X-GM-THRID: 1239815914256979057 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.78.172.10 with SMTP id u10cs454275hue; Thu, 21 Jun 2007 06:40:56 -0700 (PDT) Received: by 10.78.172.20 with SMTP id u20mr951033hue.1182433256841; Thu, 21 Jun 2007 06:40:56 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id f7si9189256nfh.2007.06.21.06.40.52; Thu, 21 Jun 2007 06:40:56 -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) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1I1Mpg-0007s6-RX for rs_out_1@blacksheep.org; Thu, 21 Jun 2007 14:36:20 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1I1Mpg-0007rx-Ev for rsgb_lf_group@blacksheep.org; Thu, 21 Jun 2007 14:36:20 +0100 Received: from rwcrmhc14.comcast.net ([216.148.227.154]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1I1Mpe-0002Mn-PJ for rsgb_lf_group@blacksheep.org; Thu, 21 Jun 2007 14:36:20 +0100 Received: from rmailcenter79.comcast.net ([204.127.197.179]) by comcast.net (rwcrmhc14) with SMTP id <20070621133607m14006f6qke>; Thu, 21 Jun 2007 13:36:12 +0000 Received: from [24.91.125.179] by rmailcenter79.comcast.net; Thu, 21 Jun 2007 13:36:06 +0000 From: k2ors@comcast.net To: rsgb_lf_group@blacksheep.org, Date: Thu, 21 Jun 2007 13:36:06 +0000 Message-Id: <062120071336.18827.467A7EC5000EF6D70000498B22007610640B97010D0A020E06979D0E03@comcast.net> X-Mailer: AT&T Message Center Version 1 (Oct 4 2006) X-Authenticated-Sender: bWFyeWphbmVib3lkQGNvbWNhc3QubmV0 X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55 Subject: Re: LF: Re: LF Vertical Antennas problem... X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_NAME 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: 1196 Hi Jim, Thanks for the suggestions, when I get a chance I'm going to lower the dipole and check for oxidized connections, 'dry' joints etc. The antenna has been up for a few years and could probably benefit from fresh connections. -- 73 Warren K2ORS/WD2XGJ/WD2XSH/23/WE2XEB/2 FN42hi http://www.w4dex.com/wd2xgj.htm -------------- Original message ---------------------- From: "James Moritz" > 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 > > > > > >