Return-Path: Received: from mtain-mh06.r1000.mx.aol.com (mtain-mh06.r1000.mx.aol.com [172.29.96.218]) by air-mf05.mail.aol.com (v129.4) with ESMTP id MAILINMF051-8be94bf56dbe270; Thu, 20 May 2010 13:13:34 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mh06.r1000.mx.aol.com (Internet Inbound) with ESMTP id DD64C3800013C; Thu, 20 May 2010 13:13:31 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OF9IC-0005Of-Pt for rs_out_1@blacksheep.org; Thu, 20 May 2010 18:12:20 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OF9IC-0005OW-EQ for rsgb_lf_group@blacksheep.org; Thu, 20 May 2010 18:12:20 +0100 Received: from smtp-vbr18.xs4all.nl ([194.109.24.38]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OF9IA-0007Gx-Ng for rsgb_lf_group@blacksheep.org; Thu, 20 May 2010 18:12:20 +0100 Received: from pc1 (ndb.demon.nl [82.161.81.65]) by smtp-vbr18.xs4all.nl (8.13.8/8.13.8) with ESMTP id o4KHCCs5049164 for ; Thu, 20 May 2010 19:12:17 +0200 (CEST) (envelope-from roelof@ndb.demon.nl) To: rsgb_lf_group@blacksheep.org References: <008f01caf784$779a11d0$0301a8c0@your91hoehfy9g> <4BF4FBF4.2020208@iup.uni-heidelberg.de> <4BF53399.4010403@iup.uni-heidelberg.de> <4BF5387F.2040906@legal-medicine.de> <4BF53D71.8050404@iup.uni-heidelberg.de> <4BF5420D.5020604@legal-medicine.de> <4BF54BE5.4090907@iup.uni-heidelberg.de> Date: Thu, 20 May 2010 19:12:09 -0000 MIME-Version: 1.0 From: "Roelof Bakker" Message-ID: In-Reply-To: <4BF54BE5.4090907@iup.uni-heidelberg.de> User-Agent: Opera Mail/10.53 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes Subject: Re: VLF: Clipping or blanking?? 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-sid: 3039ac1d60da4bf56dbb5b40 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Stefan, This email I wrote five years ago may help you: >>>>> Hello Tom, I have used your spreadsheet from the ANSI EMI Antenna calibration spec C 63.5 1998 to verify my measurements on different whip length's, from 1 metre to 10 cm, in 10 cm increments. whip length C-whip ONO-399.5 calculated ======================================= 100 cm 8.718 pF 0 dB 0 dB 90 cm 7.978 pF -0.5 dB -0.8 dB 80 cm 7.227 pF -1.1 dB -1.6 dB 70 cm 6.646 pF -2.2 dB -2.3 dB 60 cm 5.686 pF -3.2 dB -3.7 dB 50 cm 4.890 pF -4.5 dB -5.0 dB 40 cm 4.072 pF -6.0 dB -6.6 dB 30 cm 3.224 pF -8.5 dB -8.6 dB 20 cm 2.332 pF -11.1 dB -11.5 dB 10 cm 1.364 pF -16.5 dB -16.1 dB I am very pleased to report that the results agree very well indeed. The largest deviation is only 0.6 dB. Thus before making a new whip, the performance can be accurately calculated, using a 1 metre long whip as a reference. <<<<< Best regards, Roelof Bakker, PAoRDT N.B. I can't locate the spreadsheet at present.