Return-Path: Received: (qmail 11617 invoked from network); 27 Mar 2003 11:45:23 -0000 Content-Transfer-Encoding: 8bit Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 27 Mar 2003 11:45:23 -0000 Received: (qmail 8901 invoked from network); 27 Mar 2003 11:45:24 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 27 Mar 2003 11:45:24 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.14) id 18yVnk-0004rB-7Q for rsgb_lf_group-outgoing@blacksheep.org; Thu, 27 Mar 2003 11:44:08 +0000 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.14) id 18yVnf-0004qz-6L for rsgb_lf_group@blacksheep.org; Thu, 27 Mar 2003 11:44:03 +0000 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 18yVmb-00062j-00 for rsgb_lf_group@blacksheep.org; Thu, 27 Mar 2003 11:42:57 +0000 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 18yVmZ-0001FI-00 for rsgb_lf_group@blacksheep.org; Thu, 27 Mar 2003 11:42:55 +0000 Message-ID: <5.1.0.14.0.20030327110712.00a9e3d8@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Thu, 27 Mar 2003 11:42:54 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" In-reply-to: <1e4.55571f4.2bb379d5@aol.com> MIME-Version: 1.0 X-MailScanner: No Virus detected Subject: Re: LF: Unusual QRN Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=-9.8 required=5.0tests=EMAIL_ATTRIBUTION,IN_REP_TOversion=2.51 X-Spam-Checker-Version: SpamAssassin 2.51 (1.174.2.5-2003-03-20-exp) X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Dear Markus, LF Group At 16:47 26/03/2003 -0500, you wrote: >tonight the band seems to be plagued by a high level of background QRN. >Not the usual distinct static crashes, but rather a continous static >crackling reminiscent of old 78-rpm shellack records. This type of noise >has been present during some nights, but not often. Its southerly angle of >arrival went along well with the usual explanation of very distant >lightning activity. I have noticed similar noise on the band here also during the past few days - the background band noise seems to be ~10dB over the usual levels, swamping the Loran chatter that normally sets the noise floor, but can "switch" on and off over a period of a few minutes. It seems to occur during both the day and night time. I have been trying to record spectrograms of it; unfortunately, some local mains noise sources also produce a similar effect on the spectrogram, so it is difficult to tell which is local and which is distant, unless you are actually listening to the RX audio. I am slightly relieved it appears to be a distant natural phenomenon, rather than yet another local noise source - hopefully it is not permanent! Can anyone else hear it too? Cheers, Jim Moritz, 73 de M0BMU