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=4 Fuz1=4 Fuz2=4 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 v4T9tp5I027185 for ; Mon, 29 May 2017 11:55:53 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dFHK6-0002mI-U5 for rs_out_1@blacksheep.org; Mon, 29 May 2017 10:50:50 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dFHK6-0002m9-GD for rsgb_lf_group@blacksheep.org; Mon, 29 May 2017 10:50:50 +0100 Received: from lethe.lipkowski.org ([178.32.151.135] helo=lipkowski.org) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dFHK3-0008M9-5G for rsgb_lf_group@blacksheep.org; Mon, 29 May 2017 10:50:49 +0100 Received: from mailn.lipkowski.org (localhost [127.0.0.1]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v4T9p8uh027164 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 29 May 2017 11:51:09 +0200 Received: from localhost (sq5bpf@localhost) by mailn.lipkowski.org (8.14.4/8.14.4/Submit) with ESMTP id v4T9p7f8027160 for ; Mon, 29 May 2017 11:51:08 +0200 X-Authentication-Warning: mailn.lipkowski.org: sq5bpf owned process doing -bs Date: Mon, 29 May 2017 11:51:07 +0200 (CEST) From: Jacek Lipkowski To: rsgb_lf_group@blacksheep.org In-Reply-To: <5153ab2e-39ad-3178-3d31-b06dcdf14af5@abelian.org> Message-ID: References: <0efb6950-4bf2-4c0e-f951-82d9f32356cc@virginbroadband.com.au> <5153ab2e-39ad-3178-3d31-b06dcdf14af5@abelian.org> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.75 X-Scanned-By: MIMEDefang 2.75 on 10.1.3.10 X-Scan-Signature: 1f795a2ee1ecd56682b47ad11969b3d3 Subject: Re: LF: 82 Hz signal Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed 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 Status: O X-Status: X-Keywords: X-UID: 11812 On Mon, 29 May 2017, Paul Nicholson wrote: > I don't see these 90Hz and 92Hz signals here this > morning, 06:00 to 08:30 UT. Nothing in the range > 87.5 to 92.5 Hz. then most probably it's intermodulation or it could also be a local signal (although most local interference signals aren't that stable). > Zevs is strong here, this is yesterday > > http://abelian.org/vlf/tmp/170529a.png what do you use for making these long spectrograms? vtsidgram? jacek