Return-Path: Received: (qmail 36428 invoked from network); 16 Jan 2005 23:14:19 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 16 Jan 2005 23:14:19 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CqJXO-000AAC-H8 for dave@picks.force9.co.uk; Sun, 16 Jan 2005 23:10:26 +0000 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CqJXO-000AA9-EO for dave@picks.force9.co.uk; Sun, 16 Jan 2005 23:10:26 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1CqJb9-000Fci-6E for dave@picks.force9.co.uk; Sun, 16 Jan 2005 23:14:19 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CqJas-0006pd-0J for rs_out_1@blacksheep.org; Sun, 16 Jan 2005 23:14:02 +0000 Received: from [193.82.59.20] (helo=relay.omnieng.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CqJar-0006pU-GS for rsgb_lf_group@blacksheep.org; Sun, 16 Jan 2005 23:14:01 +0000 Received: from anchor-post-34.mail.demon.net ([194.217.242.92]) by relay.omnieng.net with esmtp (Exim 4.41) id 1CqJad-0006y0-OJ for rsgb_lf_group@blacksheep.org; Sun, 16 Jan 2005 23:13:51 +0000 Received: from pickmere.demon.co.uk ([158.152.117.143]) by anchor-post-34.mail.demon.net with esmtp (Exim 4.42) id 1CqJac-0006S5-Dj for rsgb_lf_group@blacksheep.org; Sun, 16 Jan 2005 23:13:46 +0000 Message-ID: Date: Sun, 16 Jan 2005 21:22:00 +0000 To: rsgb_lf_group@blacksheep.org From: "M. J. Powell" References: <41EA3B2E.152.BF48D9@localhost> <000401c4fb13$98ef8180$f8ce28c3@erica> In-Reply-To: <000401c4fb13$98ef8180$f8ce28c3@erica> MIME-Version: 1.0 User-Agent: Turnpike/6.01-S () X-SPF-Result: relay.omnieng.net: 194.217.242.92 is neither permitted nor denied by domain of pickmere.demon.co.uk X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=no, Subject: Re: LF: SWR-off topic Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit In message <000401c4fb13$98ef8180$f8ce28c3@erica>, g3ldo writes >I am currently updating some of the antenna material in the RSGB Radio >Communications Handbook. >I have a question about SWR meters. >In my early days of amateur radio I didn't have an SWR meter. I obtained >some idea of antenna/feeder mismatch by using a multiple of half wavelength >of coax and measuring the antenna feed Z using the Pi output capacitor >(suitably calibrated) of the transmitter. >At about the same time I was a RADAR technition in the RAF. When a magnetron >was replaced on 3cm equipment (H2S) Wasn't H2S 10cm equipment? Mike J.Powell