Return-Path: Received: from mtain-de05.r1000.mx.aol.com (mtain-de05.r1000.mx.aol.com [172.29.64.205]) by air-de04.mail.aol.com (v129.10) with ESMTP id MAILINDE042-5eaf4ddc466b276; Tue, 24 May 2011 19:59:39 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-de05.r1000.mx.aol.com (Internet Inbound) with ESMTP id A37B2380000CD; Tue, 24 May 2011 19:59:34 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QP1Uk-000547-Lg for rs_out_1@blacksheep.org; Wed, 25 May 2011 00:58:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QP1Uk-00053y-4m for rsgb_lf_group@blacksheep.org; Wed, 25 May 2011 00:58:38 +0100 Received: from mailout11.t-online.de ([194.25.134.85]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QP1Uh-0008MT-WC for rsgb_lf_group@blacksheep.org; Wed, 25 May 2011 00:58:38 +0100 Received: from fwd00.aul.t-online.de (fwd00.aul.t-online.de ) by mailout11.t-online.de with smtp id 1QP1Ug-0002Nb-Dl; Wed, 25 May 2011 01:58:34 +0200 Received: from [192.168.2.32] (E4gbgvZU8hVTOyGzMM-kZYThcgoPVQku+gCqG5oefQiq1mUYJgt5S9PaYnEgdePgzA@[91.57.70.234]) by fwd00.t-online.de with esmtp id 1QP1Ue-15FYa80; Wed, 25 May 2011 01:58:32 +0200 MIME-Version: 1.0 From: hajo.brandt.dj1zb@t-online.de References:<4DDC2383.1080000@iup.uni-heidelberg.de> <000801cc1a5f$50760970$8cd9160a@EFREMOV> In-Reply-To:<000801cc1a5f$50760970$8cd9160a@EFREMOV> To: X-Mailer: T-Online eMail 6.08.0003 Date: 24 May 2011 23:58 GMT Message-ID: <1QP1Ue-15FYa80@fwd00.t-online.de> X-ID: E4gbgvZU8hVTOyGzMM-kZYThcgoPVQku+gCqG5oefQiq1mUYJgt5S9PaYnEgdePgzA X-TOI-MSGID: 88c3ec05-6bdf-4840-bbce-c7254ff87996 X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: Re: RN3AGC on aerial ground Content-Type: Text/Plain; Charset="ISO-8859-1" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_NAME 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: 3039ac1d40cd4ddc46666879 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Content-Transfer-Encoding: quoted-printable Dear all, the different efficiency of a typical radio amateur LF aerial between winter and summer is due to the frozen ground in winter, causing lower ground loss. Therefore I have employed a matching transformer between feeder cable and the aerial feed point using three taps on the secondary. =20 This has already been confirmed earlier by Swiss LF operators in the "good old CW period" around 1998-2000. But I also remember that british LF operators had problems to confirm this, possibly because of less and weaker freeze periods in wintertime in their country. This transformer has also the task to separate the safety ground in the shack and the outside aerial ground, otherwise I have noticed that plugging and unplugging equipment in the shack may change aerial tuning. HW? 73 Ha-Jo, DJ1ZB=20 "rn3agc" schrieb: > Hi Stefan, > The aerial doesn't work in the summer... > In the winter on PA 24V 12A, now only 7A with 32V. >=20 > Frequency of a synthesizer "jumps", this is something new.. >=20 > 73 > Andrey >=20 >=20 > > ...is currently transmitting DFCW-60 at 137.7775 kHz, visible in YO = =20 > > http://qsl.net/4x1rf/yo/lfgrabber.htm > >=20 > > Maybe the signal comes up here in west EU later... > >=20 > > 73, Stefan/DK7FC > > >=20 >=20