Delivered-To: daveyxm@virginmedia.com Received: by 10.50.57.9 with SMTP id e9csp135625igq; Sun, 7 Jul 2013 04:08:55 -0700 (PDT) X-Received: by 10.14.7.133 with SMTP id 5mr20295576eep.115.1373195334520; Sun, 07 Jul 2013 04:08:54 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com. [195.171.43.25]) by mx.google.com with ESMTP id a42si12651163eeb.101.2013.07.07.04.08.54 for ; Sun, 07 Jul 2013 04:08:54 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UvmS0-0008WL-9z for rs_out_1@blacksheep.org; Sun, 07 Jul 2013 11:44:16 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UvmRz-0008WC-OY for rsgb_lf_group@blacksheep.org; Sun, 07 Jul 2013 11:44:15 +0100 Received: from mx4.utsp.utwente.nl ([130.89.2.32] helo=mxpool.utwente.nl) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1UvmRy-0001eP-7s for rsgb_lf_group@blacksheep.org; Sun, 07 Jul 2013 11:44:14 +0100 Received: from ewi1614.ewi.utwente.nl (utwks06146.ad.utwente.nl [130.89.13.213]) by mxpool.utwente.nl (8.13.8) with ESMTP id r67AiDd7019306 for ; Sun, 7 Jul 2013 12:44:13 +0200 Received: by ewi1614.ewi.utwente.nl (Postfix, from userid 17643373) id 520F83C408B7; Sun, 7 Jul 2013 12:44:13 +0200 (CEST) Date: Sun, 7 Jul 2013 12:44:13 +0200 From: Pieter-Tjerk de Boer To: rsgb_lf_group@blacksheep.org Message-ID: <20130707104413.GD22595@cs.utwente.nl> Mail-Followup-To: rsgb_lf_group@blacksheep.org References: <51D498BD.3050007@iup.uni-heidelberg.de> <005b01ce798a$b0476600$6d01a8c0@DELL4> <20130706131640.GG5246@cs.utwente.nl> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) X-Spam-Score: -0.3 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: On Sat, Jul 06, 2013 at 08:32:13PM +0200, Roelof Bakker wrote: > One test I still intend to do is to feed the antenna with a 9V > battery and use fiber optic to transport the rf to the shack. I am > using a non conductive fiber glass pole and my guess is that the > antenna still will work. [...] Content analysis details: (-0.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.3 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 4ead635eadbaebfaa92cfec77deb715d Subject: Re: LF: VK1OD's analysis of the MiniWhip antenna Content-Type: text/plain; charset=us-ascii 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: 3130 On Sat, Jul 06, 2013 at 08:32:13PM +0200, Roelof Bakker wrote: > One test I still intend to do is to feed the antenna with a 9V > battery and use fiber optic to transport the rf to the shack. I am > using a non conductive fiber glass pole and my guess is that the > antenna still will work. I'm pretty sure it won't work. The reason is that then the entire amplifier circuit, with everything which is electrically connected to it, is at essentially one place up the pole. All parts of that circuit are capacitively coupled to the electric field at that place, so they are all at the same potential, so the circuit doesn't see any potential _difference_ that it can amplify and send down the fiber optic cable. 73, Pieter-Tjerk, PA3FWM