Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 4154238000092; Thu, 13 Oct 2011 07:33:27 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1REJWJ-0000ku-Nk for rs_out_1@blacksheep.org; Thu, 13 Oct 2011 12:32:15 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1REJWJ-0000kl-8A for rsgb_lf_group@blacksheep.org; Thu, 13 Oct 2011 12:32:15 +0100 Received: from nina.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1REJWG-0007aK-QE for rsgb_lf_group@blacksheep.org; Thu, 13 Oct 2011 12:32:15 +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 p9DBW4hV011475 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 13 Oct 2011 09:02:04 -0230 Date: Thu, 13 Oct 2011 09:02:04 -0230 (NDT) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: rsgb_lf_group@blacksheep.org In-Reply-To: Message-ID: References: MIME-Version: 1.0 X-MUN-Disclaimer: http://www.mun.ca/cc/policies/elect_communications_disclaimer_2011.php X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55 Subject: Re: LF: VO1NA / Arcing Relays / Monopole capacitance Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_NAME 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-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:512268544:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60094e96cc862148 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dear LF Group, Thanks to ON7YD for the equation for monopole capacitance and reminding me that the 6pF/m is for thin conductors. Jim's (M0BMU) comments on relays and thick monopoles were also very helpful. I hope my maths were OK in calculating the voltages. It appears that that ~450 pF is a reasonable capacitance and that suspicions the base insulator has suffered ingress of brine water are unfounded. Thanks to all. Last night, the Decca was used briefly to feed a kW (4.5 RF amps) on 137.777016 kHz to the 100m wire by popular demand (at least F1AFJ and DK7FC anyway!) CSignal reports from RN3AGC (Moscow) 4X1RF (who also reported a reception in Bucharest) F1AFJ, PA3CM and DK7FC are gratefully acknowledged. Signals were seen on the G4WGT, DF6NM and F1AFJ grabbers. Experiments will continue with feeding 137.777 kHz to the the tower in the near future. The 507.77 kHz transmissions continue. For the benefit of K2ORS and others who are curious, the power is 80 watts, 1.5 amps to the tower via 200 uH. The 500 kHz TX hissed loudly when the Decca was keyed so it was switched off temporarily during the 137 kHz operation last night. 73 Joe This electronic communication is governed by the terms and conditions at http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2011.php