Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mb06.r1000.mx.aol.com (Internet Inbound) with ESMTP id B5C0B380000A6; Sat, 30 Jun 2012 08:44:12 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Skx19-0006Ol-J8 for rs_out_1@blacksheep.org; Sat, 30 Jun 2012 13:43:15 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Skx18-0006Oc-T0 for rsgb_lf_group@blacksheep.org; Sat, 30 Jun 2012 13:43:14 +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 1Skx17-0005kk-CJ for rsgb_lf_group@blacksheep.org; Sat, 30 Jun 2012 13:43:13 +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 q5UChC1s011081 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sat, 30 Jun 2012 14:43:12 +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 q5UChCx0018755 for ; Sat, 30 Jun 2012 14:43:12 +0200 Message-ID: <4FEEF3ED.4070503@iup.uni-heidelberg.de> Date: Sat, 30 Jun 2012 14:41:17 +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-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id q5UChC1s011081 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: MF, Another thing. Right now it is 32 °C here. Best place it to stay on the beach or on the top of a hill in the forest. Today i choose the forest. Accidentally there is my 700m (ish) long earth antenna which has an average height above ground of 8m. Today i want to use it as a dipole for the 630m band. The feed point is somewhere in the middle but not exactly known. [...] 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: f62c7cf8eeb8e5a327b71719e9bffff1 Subject: LF: An asymmetric feeded full wave dipole for the 630m band Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: quoted-printable 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: 0:2:349514656:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d601a4feef49c1600 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none MF, Another thing. Right now it is 32 =B0C here. Best place it to stay on the= =20 beach or on the top of a hill in the forest. Today i choose the forest. Accidentally there is my 700m (ish) long earth antenna which has an=20 average height above ground of 8m. Today i want to use it as a dipole=20 for the 630m band. The feed point is somewhere in the middle but not=20 exactly known. What will the efficiency and radiation pattern be? Is it a dipole or=20 what? EZNEC says it will have 10 Ohm Z=3DR at resonance (Cu losses +=20 "typical" ground losses). The WX forcast says there will be much QRN in the evening, anyway. Maybe someone can listen from time to time on 476.5 kHz? I will listen=20 on the band (+ 500 kHz +-) too and maybe a QSO is possible. Who knows... If the antenna behaves as a dipole it should radiate E/W, so good=20 chances for UK, PA and DF6NM, DJ2LF... I'll start now and may be "QRV" in 2 hours or so. Here, the first time my PA will operate in /p. Nice that it is smaller=20 than a VHS video cassette and allows to generate QRP at high efficiency! 73, CU, Stefan/DK7FC