Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS,SUBJ_ALL_CAPS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v3DIsv3J015188 for ; Thu, 13 Apr 2017 20:54:58 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cyjq8-00064N-8G for rs_out_1@blacksheep.org; Thu, 13 Apr 2017 19:51:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cyjq7-00064E-Nc for rsgb_lf_group@blacksheep.org; Thu, 13 Apr 2017 19:51:31 +0100 Received: from smtp-out-1.talktalk.net ([62.24.135.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1cyjq5-0006zD-51 for rsgb_lf_group@blacksheep.org; Thu, 13 Apr 2017 19:51:30 +0100 Received: from [192.168.1.3] ([78.150.101.242]) by smtp.talktalk.net with SMTP id yjq4cTOcn0Kuvyjq4cb6zP; Thu, 13 Apr 2017 19:51:28 +0100 X-Originating-IP: [78.150.101.242] X-Spam: 0 X-OAuthority: v=2.2 cv=RZjSMBlv c=1 sm=1 tr=0 a=zSPPKdXLYhWsOVDzq1e+mg==:117 a=zSPPKdXLYhWsOVDzq1e+mg==:17 a=N659UExz7-8A:10 a=1bYWTGcaMl3D6V2CxqMA:9 a=pILNOxqGKmIA:10 To: rsgb_lf_group@blacksheep.org References: <58EA2389.9070107@posteo.de> <519a2968-f0e0-e779-a1e9-c3e1e0085ba8@psk31.plus.com> <58EB9AA6.1010804@posteo.de> <58EF8446.9020409@posteo.de> From: g3zjo Message-ID: Date: Thu, 13 Apr 2017 19:51:30 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <58EF8446.9020409@posteo.de> X-Antivirus: Avast (VPS 170413-0, 13/04/2017), Outbound message X-Antivirus-Status: Clean X-CMAE-Envelope: MS4wfCQU161En6QBD60G4wBwj5PT4hIrmBMR/osGfivUNDNe+CrZGHATsF1wgWgszWUJQ+gUIsu1EDaIJBDExA0O024C6SfeIU2vVFN9Yl/1sk2LtKUy8NrF gxPYDCcxRQ7KlZYEPejDASlMcj7B6s2Y8SwFFsHjKljcsLugXkEUybcdND7SqpbAprsUMYtcwUh+Zg== X-Scan-Signature: 4ead635eadbaebfaa92cfec77deb715d Subject: Re: VLF: DFCW-6000 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.75 Status: O X-Status: X-Keywords: X-UID: 11267 On 13/04/2017 14:59, DK7FC wrote: > ...you may ask the neighbours to place a wire antenna close to their > house, picking up strong E fields :-) These signals fed to a JFET > source follower, then use a transformer somewhere in your RX chain and > add some turns on this transformer (0/180 deg switchable) for the > compensation from the noise pick up antenna. That sounds feasible for a single source location. Unfortunately I think there are at least four sources locally of what we see up to 7kHz plus. I definitely know the source of the strongest band of QRM that covers from 1.5 to 4kHz it can be seen (white) along with at least one other which are similar on my wide spectrogram. Today it started with its normal spike just after 06:00, normally it would go off at 16:00 to 17:00. It is my neighbour to the north, the QRM follows his working days. No need for permission for a sense antenna I have a mast screwed to his office wall :-) Another experiment for when I have some spare time :-) 73 Eddie G3ZJO