Return-Path: Received: (qmail 19365 invoked from network); 10 Jul 2002 09:04:11 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 10 Jul 2002 09:04:11 -0000 Received: (qmail 17310 invoked from network); 10 Jul 2002 09:03:18 -0000 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 10 Jul 2002 09:03:18 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17SDJE-00023Q-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 10 Jul 2002 09:58:52 +0100 Received: from post.omnieng.co.uk ([193.82.59.20]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17SDFX-00020u-00 for rsgb_lf_group@blacksheep.org; Wed, 10 Jul 2002 09:55:03 +0100 Received: from mail02.ifx.com.br ([200.201.133.84] helo=mail01.ifx.com.br) by post.omnieng.co.uk with smtp (Exim 3.36 #1) id 17S4OJ-00020q-00 for rsgb_lf_group@blacksheep.org; Wed, 10 Jul 2002 00:27:32 +0100 Received: (qmail 765 invoked by uid 505); 9 Jul 2002 23:27:20 -0000 Received: from py2pll@py.qsl.br by mail01.ifx.com.br with qmail-scanner-0.96 (. Clean. Processed in 0.466485 secs); 09 Jul 2002 23:27:20 -0000 Received: from 200-201-143-218.ras01.spo.dial-up.ifxnetworks.com.br (HELO local) (200.201.143.218) by mail01.ifx.com.br with SMTP; 9 Jul 2002 23:27:20 -0000 Message-ID: <001d01c227a0$2f4fba40$50aec5c8@local> From: "PY3CRX PY2PLL" To: rsgb_lf_group@blacksheep.org References: <002601c22770$a3fd44a0$50aec5c8@local> <002701c22775$a777d320$a32565d5@oemcomputer> Subject: LF: Re: Re: LITZ wire X enameled Date: Tue, 9 Jul 2002 20:26:58 -0300 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi Johan ... > I don't know how much better Litz can do in your case but the winding > length is also important for efficiency. If I remember correctly, best efficiency > (power transfer) is achieved when the winding covers the entire length > of the ferrite rod i.e. the coil uses as much length as possible of the concentrated > field . Unfortunately, this does not coincide with maximum coil Q. Yes. Well remembered. My first try with the 20cm rod has more or less the same turns amount but covering half of the rod lenght. Then I read somewhere about covering all rod lenght to improve efficiency so I changed from a thinner wire to this 0.5mm diameter one. Really improved. Right after I wrote the messages asking about litz wire, instead of remove some turns to change the freq covereage I spreaded the existing coil. The freq covereage changed and the signals increased, I can say something between 5 and 10dB. IŽll check later using the same SLM I used to generate a 6 frequency table with uV readings ... Thanks on the comments. 73 Marcus, PY3CRX/PY2PLL GG66rf http://py.qsl.br Active from "DC" to 24GHz