Return-Path: Received: (qmail 2285 invoked from network); 6 Mar 2002 19:45:36 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 6 Mar 2002 19:45:36 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 18203 invoked from network); 6 Mar 2002 19:45:32 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 6 Mar 2002 19:45:32 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16iikS-0004y7-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 06 Mar 2002 21:14:56 +0000 Received: from hestia.herts.ac.uk ([147.197.200.9]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16iikR-0004y2-00 for rsgb_lf_group@blacksheep.org; Wed, 06 Mar 2002 21:14:55 +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 16ihDZ-0006cH-00 for rsgb_lf_group@blacksheep.org; Wed, 06 Mar 2002 19:36:53 +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 16ihDY-0005MV-00 for rsgb_lf_group@blacksheep.org; Wed, 06 Mar 2002 19:36:52 +0000 Message-ID: <5.1.0.14.0.20020306191533.00b09e08@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Wed, 06 Mar 2002 19:33:10 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" Subject: Re: LF: New interference source? In-reply-to: <000201c1c539$e92f8d60$b25901d5@default> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: At 15:49 06/03/2002 +0000, you wrote: >Hi all, I have a new 'sound' appearing on the band recently..... I had something like that once - it turned out to be coming from a computer printer that had a flashing tell-tale LED when in standby mode - it was obvious the noise and the flashing were synchronised, and it went away when the printer was unplugged. I once did some EMC measurements on PC SMPSUs which generated more noise when they were on standby than when running at full power - so it is worth looking for that kind of thing. Cheers, Jim Moritz 73 de M0BMU