Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6C50A380000BE; Sun, 13 May 2012 13:52:19 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1STcx5-0000zs-17 for rs_out_1@blacksheep.org; Sun, 13 May 2012 18:51:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1STcx4-0000zj-K4 for rsgb_lf_group@blacksheep.org; Sun, 13 May 2012 18:51:26 +0100 Received: from out1.ip05ir2.opaltelecom.net ([62.24.128.241]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1STcx2-000843-7C for rsgb_lf_group@blacksheep.org; Sun, 13 May 2012 18:51:25 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApoPAEX0r09cF/vZ/2dsb2JhbABFii+oEAECgRyBCIIQBQEBBAEIAQEDJQEjAiYGAQEDBQIBAxEEAQEKJRQBBBoGFggGEwoBAgIBAYd4CQerYI1DixpicYEPgyYEjXqYQ4Jp X-IronPort-AV: E=Sophos;i="4.75,581,1330905600"; d="scan'208";a="380781588" Received: from host-92-23-251-217.as13285.net (HELO xphd97xgq27nyf) ([92.23.251.217]) by out1.ip05ir2.opaltelecom.net with SMTP; 13 May 2012 18:51:22 +0100 Message-ID: <004601cd3130$ffd8c540$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <4FAFEA71.8030700@iup.uni-heidelberg.de> Date: Sun, 13 May 2012 17:51:18 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 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: Stefan You are a busy man organising the Hidelburg radio club and now Venezuela radio club. I have to do everything myself, design, install and climb 100 ft masts to erect antennas. Are these installations remotely controlled by you and your team. For awards ARRL policy is that the TX/RX must be at the home QTH and not remote. de g3kev [...] 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 [62.24.128.241 listed in list.dnswl.org] 0.0 FSL_XM_419 Old OE version in X-Mailer only seen in 419 spam -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FSL_UA FSL_UA X-Scan-Signature: 64437c466041e93ffedda7fb96b22b71 Subject: LF: Re: Cardioid RX antenna for LF... Content-Type: text/plain; charset="ISO-8859-15" 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=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: 0:2:465833632:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1dc14a4faff4d21623 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Stefan You are a busy man organising the Hidelburg radio club and now Venezuela radio club. I have to do everything myself, design, install and climb 100 ft masts to erect antennas. Are these installations remotely controlled by you and your team. For awards ARRL policy is that the TX/RX must be at the home QTH and not remote. de g3kev ----- Original Message ----- From: "Stefan Schäfer" To: Sent: Sunday, May 13, 2012 5:08 PM Subject: LF: Cardioid RX antenna for LF... > 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 >