X-GM-THRID: 1205925275142971774 X-Gmail-Labels: rsgb lf X-Gmail-Received: 8c333f268ac277e664b959ae6846cc0dc6c20de7 Delivered-To: daveyxm@gmail.com Received: by 10.54.127.17 with SMTP id z17cs16664wrc; Sun, 11 Jun 2006 16:30:00 -0700 (PDT) Received: by 10.48.225.16 with SMTP id x16mr1363076nfg; Sun, 11 Jun 2006 16:30:00 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id z73si5653697nfb.2006.06.11.16.29.59; Sun, 11 Jun 2006 16:30:00 -0700 (PDT) Received-SPF: neutral (gmail.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 1FpZJr-0003zI-Eb for rs_out_1@blacksheep.org; Mon, 12 Jun 2006 00:26:11 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FpZJq-0003z9-Vw for rsgb_lf_group@blacksheep.org; Mon, 12 Jun 2006 00:26:10 +0100 Received: from imo-m20.mx.aol.com ([64.12.137.1]) by relay1.thorcom.net with esmtp (Exim 4.62) (envelope-from ) id 1FpZJn-0001nJ-6S for rsgb_lf_group@blacksheep.org; Mon, 12 Jun 2006 00:26:10 +0100 Received: from G0MRF@aol.com by imo-m20.mx.aol.com (mail_out_v38_r7.5.) id l.432.350ad82 (32913) for ; Sun, 11 Jun 2006 19:22:13 -0400 (EDT) From: G0MRF@aol.com Message-ID: <432.350ad82.31bdffa4@aol.com> Date: Sun, 11 Jun 2006 19:22:12 EDT To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 SE for Windows sub 5014 X-Spam-Flag: NO X-Spam-Score: -0.4 (/) X-Spam-Report: autolearn=disabled,AWL=-1.065,DNS_FROM_RFC_ABUSE=0.374,HTML_50_60=0.095,HTML_MESSAGE=0.001,NO_REAL_NAME=0.178 Subject: Re: LF: Re:PA4VHF/p TX problems Content-Type: multipart/alternative; boundary="-----------------------------1150068132" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.1 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MAILTO_TO_SPAM_ADDR,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: 5176 -------------------------------1150068132 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 11/06/2006 21:03:30 GMT Standard Time, knaap159@zonnet.nl writes: So, perhaps I should trow out this core and use an air wound coil to transform 50 to 100-300 Ohm. Any suggestions about size/turns etc, or the use of other core material? 73 Dick, PA4VHF Hello Dick. I wonder if you can just get rid of the transformer? I used a similar system using fishing rods on a trip to France a while ago. The bandwidth was very narrow but I found that a coil tapped near ground for 50 ohms with a variometer and coil on top worked fairly well. Ultimately to get higher current you may need a little more height than 8m. (Wire supported by a tree perhaps?) 73 David MRF -------------------------------1150068132 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 11/06/2006 21:03:30 GMT Standard Time,=20 knaap159@zonnet.nl writes:

So,=20 perhaps I should trow out this core and use an air wound coil to
transf= orm=20 50 to 100-300 Ohm.
Any suggestions about size/turns etc, or the use of=20 other core material?

73

Dick, PA4VHF

Hello Dick.

I wonder if you can just get rid of the transformer?

I used a similar system using fishing rods on a trip to France a while=20= ago.=20 The bandwidth was very narrow but I found that a coil tapped near ground for= 50=20 ohms with a variometer and coil on top worked fairly well. Ultimately=20= to=20 get higher current you may need a little more height than 8m. (Wire supporte= d by=20 a tree perhaps?)

David MRF

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