Return-Path: Received: from rly-db01.mx.aol.com (rly-db01.mail.aol.com [172.19.130.76]) by air-db06.mail.aol.com (v121.4) with ESMTP id MAILINDB064-aa3482db76d165; Fri, 16 May 2008 12:34:00 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db01.mx.aol.com (v121.5) with ESMTP id MAILRELAYINDB011-aa3482db76d165; Fri, 16 May 2008 12:33:52 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Jx2ro-0008U3-W1 for rs_out_1@blacksheep.org; Fri, 16 May 2008 17:33:12 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Jx2ro-0008Tu-JK for rsgb_lf_group@blacksheep.org; Fri, 16 May 2008 17:33:12 +0100 Received: from mtaout01-winn.ispmail.ntl.com ([81.103.221.47]) by relay2.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Jx2rl-00015t-9y for rsgb_lf_group@blacksheep.org; Fri, 16 May 2008 17:33:12 +0100 Received: from aamtaout02-winn.ispmail.ntl.com ([81.103.221.35]) by mtaout01-winn.ispmail.ntl.com with ESMTP id <20080516163643.HCRX14647.mtaout01-winn.ispmail.ntl.com@aamtaout02-winn.ispmail.ntl.com> for ; Fri, 16 May 2008 17:36:43 +0100 Received: from [192.168.2.33] (really [82.5.254.204]) by aamtaout02-winn.ispmail.ntl.com with ESMTP id <20080516163544.HVTF17393.aamtaout02-winn.ispmail.ntl.com@[192.168.2.33]> for ; Fri, 16 May 2008 17:35:44 +0100 From: "Mike Dennison" To: rsgb_lf_group@blacksheep.org Date: Fri, 16 May 2008 17:32:58 +0100 MIME-Version: 1.0 Message-ID: <482DC54A.4041.18CD6C2@mike.dennison.ntlworld.com> In-reply-to: References: <482CBF61.3010505@ukonline.co.uk>, <002701c8b734$9cefe910$6401a8c0@asus>, X-mailer: Pegasus Mail for Windows (4.41) Content-description: Mail message body X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: RE: LF: RE: Antenna wire Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 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-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : ? On 16 May 2008 at 7:08, Laurence KL1X wrote: > ..........I never had to deal > with open wire spans by the time of my apprecticeship but I think > that was very similar physically. There was some open wire around when I was a BT (Post Office) apprentice. It was solid copper wire. As I recall, dropwire (steel with a thin copper coating) had a limit to its usable length because it had a higher DC resistance than open wire. This resistance may not be high in relation to other losses on an LF Marconi, but it would rule out its use in a transmitting loop antenna. Mike, G3XDV ==========