Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5E7D13800009A; Tue, 20 Dec 2011 07:27:28 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RcymP-00054q-Fj for rs_out_1@blacksheep.org; Tue, 20 Dec 2011 12:26:49 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RcymP-00054h-3j for rsgb_lf_group@blacksheep.org; Tue, 20 Dec 2011 12:26:49 +0000 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RcymO-0001yw-N7 for rsgb_lf_group@blacksheep.org; Tue, 20 Dec 2011 12:26:49 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id pBKCQldZ030467 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 20 Dec 2011 13:26:47 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id pBKCQl5B010884 for ; Tue, 20 Dec 2011 13:26:47 +0100 Message-ID: <4EF07E9B.2070401@iup.uni-heidelberg.de> Date: Tue, 20 Dec 2011 13:24:59 +0100 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <033201ccbcab$5c5fe640$1502a8c0@Clemens04> <000901ccbcc4$42768fe0$c763afa0$@com> <4EECC1E8.4000806@iup.uni-heidelberg.de> <002c01ccbd6f$572761c0$0401a8c0@xphd97xgq27nyf> <39D91133A64A480596FBAA4395D85812@JimPC> <007901ccbd9e$69fe2ed0$0401a8c0@xphd97xgq27nyf> <08C805D2A1C04E64836275C632577CF2@JimPC> <000901ccbe3e$31cd2700$0401a8c0@xphd97xgq27nyf> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Re: Re: Re: TX system at DK7FC, schematic 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:428460224:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d608c4ef07f303226 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Am 20.12.2011 00:49, schrieb James Moritz: > [...] > With a high loaded-Q antenna, small changes in reactance result in a > large mismatch, and the continuously-variable variometer inductance > allows precise adjustment of matching. If you used some arrangement of > tapped coils instead, the inevitable slight errors in inductance > caused by only being able to adjust in discrete steps would probably > result in a greater reduction in antenna current than that caused by > variometer losses. > [...] > Exactly. That's what happend tonite and in the morning. The first time in the season it is snowing here and so my system got strongly out of resonance, reducing the TX power by about 10 dB. So i hardly expect TA reports from this night. A pity, since we are in the best time of this season... I really need the automatic variometer now. The phase meter (M0BMU design) already works very well. Hope to get it ready during this week. A work that makes fun! 73 all, Stefan/DK7FC