Return-Path: Received: (qmail 2828 invoked from network); 12 Apr 2000 19:28:15 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by redlabel.core.plus.net.uk with SMTP; 12 Apr 2000 19:28:15 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12fSYZ-0001jM-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 12 Apr 2000 20:12:07 +0100 Received: from mashie.force9.net ([195.166.128.30]) by post.thorcom.com with smtp (Exim 3.02 #1) id 12fSYW-0001jC-00 for rsgb_lf_group@blacksheep.org; Wed, 12 Apr 2000 20:12:04 +0100 Received: (qmail 13461 invoked from network); 12 Apr 2000 19:13:55 -0000 Received: from rack.servers.plus.net.uk (212.159.2.65) by mashie.force9.net with SMTP; 12 Apr 2000 19:13:55 -0000 Received: (qmail 28784 invoked from network); 12 Apr 2000 19:12:33 -0000 Received: from unknown (HELO main) (212.159.76.14) by rack.servers.plus.net.uk with SMTP; 12 Apr 2000 19:12:33 -0000 Message-ID: <009b01bfa4b3$a72b5780$0600a8c0@main> From: "Dave" To: rsgb_lf_group@blacksheep.org References: <3617AC3245C2D1118A840000F805359C01752857@PDW-MERCURY-1> Subject: LF: Re: Coil winding conundrum Date: Wed, 12 Apr 2000 20:13:45 +0100 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 5.00.2014.211 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: Andy I found the same thing on topband and was puzzled so I did some tests. Only below 500kHz did the particular grade of (quite thick) litz wire exhibit an improvement. As for why... I don't know, but the Fine Wire Company, which makes the stuff has tables of spec for Litz and you have to use the right grade for the frequency in use, presumably to match the skin effect to the strand diameter. Interesting stuff. Dave G3YXM.