Return-Path: X-Spam-DCC: paranoid 1102; 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 tARJxpLX027821 for ; Fri, 27 Nov 2015 20:59:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a2P8Y-0005Pt-Qu for rs_out_1@blacksheep.org; Fri, 27 Nov 2015 19:56:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a2P8Y-0005Pk-JP for rsgb_lf_group@blacksheep.org; Fri, 27 Nov 2015 19:56:54 +0000 Received: from nina.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.86) (envelope-from ) id 1a2P7V-0005VE-49 for rsgb_lf_group@blacksheep.org; Fri, 27 Nov 2015 19:56:53 +0000 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 tARJtUEM025795 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 27 Nov 2015 16:25:30 -0330 Date: Fri, 27 Nov 2015 16:25:30 -0330 (NST) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: rsgb_lf_group@blacksheep.org In-Reply-To: <8D2F6BC4F451A9F-14C8-11CB41@webmail-vd001.sysops.aol.com> Message-ID: References: <8D2F6BC4F451A9F-14C8-11CB41@webmail-vd001.sysops.aol.com> MIME-Version: 1.0 X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: LF: More EbNaut 137.777 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: 5370 Hi Markus, My aerial current is 170mA so 3.5 uW on 8.3 kHz! Nice Eb/No values, Markus. Getting ready to start EbNaut again, hopefully with the timing offset reduced. Intended start time 2000 UTC. CHU weak on 7850 kHz -- hopefully reflex time is good. 73 Joe VO1NA On Thu, 26 Nov 2015, Markus Vester wrote: > >> How can I estimate Rrad for a 100m wire at 10 m average height on 8.3 kHz?? > 1579 ohms * (10 m / 36145 m) = 121 microohms > ? > Joe, if you wanted you could almost copy Stefan's VLF coil described on his website, using thin enameled wire on a large water barrel. > Assuming your antenna can withstand 28 kV rms, you could run 0.8 A which would instantly put you into the TA playground with Paul. > ? > 73, Markus > ? > PS. 20 dB more will get you 10 times as far (at least in free space ;-)