Return-Path: Received: from mtain-mc05.r1000.mx.aol.com (mtain-mc05.r1000.mx.aol.com [172.29.96.77]) by air-da09.mail.aol.com (v129.4) with ESMTP id MAILINDA094-86934d9de5c024e; Thu, 07 Apr 2011 12:26:40 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6B16E38000148; Thu, 7 Apr 2011 12:26:36 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Q7s0z-0004Cm-KJ for rs_out_1@blacksheep.org; Thu, 07 Apr 2011 17:25:01 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Q7s0z-0004Cd-85 for rsgb_lf_group@blacksheep.org; Thu, 07 Apr 2011 17:25:01 +0100 Received: from out1.ip02ir2.opaltelecom.net ([62.24.128.238]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Q7s0x-0003Wz-0z for rsgb_lf_group@blacksheep.org; Thu, 07 Apr 2011 17:25:01 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjQCABHknU1OlmQL/2dsb2JhbAAMmGnPJ4VtBJFI X-IronPort-AV: E=Sophos;i="4.63,317,1299456000"; d="scan'208";a="361283557" Received: from unknown (HELO [192.168.2.2]) ([78.150.100.11]) by out1.ip02ir2.opaltelecom.net with ESMTP; 07 Apr 2011 17:24:52 +0100 Message-ID: <4D9DE551.9020508@talktalk.net> Date: Thu, 07 Apr 2011 17:24:49 +0100 From: qrss User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: VLF QRM puzzle - why not the same in a split screen on SL? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 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-aol-global-disposition: G x-aol-sid: 3039ac1d604d4d9de5bc7944 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hi Roger I don't fit your category, (understanding SL) however I often see this, noise from the mains I suspect, huge dirty sine waves. Considering they originate from a 50Hz source they are strongest at lower frequencies, rarely climbing above 6kHz but peaks sometimes get to 8.971kHz not much higher.. 73 Eddie G3ZJO On 07/04/2011 17:09, Roger Lapthorn wrote: > Help... > > After lunch today my wife turned on the washing machine and the tumble > drier and for two periods there was a burst of interference visible on > the lower split screen as vertical noise stripes. What I don't > understand is why I don't see these also on the upper trace around > 8.976kHz too when the settings are the same. I have a SL filter > selected but it is centred around 8.970kHz with 400Hz width and slopes > so this cannot explain this. Surely the noise bursts should appear in > both parts of the screen? > > Can someone who understands Spectrum Lab explain this please? > > 73s > Roger G3XBM > > -- > http://g3xbm-qrp.blogspot.com/ > http://www.g3xbm.co.uk > http://www.youtube.com/user/g3xbm > https://sites.google.com/site/sub9khz/ > >