Return-Path: Received: (qmail 892 invoked from network); 22 Jun 2002 09:22:56 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 22 Jun 2002 09:22:56 -0000 Received: (qmail 12621 invoked from network); 22 Jun 2002 09:22:32 -0000 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 22 Jun 2002 09:22:32 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17Lh1w-000566-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 22 Jun 2002 10:18:04 +0100 Received: from smtp2.ihug.co.nz ([203.109.252.8] ident=mail) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17Lh1u-000561-00 for rsgb_lf_group@blacksheep.org; Sat, 22 Jun 2002 10:18:02 +0100 Received: from p42-max12.chc.ihug.co.nz (athlon) [203.173.226.170] by smtp2.ihug.co.nz with smtp (Exim 3.22 #1 (Debian)) id 17Lh1a-0001gk-00; Sat, 22 Jun 2002 21:17:43 +1200 Message-ID: <01bc01c219cd$afdb2540$0101a8c0@athlon> From: "Dave Brown" To: rsgb_lf_group@blacksheep.org References: <62.2183761c.2a45723b@aol.com> Subject: Re: LF: More Info? - Re: Strange signals on 25 Hz (!) - any info ? Date: Sat, 22 Jun 2002 21:17:51 +1200 MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit

From Cesare I5TGC:
> The Signal you receive is like a telephon call, some old systems use a 25 Hz a.c.
> with one second duration and 4 seconds space. Nevertheless it is very difficult
> that these signals can reach your receiver.

Not difficult to hear if someone has a PABX not far from the ELF antenna- and the bigger the antenna then probably the further away it can be.

I can hear the ringing from my own PABX (with a similar mark/space ratio to that described) from ELF all the way up through most of the HF range on a variety of antennas and receivers.

Dave

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