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=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_MED,SPF_PASS, SUBJ_ALL_CAPS,T_DKIM_INVALID 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 v4AJouTa005454 for ; Wed, 10 May 2017 21:50:57 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d8XZ7-0000Rq-Kf for rs_out_1@blacksheep.org; Wed, 10 May 2017 20:46:29 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d8XYe-0000Re-4A for rsgb_lf_group@blacksheep.org; Wed, 10 May 2017 20:46:00 +0100 Received: from resqmta-ch2-06v.sys.comcast.net ([2001:558:fe21:29:69:252:207:38]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1d8XYa-0002Om-RO for rsgb_lf_group@blacksheep.org; Wed, 10 May 2017 20:45:58 +0100 Received: from resomta-ch2-15v.sys.comcast.net ([69.252.207.111]) by resqmta-ch2-06v.sys.comcast.net with SMTP id 8XY6dcFB2l4eq8XYWd33wS; Wed, 10 May 2017 19:45:52 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1494445552; bh=WGPAoise+5kp0RFNjBjVp7J+TPKCp9/QCtM9P4U8wcU=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=U5w3w7Prb+YIal5bd8ItTgAxc5MlATNDUGkFEei6qkXgl2SUa7n2d1bZrhOnO5/FV GrXmfIsEUw4Gwmjs5TBE0zD+mFzsLhqgDOsUpPqQDFjfnuNIrkoyAexZJ2n+KXwfTN ZfuvMdo/STPfqywhfNjOKcE/q5Qn3jKBoSlJpOjUu8MUkNmSqpCJel29HPxk8UYvN5 9GWg9s7ENbrT65LpDLg5nsYRvDEILofWhuMMIdwYbVKdfdjzAwSV3HjvVGs6c8ds7U MXj7etARfWyBpXSDviR5lAnnKQOtiiEGN0yt3zkDfGDFf2m8LoKDjGCi3LFmETnUeO X/HpOmrgrx5sw== Received: from Owner ([IPv6:2601:140:8500:7f9f:b99f:7186:f7be:d8ed]) by resomta-ch2-15v.sys.comcast.net with SMTP id 8XYMdsHg3XTPj8XYNd8hhq; Wed, 10 May 2017 19:45:51 +0000 From: To: References: <579355A36AEE9D4FA555C45D556003AB8FDD9B58@servigilant.vigilant.local> <4e6f6fae-c71c-66e5-8c0d-c984f156b8bf@abelian.org> <910afef0-57f2-d4b0-a077-86325d594f3f@abelian.org> <57b0f48d-4a3c-3d5d-bf4e-5a836872e7eb@abelian.org> <4cfe080a-7823-cc38-e2a5-8484bb7d1be1@abelian.org> In-Reply-To: Date: Wed, 10 May 2017 15:45:38 -0400 Message-ID: <049401d2c9c6$050077b0$0f016710$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQK4xRBKdUpPgTiF6oUV7l/qL5qVbgIA5EQJAhsM8ZcC/tdTQQFu37DgAjMvZ7sC8gbWbgH89l5/AQRk/a6fnHmAkA== Content-Language: en-us X-CMAE-Envelope: MS4wfPC6Xkj0B46pSvw1TAmHJawCC/aPDeIxJ8s5BDedb97ihfO+NwrSMqHrGbBjbiKRWvLlZzYa2F6xPbe5/3m/HOOksUbeumBoxi/vdyFaZNlAXr46OaKT w0pOiSaPYVXUUPkiwwLfcJLO72YWoEqd0+0= X-Scan-Signature: 7ab87d4d3ea1d9dcb73a78e83fe4d608 Subject: RE: LF: NA VLF 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: RO X-Status: X-Keywords: X-UID: 11659 Joe mentioned: "Could part of this fluctuation be from propagation?" Joe and Paul, For your consideration and (with your permission) my edification have we seen natural-propagation-related frequency changes on this timescale? The only generally acknowledged example of substantial propagation-related frequency changes (from all-natural processes) that I've seen is ~ 20mHz rms spreading of VLF signals during strong geomagnetic storms*, which might not even be a 50-second wander (too fast to show up at recent VO1NA signal integration times), but could even be simultaneous modulation at frequencies distributed over 20mHz rms (which also would not be visible given recent TA-signal integration times). Incidentally the magnetic field has been basically quiet during the TA tests. So I'm asking Joe's question and adding a bit (driven by longstanding curiosity): does the experience base include examples of propagation-related frequency changes (from all-natural processes) on this timescale? * "Subionospheric VLF measurements..." (W. B. Peter, U. S. Inan - 2005) Thanks, Jim AA5BW -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of jcraig@mun.ca Sent: Wednesday, May 10, 2017 1:54 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: NA VLF Great news, Paul. The frequency is a bit enigmatic. It had always been a few ppb low since calibration in 2013 but is evidently bouncing above and below. Could part of this fluctuation be from propagation? The sigs will continue until the helix sparks or the wx grounds the aerial. TNX & 73 Joe VO1NA On Wed, 10 May 2017, Paul Nicholson wrote: > > A nice signal from VO1NA overnight 9th/10th. Happy to see the signal > on the right frequency 8270.007093 Hz and back to 0.06 fT flux > density. > > -- > Paul Nicholson > -- > >