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=-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 u27Kfesh029309 for ; Mon, 7 Mar 2016 21:41:40 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ad1sg-0007Ge-GV for rs_out_1@blacksheep.org; Mon, 07 Mar 2016 20:35:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ad1sZ-0007GV-OW for rsgb_lf_group@blacksheep.org; Mon, 07 Mar 2016 20:35:47 +0000 Received: from brian.netcom.co.uk ([217.72.171.64]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ad1sY-0002A8-7U for rsgb_lf_group@blacksheep.org; Mon, 07 Mar 2016 20:35:46 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by brian.netcom.co.uk (Postfix) with ESMTP id EAAE632008B for ; Mon, 7 Mar 2016 19:49:22 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id C2EF028A0109 for ; Mon, 7 Mar 2016 20:35:43 +0000 (UTC) Message-ID: <56DDE61F.90508@abelian.org> Date: Mon, 07 Mar 2016 20:35:43 +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" X-Scan-Signature: 0b2d339ae1d48966556dfb6ad64e2bce Subject: 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: 7244 Today saw another 200m of wire added to the long wire antenna. Its impedance dips to a minimum of 70 ohms at about 170kHz corresponding to a free-space quarter wavelength of 440m which is somewhat less than my estimated total length of wire. 100uH in series brings it into tune at about 135kHz and presents an impedance of 50 ohms and the tuning is quite broad, I don't think I need a variable inductance. Can anyone advise a good frequency on which to test which won't get in anyone's way? I expect to be using symbols one second or longer. -- Paul Nicholson --