Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb05.r1000.mx.aol.com (Internet Inbound) with ESMTP id BF2F438000082; Sun, 23 Sep 2012 05:48:34 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TFimp-0000YD-Lj for rs_out_1@blacksheep.org; Sun, 23 Sep 2012 10:47:39 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TFimp-0000Y4-7q for rsgb_lf_group@blacksheep.org; Sun, 23 Sep 2012 10:47:39 +0100 Received: from mailout-de.gmx.net ([213.165.64.23]) by relay1.thorcom.net with smtp (Exim 4.77) (envelope-from ) id 1TFimn-0002s3-H4 for rsgb_lf_group@blacksheep.org; Sun, 23 Sep 2012 10:47:38 +0100 Received: (qmail 21868 invoked by uid 0); 23 Sep 2012 09:47:34 -0000 Received: from 85.178.80.203 by www044.gmx.net with HTTP; Sun, 23 Sep 2012 11:47:31 +0200 (CEST) Date: Sun, 23 Sep 2012 11:47:31 +0200 From: "Dennis" In-Reply-To: <7A3854435BE8444D9F88BF5386CEEB16@White> Message-ID: <20120923094731.40010@gmx.net> MIME-Version: 1.0 References: <2B7C70762BC94CAE9E6DC1D5456D0839@acerf441e6fc4f> <7A3854435BE8444D9F88BF5386CEEB16@White> To: rsgb_lf_group@blacksheep.org X-Authenticated: #4122078 X-Flags: 0001 X-Mailer: WWW-Mail 6100 (Global Message Exchange) X-Priority: 3 X-Provags-ID: V01U2FsdGVkX18XZHYHbjwXbE+RLZdZrzfeXA7X3y3NXr/Kw8KmxG OHKMyQoH5nuaCEBYSthju0q4JhZMnHCDVVUg== X-GMX-UID: 5L8scMVueSEqVL+GVXQhwiF+IGRvb8BD X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Many thanks Markus for this neat explanation, and many thanks Edgar for asking that question! :) Especially that somehow twisted loops will not loose their nulls is a good message to me. ;) Greetings! Dennis, Berlin, DL6NVC [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [213.165.64.23 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dennis.hennig[at]gmx.de) -0.0 SPF_PASS SPF: sender matches SPF record X-Scan-Signature: c9d6a1e47761f7ec7375ac340bef30d0 Content-Type: text/plain; charset="utf-8" Subject: Thanks! / was: Re: LF: loop - low angle signal reception Content-Transfer-Encoding: 8bit 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-sid: 3039ac1d6019505edaf251f1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Many thanks Markus for this neat explanation, and many thanks Edgar for asking that question! :) Especially that somehow twisted loops will not loose their nulls is a good message to me. ;) Greetings! Dennis, Berlin, DL6NVC -------- Original-Nachricht -------- > Datum: Sun, 23 Sep 2012 11:01:45 +0200 > Von: "Markus Vester" > An: rsgb_lf_group@blacksheep.org > CC: rsgb_lf_group@yahoogroups.co.uk > Betreff: Re: LF: loop - low angle signal reception > Hi Edgar, > > good question. I think on LF, where the size of the antenna is much > smaller than a wavelength, the shape of the loop does not affect the radiation > pattern at all. This is even true if it were distorted in three dimensions, > there is always an effective axis which defines the direction of the two > opposite nulls. Also the height above ground (or below it in the case of an > earth antenna) makes little difference. > > Induced voltage is proportional to area, so the 2x2 should produce > slightly more signal than the 1x3. On the other hand, depending on local > environment, B may be better than A in terms of ground losses and local QRM pickup. > > > Best wishes, > Markus > > > From: Edgar J Twining > Sent: Sunday, September 23, 2012 5:32 AM > To: rsgb_lf_group@blacksheep.org > Subject: LF: loop - low angle signal reception > > > Hi, > The rectangles in the image are ment to represent loop receiving > antennas. > > The numbers represent the length of the sides. ie there have the same > perimeter. > > > Does making the rectangle taller provide better low angle signal > reception? > > Regards Edgar > Moonah, Tasmania.