Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh05.r1000.mx.aol.com (Internet Inbound) with ESMTP id B917D38000096; Thu, 8 Sep 2011 17:14:59 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R1lto-00062C-E1 for rs_out_1@blacksheep.org; Thu, 08 Sep 2011 22:12:40 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R1lth-0005vM-Oy for rsgb_lf_group@blacksheep.org; Thu, 08 Sep 2011 22:12:33 +0100 Received: from sidious.london.02.net ([82.132.130.152] helo=mail.o2.co.uk) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R1lte-0001jq-V2 for rsgb_lf_group@blacksheep.org; Thu, 08 Sep 2011 22:12:31 +0100 Received: from [192.168.1.65] (46.64.39.147) by mail.o2.co.uk (8.5.119.05) (authenticated as g3ldo@o2.co.uk) id 4E68FDF90008D954 for rsgb_lf_group@blacksheep.org; Thu, 8 Sep 2011 22:16:00 +0100 Message-ID: <4E692FB6.60306@o2.co.uk> Date: Thu, 08 Sep 2011 22:12:22 +0100 From: Peter Dodd User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.22) Gecko/20110902 Thunderbird/3.1.14 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4E6554E1.1050808@gmail.com> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: LF: The Smith Chart 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: 0:2:311357248:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d41194e69305344aa X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Earlier literature such as: The Services Textbook of Radio (1958) ARRL Antenna Book 14th edition (1984) HF Antennas for all Locations 2nd edition (1993) describe a Smith Chart with the centre straight line of R j0 vertically orientated. All later and current literature containing Smith Charts show the centre straight line of R j0 horizontally orientated with maximum R to the right, but without explanation. Is there a good technical reason for this change or is it just fashion. Regards Peter, G3LDO