X-GM-THRID: 1239815914256979057 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.78.172.10 with SMTP id u10cs453996hue; Thu, 21 Jun 2007 06:33:57 -0700 (PDT) Received: by 10.82.151.14 with SMTP id y14mr3912925bud.1182432837312; Thu, 21 Jun 2007 06:33:57 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id k5si352959nfd.2007.06.21.06.33.49; Thu, 21 Jun 2007 06:33:57 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) DomainKey-Status: bad (test mode) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1I1Mgt-0007k7-2L for rs_out_1@blacksheep.org; Thu, 21 Jun 2007 14:27:15 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1I1Mgr-0007jy-HD for rsgb_lf_group@blacksheep.org; Thu, 21 Jun 2007 14:27:13 +0100 Received: from smtp801.mail.ird.yahoo.com ([217.146.188.61]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1I1Mgq-0002GW-K5 for rsgb_lf_group@blacksheep.org; Thu, 21 Jun 2007 14:27:13 +0100 Received: (qmail 76382 invoked from network); 21 Jun 2007 13:27:07 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=Received:X-YMail-OSG:Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=aRT0aAMm0nZPlDsvqATJJ3I2dxEcs4m26fdD0pYkv/dbcd6ISR/fu/5oHOIigP/TMj3sV5LPMOEUFZ9l+fKU/miwz11OUCaDkOi/vc4F7pVyng1SF4ZmtdLVGFC4CyxKv7fSJ5oQm0aw5GRm6YSV4orVaAo6fQL/emscYJ8Z0w4= ; Received: from unknown (HELO w4o8m9) (james.moritz@btopenworld.com@81.131.6.32 with login) by smtp801.mail.ird.yahoo.com with SMTP; 21 Jun 2007 13:27:06 -0000 X-YMail-OSG: 1vwFRJIVM1lX9.2Ey4jcT0EB0TzfdrdDJovPFnHRI_zriD0Alj2jQ1uQ4PmW1RtuOurDCWPnqlk1JTUIhhnCVBhjHiMekuSdGjsf0T1Dx6VhB3yQ Received: from 127.0.0.1 (AVG SMTP 7.5.472 [269.9.1/857]); Thu, 21 Jun 2007 14:27:01 +0100 Message-ID: <001601c7b407$d9d600c0$20068351@w4o8m9> From: "James Moritz" To: References: <062020072228.467.4679A9F000059E24000001D322058891160B97010D0A020E06979D0E03@comcast.net> Date: Thu, 21 Jun 2007 14:27:01 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: LF Vertical Antennas problem... Content-Type: text/plain; charset="iso-8859-1" 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 Status: O X-Status: X-Keywords: X-UID: 1197 Dear Warren, LF Group, Assuming you are using the same loading coil as before, another possibility is that the loss resistance of the antenna has increased a lot - with a tapped loading coil there is a definite upper limit to the resistance which can be matched, which depends on the coil geometry. But it would probably still need something drastic to happen to the antenna to produce a large increase in Rloss, e.g. bad connection, etc. Cheers, Jim Moritz 73 de M0BMU ----- Original Message ----- From: To: "rsgb lf reflector" ; "rsgb lf reflector" Sent: Wednesday, June 20, 2007 11:28 PM Subject: LF: LF Vertical Antennas problem... > Hello the list, > Now I find that I cannot resonate the antenna - I can't eliminate the reactance no matter what the setting of the tap or the coil. The best I can do is an swr of 1.7:1 and at least 40 ohms of reactance. I have tried changing coils and still the problem persists. If I do transmit this way, my signal seems to be down at least 10dB below what it was when the antenna resonated properly. Any thoughts? > > > -- > 73 Warren K2ORS/WD2XGJ/WD2XSH/23/WE2XEB/2 > FN42hi > http://www.w4dex.com/wd2xgj.htm > >