Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: INFN-TO: mailn 1233; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mailn.lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id uBEHOiHO022966 for ; Wed, 14 Dec 2016 18:24:46 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cHDE8-0003Ae-KG for rs_out_1@blacksheep.org; Wed, 14 Dec 2016 17:20:24 +0000 Received: from [195.171.43.34] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cHDE7-0003AV-VY for rsgb_lf_group@blacksheep.org; Wed, 14 Dec 2016 17:20:23 +0000 Received: from smarthost01c.mail.zen.net.uk ([212.23.1.5]) by relay2.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1cHDE4-0003Cl-9L for rsgb_lf_group@blacksheep.org; Wed, 14 Dec 2016 17:20:22 +0000 Received: from [82.70.254.222] (helo=OfficeWin7.lan) by smarthost01c.mail.zen.net.uk with esmtp (Exim 4.80) (envelope-from ) id 1cHDE3-000872-5V for rsgb_lf_group@blacksheep.org; Wed, 14 Dec 2016 17:20:19 +0000 Date: Wed, 14 Dec 2016 17:20:18 +0000 From: Chris Wilson Organization: Gatesgarth Developments X-Priority: 3 (Normal) Message-ID: <109827670.20161214172018@chriswilson.tv> To: Chris Wilson In-Reply-To: <342644544.20161214145409@chriswilson.tv> References: <342644544.20161214145409@chriswilson.tv> MIME-Version: 1.0 X-Originating-smarthost01c-IP: [82.70.254.222] Feedback-ID: 82.70.254.222 X-Scan-Signature: 1708620d3ce65bee0beaaede7929769a Subject: Re: LF: Circa 144kHz noise hump Content-Type: text/plain; charset=us-ascii 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: 9799 Hello Chris, Wednesday, December 14, 2016 Sorry, not sure what happened with the link, Marcus spotted the error and it should be: http://www.chriswilson.tv/HDSDR.zip Best regards, Chris 2E0ILY mailto:chris@chriswilson.tv My part time LF grabber is at http://www.chriswilson.tv/grabber.html > 14 December 2016 > Thanks to all who have helped both here and by e-mail. Turning off the > mains into the house and workshop and running my laptop on internal > battery and the IDC receiver on a 12V accumulator saw a very slight > degradation in the noise, but nothing of significance. It has been > mentioned this noise hump may be caused by a mixing of high level > signals and the way the front end of the IDC receiver is constructed. > i have had the idea of using HDSDR to record this noise in RF and AF > format. If someone using HDSDR has the time and inclination to > download the .wav file and play it on their PC maybe their experience > could suggest what it may be? HDSDR allows one to look at it in SSB or > AF or even FM modes. I recorded about a minute of it. the pulsing > noise at about 1.5 second or so intervals is the electric cattle > fence, and yes, I turned that off as a fisrt step in ID'ing it, plus > it goes off if the mains to the house is turned off. It made no > difference to the noise hump :( > The file is at: http://www.chriswilson.tv/HDSDR.zip