Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8453738000562; Mon, 5 Dec 2011 06:55:02 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RXX70-0000mM-Rq for rs_out_1@blacksheep.org; Mon, 05 Dec 2011 11:53:34 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RXX70-0000mD-BW for rsgb_lf_group@blacksheep.org; Mon, 05 Dec 2011 11:53:34 +0000 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RXX6y-0002Qx-U7 for rsgb_lf_group@blacksheep.org; Mon, 05 Dec 2011 11:53:34 +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 pB5BrVNX023280 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 5 Dec 2011 12:53:32 +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 pB5BrVg2005800 for ; Mon, 5 Dec 2011 12:53:31 +0100 Message-ID: <4EDCB05D.2080801@iup.uni-heidelberg.de> Date: Mon, 05 Dec 2011 12:51:57 +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: <4EDC0AE0.7050207@iup.uni-heidelberg.de> <4EDC0DB5.2040703@iup.uni-heidelberg.de> <4EDC1126.5070704@iup.uni-heidelberg.de> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: XGJ in TF 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: 0:2:405035200:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d61874edcb116598b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Warren, Building up a LF station is a very great job, i like to it a few hours per day. For me the vertical system is the best choice since i have EXTREMELY low earth losses available but i would also like to build up a loop, i.e. i won't do it but it would be an interesting job and challenge. Am 05.12.2011 01:48, schrieb Warren Ziegler: > > The RG-214 has a noticeably lower resistance as one might expect. I know. The screen of the RG214 is very noble. I also use that cable as the feed cable to the coil. > > I live in New England which is heavily wooded. I have experimented > with verticals but the ground loss is high due rocky soil is very high. > > If you have very lossy ground it is unlikely that you will see a > benefit with a Litz wire loading coil as the ground losses >> than the > coil loss. Yes, sure. I meant if you tried RF litz wire for the loop conductor instead of coax. I think about the weight and if you could get a lower loss resistance at the same weight when using RF litz... But it would be quite expensive for the circumference i think. > I have settled on loops as best for my location, but even then I had > to put in considerable effort to make sure that the tuner could handle > the high currents without over heating. Which currents do you get? The voltages must be in the range of some 10V i assume. How do you match to 50 Ohm? Do you have plans to improve the system even more? 73, Stefan/DK7FC