Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df04.r1000.mx.aol.com (Internet Inbound) with ESMTP id E8639380000A7; Thu, 11 Aug 2011 06:27:47 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QrSTL-0008PN-41 for rs_out_1@blacksheep.org; Thu, 11 Aug 2011 11:26:43 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QrSTK-0008PE-Or for rsgb_lf_group@blacksheep.org; Thu, 11 Aug 2011 11:26:42 +0100 Received: from smtp-vbr11.xs4all.nl ([194.109.24.31]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QrSTI-0006XO-Dg for rsgb_lf_group@blacksheep.org; Thu, 11 Aug 2011 11:26:42 +0100 Received: from pc-roelof (ndb.demon.nl [82.161.81.65]) by smtp-vbr11.xs4all.nl (8.13.8/8.13.8) with ESMTP id p7BAQYT4099859 for ; Thu, 11 Aug 2011 12:26:39 +0200 (CEST) (envelope-from roelof@ndb.demon.nl) To: rsgb_lf_group@blacksheep.org References: <4E418609.6020500@iup.uni-heidelberg.de> <67A6F7BF45BF4A0193A3DCB53000A283@PcMinto> <008401cc56ce$2f1fb2c0$0401a8c0@xphd97xgq27nyf> <12C475F3F4C84B818461753F2E8A60A6@PcMinto> <4E41AECB.90808@iup.uni-heidelberg.de> <8D68749D37B94275855FDBA46A3F6C97@PcMinto> <4E427DFB.50801@iup.uni-heidelberg.de> Date: Thu, 11 Aug 2011 12:26:27 +0200 MIME-Version: 1.0 From: "Roelof Bakker" Message-ID: In-Reply-To: User-Agent: Opera Mail/11.50 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes Subject: Re: LF: Re: HB9ASB... 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-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:407992448:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40d84e43aea30396 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello Andy, The antenna will work with an optical feedline. I can't imagine that fiber optic forms the other half of the dipole. The probe capacitance is rather low, about 3 pF. My guess is that the "counterpoise" is formed by the PCB part, carrying the buffer amplifier. The layout of the PCB art work has some effect on the received signal strength. Using leaded components, the pick up area measures 30 x 40 mm. A PCB with SMD parts will give the same output with an "antenna" measuring 24 x 30 mm. 73, Roelof, pa0rdt