Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 36D2838002A2E; Sun, 13 May 2012 13:10:38 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1STcIF-0000XU-Hx for rs_out_1@blacksheep.org; Sun, 13 May 2012 18:09:15 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1STcIE-0000XL-Oa for rsgb_lf_group@blacksheep.org; Sun, 13 May 2012 18:09:14 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1STcIC-0007sV-9M for rsgb_lf_group@blacksheep.org; Sun, 13 May 2012 18:09:13 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q4DH98a9012013 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 13 May 2012 19:09:08 +0200 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 q4DH98GR032229 for ; Sun, 13 May 2012 19:09:08 +0200 Message-ID: <4FAFEA71.8030700@iup.uni-heidelberg.de> Date: Sun, 13 May 2012 19:08:01 +0200 From: =?ISO-8859-15?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 X-Spam-Score: -0.7 (/) 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: Hello Group, I've just started to play a bit in EZNEC, trying to simulate a receive loop antenna for the new YV7MAE grabber. http://dl.dropbox.com/u/74746618/LF/YV7MAE_LF_Grabber.html ... still using a wire receive antenna with excellent results but now a directional antenna is needed. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 7aa9ad08848e488e22e0ff1d71f4ef1d Subject: LF: Cardioid RX antenna for LF... Content-Type: text/plain; charset=ISO-8859-15; 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=1.6 required=5.0 tests=CELL_PHONE_BOOST 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: 0:2:372720832:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60094fafeb0e6450 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello Group, I've just started to play a bit in EZNEC, trying to simulate a receive loop antenna for the new YV7MAE grabber. http://dl.dropbox.com/u/74746618/LF/YV7MAE_LF_Grabber.html ... still using a wire receive antenna with excellent results but now a directional antenna is needed. So i modelled a loop with a possible shape and a ground connection. Then i added a R on the far end of the source. The results of the elevation and 3D plot are surprising good. Maybe i have done a mistake in modelling? Optimal performance was obtained at R = 8 kOhm. This resulted in the best F/B and beamwidth... Results of ZENEC are here: http://dl.dropbox.com/u/19882028/LF/Cardioid%20for%20LF.png Any ideas, experiance or advice? I guess a preamp is needed when such a antenna is used. The typical 1:9 un-un does not look useful for me... 73, Stefan/DK7FC