X-GM-THRID: 1203115809032070620 X-Gmail-Labels: lowfer,rsgb lf X-Gmail-Received: 8af29742a58ac45e7b843a6d80989236de674c81 Delivered-To: daveyxm@gmail.com Received: by 10.54.72.15 with SMTP id u15cs9967wra; Thu, 11 May 2006 13:50:47 -0700 (PDT) Received: by 10.49.85.10 with SMTP id n10mr806153nfl; Thu, 11 May 2006 13:50:46 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id n22si1298856nfc.2006.05.11.13.50.45; Thu, 11 May 2006 13:50:46 -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 1FeI3W-00089g-9k for rs_out_1@blacksheep.org; Thu, 11 May 2006 21:46:42 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FeI3V-00089X-N6 for rsgb_lf_group@blacksheep.org; Thu, 11 May 2006 21:46:41 +0100 Received: from mail.hurontel.on.ca ([216.46.129.11]) by relay1.thorcom.net with esmtp (Exim 4.51) id 1FeJyJ-0001ho-E5 for rsgb_lf_group@blacksheep.org; Thu, 11 May 2006 23:49:42 +0100 Received: from server (dial-156.hurontel.on.ca [216.46.128.156]) by mail.hurontel.on.ca (Postfix) with SMTP id F000217E95; Thu, 11 May 2006 16:46:13 -0400 (EDT) Message-ID: <000a01c67534$173471e0$0b01a8c0@server> From: "J. B. Weazle McCreath" To: Cc: Date: Thu, 11 May 2006 20:49:02 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: -0.9 (/) X-Spam-Report: autolearn=disabled,AWL=-0.953,HTML_50_60=0.095,HTML_MESSAGE=0.001 Subject: LF: Transformer idea Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C6753C.55B74700" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE 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: 6960 This is a multi-part message in MIME format. ------=_NextPart_000_0007_01C6753C.55B74700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Guys, I came up with an idea for a universal matching transformer based on = information that I got from XKO's and GW4ALG's websites, and before I build it I = thought I'd ask for your opinions and suggestions. It's for use with a Marconi = antenna. The core is a square toroid from a TV horizontal output transformer, = measuring about 3 inches on a side and a cross section of about 1/2 inch or so. = All of the original windings have been removed and the two C pieces are tightly = clamped together. My design would have a primary wound on one side of the square = consisting of 10 turns in total, with a tap at 9 turns. The first secondary would be = a single winding of 8 turns wound directly over the primary. The second = secondary is different in that it would be 2 quadrafilar turns wound directly over = the first two windings and connected such that there would be taps at 2, 4, 6, and 8 = turns. The two secondary windings would be connected in series aiding, so that = the available taps would be 8, 10, 12, 14, and 16 turns. Depending on tap selection, there would be 10 different turns ratios = available that would, with a 50 ohm input to the primary, give a range of output Z = from 32 to 150 ohms. Are there any flaws with this idea and should I go ahead and build it? 73, J.B., VE3EAR - VE3WZL Solar and wind powered EN93dr ------=_NextPart_000_0007_01C6753C.55B74700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Guys,
 
I came up with an idea for a universal = matching=20 transformer based on information
that I got from XKO's and GW4ALG's = websites, and=20 before I build it I thought I'd
ask for your opinions and = suggestions.  It's=20 for use with a Marconi antenna.
 
The core is a square toroid from a TV = horizontal=20 output transformer, measuring
about 3 inches on a side and a cross = section of=20 about 1/2 inch or so.  All of the
original windings have been removed and = the two C=20 pieces are tightly clamped
together.
 
My design would have a primary wound on = one side of=20 the square consisting of
10 turns in total, with a tap at 9 = turns.  The first secondary would be a single
winding of 8 turns wound directly over = the=20 primary.  The second secondary is
different in that it would be 2 = quadrafilar turns=20 wound directly over the first two
windings and connected such that there = would be=20 taps at 2, 4, 6, and 8 turns.
The two secondary windings would be = connected in=20 series aiding, so that the
available taps would be 8, 10, 12, 14, = and 16=20 turns.
 
Depending on tap selection, there would = be 10=20 different turns ratios available
that would, with a 50 ohm input to the = primary,=20 give a range of output Z from
32 to 150 ohms.
 
Are there any flaws with this idea and = should I go=20 ahead and build it?
 
73, J.B., VE3EAR - VE3WZL
Solar and = wind=20 powered
EN93dr
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