Return-Path: Received: from rly-mf04.mx.aol.com (rly-mf04.mail.aol.com [172.20.29.174]) by air-mf09.mail.aol.com (v121.4) with ESMTP id MAILINMF091-95947d1de79154; Fri, 07 Mar 2008 19:32:00 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mf04.mx.aol.com (v121.4) with ESMTP id MAILRELAYINMF047-95947d1de79154; Fri, 07 Mar 2008 19:31:56 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JXmyK-0006HM-0Z for rs_out_1@blacksheep.org; Sat, 08 Mar 2008 00:31:32 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JXmyJ-0006HD-I4 for rsgb_lf_group@blacksheep.org; Sat, 08 Mar 2008 00:31:31 +0000 Received: from smtp808.mail.ird.yahoo.com ([217.146.188.68]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1JXmyF-000598-Pz for rsgb_lf_group@blacksheep.org; Sat, 08 Mar 2008 00:31:31 +0000 Received: (qmail 97318 invoked from network); 8 Mar 2008 00:31:19 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=45Thk3f5KCsVViXlpimDE4b+Q7tK8ijFPf2/cJXEmrCsiF4YgM3u0b/UHMK6R2TALcus5J+x3LjxsPx5iNj+X69wTyAFwEWtvgQoR9bNoDwLoW+dbXEYFWAxHmTXon4cSYPSJyv4+M3JgGea7hE2XvkZ/I6LyAmKCkhFyUR+uGk= ; Received: from unknown (HELO Lark) (alan.melia@btinternet.com@213.122.53.103 with login) by smtp808.mail.ird.yahoo.com with SMTP; 8 Mar 2008 00:31:18 -0000 X-YMail-OSG: wz_YSrcVM1nDtpRzwsH1WCH.0yqenJwG5wQNg21pBrywv0thBH8Xd.rtqDwhKWaA2f4s_OpPpQ-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <001301c880b3$c8f8a9a0$0900a8c0@Lark> From: "Alan Melia" To: References: <47D1A6FF.1080803@telia.com> <00d001c8809a$71f10940$0900a8c0@Lark> Date: Sat, 8 Mar 2008 00:30:13 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Karma: 0: DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: Smaller DC feeding choke in class E amplifier Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 X-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n Hi Joe , Thanks for the "plug" :-)) Yes the circulating currents get pretty large with the low impednces when you try to put high power out with 12 supply. It doesnt do some caps a lot of good either (think of the current density in the thin foil!). Most of my tests were done at 35v or higher and that is a lot easier. Best Wishes de Alan G3NYK ----- Original Message ----- From: To: Sent: Friday, March 07, 2008 11:47 PM Subject: Re: LF: Re: Smaller DC feeding choke in class E amplifier > Alan, Johan and group, > > Since experimenting on LF I have discovered the joys of Class E, > many thanks to Alan. My first 100W TX used an IRF-640 as > suggested on Alan's web page. A dozen of them could be had for about $10 > in 2003. Unfortunately, they are have gone up quite a bit since then, > although much cheaper than a 6146! There seems to be a new generation > of hexfet such as the IRFP260 and perhaps it might be possible to use this > in a 12volt 100w amp. Unfortunately, many 640's came to an untimely > demise in my unsuccessful attempts to get 100 watts with a 12 V supply. > > > 73 > Joe VO1NA >