Return-Path: Received: from mtain-me01.r1000.mx.aol.com (mtain-me01.r1000.mx.aol.com [172.29.96.137]) by air-ma03.mail.aol.com (v129.10) with ESMTP id MAILINMA033-b5124dd016ab21e; Sun, 15 May 2011 14:08:43 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 773F038000081; Sun, 15 May 2011 14:08:42 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QLfjW-0000YS-OO for rs_out_1@blacksheep.org; Sun, 15 May 2011 19:08:02 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QLfjW-0000YJ-0s for rsgb_lf_group@blacksheep.org; Sun, 15 May 2011 19:08:02 +0100 Received: from nm11.bullet.mail.ukl.yahoo.com ([217.146.183.185]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1QLfjU-0000vx-B2 for rsgb_lf_group@blacksheep.org; Sun, 15 May 2011 19:08:01 +0100 Received: from [217.146.183.181] by nm11.bullet.mail.ukl.yahoo.com with NNFMP; 15 May 2011 18:07:54 -0000 Received: from [217.146.183.35] by tm12.bullet.mail.ukl.yahoo.com with NNFMP; 15 May 2011 18:07:54 -0000 Received: from [127.0.0.1] by omp1024.mail.ukl.yahoo.com with NNFMP; 15 May 2011 18:07:54 -0000 X-Yahoo-Newman-Id: 679431.13866.bm@omp1024.mail.ukl.yahoo.com Received: (qmail 13857 invoked from network); 15 May 2011 18:07:54 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=KGKX5zgtLaM4DMJsa7w2gTAs4jpXcGadxmboGtXamKpL4KTzoOqB8Aq3pBlt8oISqCcWW82xZDDjWbpQ6wOpRtYhcgaPDOFDgsszBwpXGGKxmtw5W7MJwuOXU9TA5qsGg+4/o8mFojj4f7C2dPL5BNEQF1LZAQs8X7xeXu9YU8o= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1305482874; bh=kwAz6qg20USF/5zLuLUXmajCm3bPkqSJDhusGTpTG8E=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=42W7T2FV2I7YAG1SKBdZD+lYFJdkcRPaiJuZxArwXrRgFJTxfKn83L33HcpQAc6tMKNnlKhyXDhWOQPlXyvBz6hmL994jmF8iQGCp9KJO2N//+EYJY1H2AuaBeseOZtwHrO65IXk3UpDO1V8iUOBZXjLl2e9v/Cr/4zkJFvr+cg= Received: from JimPC (james.moritz@109.156.118.245 with login) by smtp818.mail.ukl.yahoo.com with SMTP; 15 May 2011 18:07:54 +0000 GMT X-Yahoo-SMTP: Cxhli3eswBD1ozmtAojhjrja86kWx0Qm9tycD5QR1DKWrOLgjJcXkw-- X-YMail-OSG: OrCr6XwVM1mYFtVrEggs8un4_kyzFW4YWaVJdk.p_sgFRZf HM9XcAydPbD7rUyKBB0HicmJYI1dPg_Lm.sh7o.Lm84lu8VbKZi6RXIFLFoO 7j_Omq4v98DXAboQFY6HZibeM1DCbVkgP4ne_ZDxgiaOEqEShfwmEvcHKFHd iVaKSPBgV7B6OHlAoeXFbomqc.ziI1tK_euuTZE7yPYUUN7mKTD33d7d1xPm RnwvaLEHvGFNPj_4oQDK6Lm5Hod6C7i2tqoKpYWyZzgecHPQepF.ByrAH4iD vuP5IUfr8TGdzrt8244M.oxg8po3IZmuxnv4VfPnAf_usoWOxpkJZaprIugx 2q9EOFXvoJ9JNtFHm6Fwjtx1R5ewDU168r0vmhf4PiHmUQLDdsY12sXzqkZw XPz0laea5fFRQBGfhe1POEkIi6kI5FT_IDzLr9yUR5Ak- X-Yahoo-Newman-Property: ymail-3 Message-ID: <02A536C3212746A5BAB4BE82E69BF68A@JimPC> From: "James Moritz" To: References: <80703.53770.qm@web28515.mail.ukl.yahoo.com> <4DCEDBB3.1020808@iup.uni-heidelberg.de> <4DCFA642.5070305@m0dts.co.uk> <4DD009E3.3060503@iup.uni-heidelberg.de> In-Reply-To: <4DD009E3.3060503@iup.uni-heidelberg.de> Date: Sun, 15 May 2011 19:08:14 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18417 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: LF SWR Bridge Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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=0.1 required=5.0 tests=MISSING_OUTLOOK_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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m011.2 ; domain : btopenworld.com DKIM : pass x-aol-sid: 3039ac1d60894dd016a92ad3 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dear Stefan, LF Group, The LF_tuning_aids.pdf file at https://sites.google.com/site/uk500khz/members-files/files I mentioned earlier contains some updated info on the LF tuning meter (extended to 500kHz), along with the simple "scopematch", which displays voltage and current waveforms on a dual-trace oscilloscope, which is a very convenient aid to tuning if you have a scope in the shack. Also included is a simple resistive SWR bridge. Although everybody is used to using SWR bridges, all they really tell you is if the antenna has a big or small mis-match - The tuning meter and scopematch give you reasonably accurate info about the actual impedance, so certainly make the job easier in my experience. Cheers, Jim Moritz 73 de M0BMU