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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD,SPF_PASS 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 u2JK216D029178 for ; Sat, 19 Mar 2016 21:02:01 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ahMw1-0002Is-RA for rs_out_1@blacksheep.org; Sat, 19 Mar 2016 19:53:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ahMw1-0002Ij-Dc for rsgb_lf_group@blacksheep.org; Sat, 19 Mar 2016 19:53:17 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ahMvz-0002TR-Sk for rsgb_lf_group@blacksheep.org; Sat, 19 Mar 2016 19:53:16 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 889AA3273E4 for ; Sat, 19 Mar 2016 19:53:00 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 54C1228A0112 for ; Sat, 19 Mar 2016 19:53:14 +0000 (UTC) Message-ID: <56EDAE29.8040009@abelian.org> Date: Sat, 19 Mar 2016 19:53:13 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <56E526C8.5010401@abelian.org> <1536f9e8813-7821-7aea@webprd-m99.mail.aol.com> <56E5DCEF.4050905@abelian.org> <56E7090D.4090601@tiscali.co.uk> <56E7122E.1090907@abelian.org> <016f01d17e34$65318b80$2f94a280$@comcast.net> <56EAF20F.7050008@abelian.org> <56EB0D46.8010500@posteo.de> In-Reply-To: <56EB0D46.8010500@posteo.de> X-Scan-Signature: 4b5b5ebe37a4c4f430f59bc35c1947b0 Subject: Re: LF: EbNaut from Todmorden Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 7417 Peter wrote: > End of World is Nigh ... A pal at Uni (quite a party animal) often used to say - if anything's worth doing, it's worth doing to extremes. I've often taken that as sound advice. Stefan wrote: > It's a big fun, you know. Remember my earth antenna in > the forst :-) Indeed yes, and I think I received a little signal from it. Today I ran out 500m of wire and terminated the remote end in a convenient bog. Not the km I was thinking of but it'll do for a start. The resistance of the ground loop through the wire and back to the domestic ground is 380 ohms. It is virtually all resistance, I can see a slight phase shift of the test current but not enough to measure the reactance accurately. That's a pity. If I knew the inductance I could estimate the effective area of the one turn ground loop. Anyway the loop impedance is flat up to 2MHz where there is a very slight peak. I got the amplifier fired up. It's quite a beast, rated 5kW into 4 ohm. Actually I've got two of these but one will do for now. I reckon about a 20 turn primary around that monster toroid will match a kW or two via the 400t secondary into the earth loop. I don't know if I'll get it rigged up tonight but maybe tomorrow evening I might be able to do a 'large signal impedance measurement'. I guess this isn't going to radiate very well but it's fun to try. If any of the neighbours ask why the ground is steaming I'll just tell them about the heavy duty mole repeller I'm working on. -- Paul Nicholson --