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: : 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 v41E7YxK002896 for ; Mon, 1 May 2017 16:07:35 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d5BvX-0003dm-Ce for rs_out_1@blacksheep.org; Mon, 01 May 2017 15:03:47 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d5BvW-0003dd-N5 for rsgb_lf_group@blacksheep.org; Mon, 01 May 2017 15:03:46 +0100 Received: from simone.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1d5BvT-0005Jn-Fl for rsgb_lf_group@blacksheep.org; Mon, 01 May 2017 15:03:45 +0100 Received: from plato.ucs.mun.ca (plato.ucs.mun.ca [134.153.232.153]) by simone.ucs.mun.ca (8.13.8/8.13.8) with ESMTP id v41E3bS0022829 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 1 May 2017 11:33:38 -0230 Date: Mon, 1 May 2017 11:33:37 -0230 (NDT) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: rsgb_lf_group@blacksheep.org In-Reply-To: <58FE060D.8010206@posteo.de> Message-ID: References: <79fa174a-23e3-4c02-5654-ffa8905d38d8@abelian.org> <2232d14e-843d-433d-d2a8-940129c67b35@abelian.org> <58FE060D.8010206@posteo.de> MIME-Version: 1.0 X-Scan-Signature: c9d6a1e47761f7ec7375ac340bef30d0 Subject: Re: VLF: Some natural signals 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 X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11544 Hi Stefan, Amazing work on ULF. This is very inspring for for someone lamenting over yet another fried VLF helix. Undaunted, I've sought more wire to wind a new one. It is easy to lock to NAA and maybe generate a carrier on 8277 Hz? During the detection of the far field for the first time on 18 April, the Alpha stations could be seen in the 11 kHz window. Incidently I was using the DK7FC VLF probe. 73 Joe On Mon, 24 Apr 2017, DK7FC wrote: > Hi Joe, > > You could generate a separate (maybe locked to NAA) spectrogram from a local > probe to check if everything worked fine from the transmitter site. I always > found my feedback signal from the local tree grabber most useful, i'm even > feeling blind if it is not available :-) > > 73, Stefan > > Am 24.04.2017 15:52, schrieb jcraig@mun.ca: >> I really enjoyed that, Paul. Thank-you. >> >> The ice is finally melting and it may be possible to raise >> the aerial this evening. I will advise when the VLF TX is QRV again. >> >> 73 to all >> Joe VO1NA >> >> On Sun, 23 Apr 2017, Paul Nicholson wrote: >> >>> >>>> Is that recorded with antenna direct into soundcard >>>> (metaphorically speaking ) ? >>> >>> Yes. There's no frequency shift, just amplification of >>> the audio frequencies present on the E-field probe. >>> >>> Not even that much amplification, on the order of x50 voltage >>> gain before the soundcard (which needs 4 volts for full scale). >>> The only post processing is hum notching, 5 pole high pass >>> at 300 Hz and 3 pole low pass at 10kHz. >>> >>> -- >>> Paul Nicholson >>> -- >>> >>> >> > >