?

Cheers, Jim Moritz

73 de M0BMU

----- Original Message -----

From: Chris

To: rsgb_lf_group@blacksheep.org

Sent: Friday, January 06, 2006 7:15 PM

Subject: LF: Strange LF signals in UK?

Good evening folks,

I’ve literally just joined the group today so please forgive me if my question has been answered previously…

Today, I’ve come across a strange sound on two different freqs, namely 132.5kHz and 144.5kHz on USB.

It sounds like a cross between ‘a ball-bearing rattling around the bottom of a steel bucket’ and a sonar pulse!!!

Any ideas?

Regards

Chris (grid loc:IO91kw)