Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, NO_REAL_NAME autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t4F281eA004434 for ; Fri, 15 May 2015 04:08:01 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Yt4zf-0000On-Ui for rs_out_1@blacksheep.org; Fri, 15 May 2015 03:04:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Yt4zf-0000Oe-Cm for rsgb_lf_group@blacksheep.org; Fri, 15 May 2015 03:04:55 +0100 Received: from nina.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from ) id 1Yt4zd-0008W5-EK for rsgb_lf_group@blacksheep.org; Fri, 15 May 2015 03:04:54 +0100 Received: from plato.ucs.mun.ca (plato.ucs.mun.ca [134.153.232.153]) by nina.ucs.mun.ca (8.13.1/8.13.1) with ESMTP id t4F24n59020749 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 14 May 2015 23:34:49 -0230 Date: Thu, 14 May 2015 23:34:49 -0230 (NDT) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: rsgb_lf_group@blacksheep.org In-Reply-To: <55552377.70808@posteo.de> Message-ID: References: <5553C81D.8000606@posteo.de> <5553C9E1.6060406@posteo.de> <55548F04.8060204@posteo.de> <55551D0D.8080905@posteo.de> <55552377.70808@posteo.de> MIME-Version: 1.0 X-Scan-Signature: a6b6ffaf48fdddf1ed5c25dc4bf03ee1 Subject: Re: VLF: Joe on DX 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3118 Hi Stefan, 30 watts from an audio amp is stepped up with a 1:4 ferrite xfmr. One end of the secondary is grounded, the other goes to 2 pie coils wound with 3 strands of 0.08mm wire, L~450 mH R(DC)=437 The 100m wire is about 12 m average height and the aerial current is about 20mA, with a large uncertainty. 5 km is the best DX, with about 10dB S/N at 3.3km. I recall Markus or you posted the maths for erp vs natural noise on 8 kHz. A reminder would be most helpful! The 10k race was most gratifying even if I couldn't catch my pretty little physiotherapist! 73 & TNX Joe VO1NA On Fri, 15 May 2015, DK7FC wrote: > R Joe, thanks. > > Now, what is your setup on VLF? Are you using a 100m wire which you are using > for LF/MF as well? > > What is the effective height and what is the antenna current? How do you > couple the TX to the wire and what is the output power? > > 73, Stefan > > Am 15.05.2015 00:29, schrieb jcraig@mun.ca: >> [...] >> >> Your VLF probe design works well -- but sadly the 36km photons >> remain elusive. >> >> 73 >> Joe VO1NA > >