X-GM-THRID: 1229627323861453001 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.115.73.6 with SMTP id a6cs194868wal; Wed, 28 Feb 2007 04:36:56 -0800 (PST) Received: by 10.67.28.4 with SMTP id f4mr507209ugj.1172666215657; Wed, 28 Feb 2007 04:36:55 -0800 (PST) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id s1si424627uge.2007.02.28.04.36.54; Wed, 28 Feb 2007 04:36:55 -0800 (PST) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1HMNyy-0005Ck-N2 for rs_out_1@blacksheep.org; Wed, 28 Feb 2007 12:32:32 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1HMNyy-0005Cb-A3 for rsgb_lf_group@blacksheep.org; Wed, 28 Feb 2007 12:32:32 +0000 Received: from mailfe03.swip.net ([212.247.154.65] helo=swip.net) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1HMNyv-0000Oz-DU for rsgb_lf_group@blacksheep.org; Wed, 28 Feb 2007 12:32:32 +0000 X-Cloudmark-Score: 0.000000 [] Received: from [62.20.250.132] (account mr99641@tele2.se HELO [192.168.1.136]) by mailfe03.swip.net (CommuniGate Pro SMTP 5.0.12) with ESMTPA id 432567798 for rsgb_lf_group@blacksheep.org; Wed, 28 Feb 2007 13:32:19 +0100 Message-ID: <45E57654.1000702@tele2.se> Date: Wed, 28 Feb 2007 13:32:20 +0100 From: Johan Bodin User-Agent: Thunderbird 1.5.0.9 (Windows/20061207) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <009c01c755e8$85abf040$ea196a58@wgt01> <01b201c755f2$3e9afde0$7900a8c0@athlon1200> <000001c75b2e$d0b84930$7900a8c0@athlon1200> In-Reply-To: <000001c75b2e$d0b84930$7900a8c0@athlon1200> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Protecting E probe antennas in near field of LF TX antennas Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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 Status: O X-Status: X-Keywords: X-UID: 2517 Yes, I am using a small relay in my E-probe antenna. It connects the whip to ground when power is removed. I did not notice any change in sensitivity after adding the relay (although I did not measure it). The relay adds only a pF or so which is quite small compared to the whip//FET capacitance in my antenna. Dave Brown wrote: > Has anyone done anything along the lines of the subject line using a > mechanical switch/relay arrangement?