Return-Path: Received: (qmail 15600 invoked from network); 1 Nov 2001 13:30:42 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 1 Nov 2001 13:30:42 -0000 Received: (qmail 23425 invoked from network); 1 Nov 2001 13:30:33 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 1 Nov 2001 13:30:33 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 15zHpf-0007Nx-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 01 Nov 2001 13:24:31 +0000 Received: from sun4.scgroup.com ([192.55.122.7]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 15zHpd-0007Ns-00 for rsgb_lf_group@blacksheep.org; Thu, 01 Nov 2001 13:24:30 +0000 Received: from parissn2 (AMontsouris-101-1-3-195.abo.wanadoo.fr [193.252.108.195]) by sun4.scgroup.com (8.9.1b+Sun/8.9.1) with SMTP id FAA18202 for ; Thu, 1 Nov 2001 05:23:40 -0800 (PST) Message-ID: <001101c162d8$6ef36f30$0400000a@parissn2> From: "Stewart Nelson" To: rsgb_lf_group@blacksheep.org References: <200111010724_MC3-414D-935B@compuserve.com> Subject: LF: Re: "Weak CW" on 136.000 Date: Thu, 1 Nov 2001 14:23:43 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit 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: Hi all, 136 kHz = 17 * 8 kHz. Almost anything to do with telephony has a frame rate of 8 kHz, including T1/E1, ISDN, and xDSL. The old style carriers used multiples of 4 kHz. So what you are seeing is not at all surprising. It would be interesting, for confirmation, if you observed similar signals at, say, 19 * 8 = 152 kHz (or another such harmonic where the band is quiet). 73, Stewart KK7KA > Hello LF group, > > >The spread in frequencies and the amount of drift would be > >consistent with an assortment of crystal oscillators on the same > >nominal frequency - perhaps it is a harmonic of some popular baud > >rate or similar? > > ... I made the observation that whenever I use my ISDN phone line I have a > carrier on 136.000 kHz (I did not check the exact frequency, though). > > Best 73 > > Geri, DK8KW (W1KW) > >