Return-Path: Received: (qmail 32745 invoked from network); 26 May 2004 20:25:44 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore03.plus.net with SMTP; 26 May 2004 20:25:44 -0000 Received: (qmail 10948 invoked from network); 26 May 2004 20:25:44 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 26 May 2004 20:25:42 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1BT4y6-0002TI-DP for dave@picks.force9.co.uk; Wed, 26 May 2004 20:25:42 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1BT4x4-0005TM-Db for rs_out_1@blacksheep.org; Wed, 26 May 2004 21:24:38 +0100 Received: from [213.232.95.59] (helo=relay.salmark.net) by post.thorcom.com with esmtp (Exim 4.14) id 1BT4x3-0005TB-Uh for rsgb_lf_group@blacksheep.org; Wed, 26 May 2004 21:24:38 +0100 Received: from postbode03.zonnet.nl ([62.58.50.90]) by relay.salmark.net with esmtp (Exim 4.24) id 1BTBVY-0004jL-51 for rsgb_lf_group@blacksheep.org; Thu, 27 May 2004 04:24:40 +0100 Received: (qmail 18474 invoked by uid 10); 26 May 2004 20:24:22 -0000 Received: (vexira-qq 18010-9C369DBE invoked from network) 26 May 2004 22:24:17 +0200 X-Fake-Domain: unknown Received: from unknown (HELO ibm) ([62.59.190.230]) (envelope-sender ) by postbode03.zonnet.nl (qmail-ldap-1.03) with SMTP for < >; 26 May 2004 20:24:17 -0000 X-Bad-Message-ID: no DNS (ibm) Message-ID: <000501c4435d$fd8221c0$2102000a@ibm> From: "Dick" To: rsgb_lf_group@blacksheep.org Date: Wed, 26 May 2004 22:13:05 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-AntiVirus: checked by Vexira MailArmor (version: 2.0.1.16; VAE: 6.25.0.59; VDF: 6.25.0.77; host: postbode02.zonnet.nl) X-Spam-Score: 2.3 (++) X-Spam-Report: autolearn=no,FROM_ENDS_IN_NUMS=0.869,PLING_PLING=1.325,RCVD_IN_SORBS=0.1 Subject: LF: good news: it finally works!!!!! 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-Level: ** X-Spam-Status: No, hits=2.2 required=5.0 tests=FROM_ENDS_IN_NUMS,PLING_PLING 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-PN-SPAMFiltered: yes X-Spam-Rating: 2 Well tonight I finally managed to get the G0MRF transmitter running fine!!! Great to get this far after all the frustrating weeks of experimenting etc......... I took apart another monitor HV-transformer and used this core. I am not sure what caused the problem, but maybe it was because I used an core with no air gap at all. The new core has 2 very thin air gaps, because of the glue I used. This gives lowe inductance, but anyway it works, and thats what counts. Tests has been done at 20V drainvoltage only, and results are very very promising, with efficiency over 90%!! (DCinput vs. RF output) System behaves like an 6.2 Ohm resistor, which will give around 8A drain current at 50V. Next step will be trying to get the SWR protection circuit running, and after that I'll go for 'power' tests on 50V. I would like to thank everybody for their contributions, like answering my questions and giving tips etc. 73! Dick, pa4vhf