Return-Path: Received: (qmail 82471 invoked from network); 22 Dec 2004 20:45:53 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore02.plus.net with SMTP; 22 Dec 2004 20:45:53 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1ChDiv-000EC5-4A for dave@picks.force9.co.uk; Wed, 22 Dec 2004 21:08:48 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1ChDiu-000EBn-Ky for dave@picks.force9.co.uk; Wed, 22 Dec 2004 21:08:44 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1ChDMj-000Otr-Ba for dave@picks.force9.co.uk; Wed, 22 Dec 2004 20:45:49 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ChDL0-0004kz-Se for rs_out_1@blacksheep.org; Wed, 22 Dec 2004 20:44:02 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ChDL0-0004kq-Gi for rsgb_lf_group@blacksheep.org; Wed, 22 Dec 2004 20:44:02 +0000 Received: from mk-smarthost-9.mail.uk.tiscali.com ([212.74.114.48]) by relay.thorcom.net with esmtp (Exim 4.41) id 1ChDKw-0007db-Fr for rsgb_lf_group@blacksheep.org; Wed, 22 Dec 2004 20:44:02 +0000 Received: from dsl-80-43-10-72.access.uk.tiscali.com ([80.43.10.72]:1297 helo=taylormade) by mk-smarthost-9.mail.uk.tiscali.com with smtp (Exim 4.30) id 1ChDK8-0001LR-6R; Wed, 22 Dec 2004 20:43:08 +0000 From: "Gary - G4WGT" To: "LF \(Rsgb LF Group\)" Cc: "Jim Moritz \(M0BMU\)" Date: Wed, 22 Dec 2004 20:44:09 -0000 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-SPF-Result: relay.thorcom.net: 212.74.114.48 is neither permitted nor denied by domain of tiscali.co.uk X-Spam-Score: 1.7 (+) X-Spam-Report: autolearn=no,RCVD_IN_SORBS=0.1,SARE_RECV_IP_080040=0.794,SARE_RECV_SPAM_DOMN81=0.853 Subject: LF: M0BMU mods for G0MRF 300 W Tx Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Hi Jim & LF, I am about to carry out the M0BMU current-fed mods for the G0MRF 300 watt class D Tx. I have salvaged several cores from monitor flyback/line O/P transformers & they all have an air/di-electric gap on the round leg of the core. Is this OK or should I search for one with no gap? Also reference the home-made "litz" wire, there are 2 descriptions during the course of the e-mails covering the subject ie: 3 groups of 4x 0.3 mm ecw & on the diagram 12 strands of 0.3mm ecw. Which is best/correct & how best to make it up ie: parallel or twisted strands/groups? If anyone is using the mod how well is it performing. I have increased the heat sink & airflow cooling. I have also upgraded the power supply to 40 volts - 12.5 Amps after my recent (under-rated) power supply failure. Regards & Thanks in anticipation. Gary - G4WGT Web: http://myweb.tiscali.co.uk/wgtaylor -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.296 / Virus Database: 265.6.3 - Release Date: 21/12/2004