Return-Path: Received: (qmail 99817 invoked from network); 30 May 2004 07:48:41 -0000 Received: from unknown (HELO ptb-mxscan01.plus.net) (212.159.14.235) by ptb-mailstore03.plus.net with SMTP; 30 May 2004 07:48:41 -0000 Received: (qmail 22359 invoked from network); 30 May 2004 07:48:41 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore01.plus.net (212.159.14.215) by ptb-mxscan01.plus.net with SMTP; 30 May 2004 07:48:40 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1BUL3g-0005Zu-Am for dave@picks.force9.co.uk; Sun, 30 May 2004 07:48:40 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1BUL2I-00038g-Oe for rs_out_1@blacksheep.org; Sun, 30 May 2004 08:47:14 +0100 Received: from [213.232.95.59] (helo=relay.salmark.net) by post.thorcom.com with esmtp (Exim 4.14) id 1BUL2I-00038X-89 for rsgb_lf_group@blacksheep.org; Sun, 30 May 2004 08:47:14 +0100 Received: from postbode01.zonnet.nl ([62.58.50.88]) by relay.salmark.net with esmtp (Exim 4.24) id 1BURao-0004H9-Ms for rsgb_lf_group@blacksheep.org; Sun, 30 May 2004 15:47:18 +0100 Received: (qmail 15006 invoked by uid 10); 30 May 2004 07:47:02 -0000 Received: (vexira-qq 14996-C95784D7 invoked from network) 30 May 2004 09:47:01 +0200 X-Fake-Domain: unknown Received: from unknown (HELO ibm) ([62.59.190.154]) (envelope-sender ) by postbode01.zonnet.nl (qmail-ldap-1.03) with SMTP for < >; 30 May 2004 07:47:01 -0000 X-Bad-Message-ID: no DNS (ibm) Message-ID: <003001c44618$da3ce5c0$2102000a@ibm> From: "Dick" To: rsgb_lf_group@blacksheep.org Date: Sun, 30 May 2004 09:26:57 +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: 6.25.0.60; VDF: 6.25.0.80; host: postbode01.zonnet.nl) X-Spam-Score: 1.0 (+) X-Spam-Report: autolearn=no,FROM_ENDS_IN_NUMS=0.869,RCVD_IN_SORBS=0.1 Subject: LF: G0MRF-TX SWR protection circuit 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 Hello all, With the transmitter working well now, I need to check the protection systems. Current protection works good and turned out to be very fast. I have some troubles in adjusting the SWR protection circuit. With no load after the filter, so when antenna is not connected for example, the drain-current is very low, and so the output. Anyway, I found it difficult to adjust the SWR-circuit as the variable resistors seems to effect each other. I wonder if anyone has tips about this. Long duration high power tests will be done later.... Running two IRFP260N FET's, which much must be capable of handling 11A current easy....... Although not recommended I will try and see what happens with 550W input...... In worst case I have to replace them...... 73 Dick, pa4vhf