Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk02.r1000.mx.aol.com (Internet Inbound) with ESMTP id C968638000090; Mon, 12 Nov 2012 05:20:50 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TXr7X-0006Bx-52 for rs_out_1@blacksheep.org; Mon, 12 Nov 2012 10:19:59 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TXr7W-0006Bo-PR for rsgb_lf_group@blacksheep.org; Mon, 12 Nov 2012 10:19:58 +0000 Received: from nina.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1TXr7U-00041u-RD for rsgb_lf_group@blacksheep.org; Mon, 12 Nov 2012 10:19:57 +0000 Received: from plato.ucs.mun.ca (plato.ucs.mun.ca [134.153.232.153]) by nina.ucs.mun.ca (8.13.1/8.13.1) with ESMTP id qACAJrxR029801 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 12 Nov 2012 06:49:53 -0330 Date: Mon, 12 Nov 2012 06:49:53 -0330 (NST) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: LF Group In-Reply-To: <3816C61C35B545F7A7A7E8A1BD2A7CAF@GaryAsus> Message-ID: References: <3816C61C35B545F7A7A7E8A1BD2A7CAF@GaryAsus> MIME-Version: 1.0 X-MUN-Disclaimer: http://www.mun.ca/cc/policies/elect_communications_disclaimer_2012.php X-Spam-Score: 1.1 (+) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: GM Gary and Group, Thank-you for the report. The TX was the original 100 watt unit (Jul '05 QST) somewhat modified. After frying many FETS over the past decade, a 4427 driver and IRFP260 hexfet was tried. It seems this FET had too much gate capacitance for the totem pole driver, hence the 4427. The gate waveform looks a lot better and the heatsink was cool this morning, presumably because the RDS was lower than that for the IRF640. [...] Content analysis details: (1.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.2 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 1.3 GAPPY_SUBJECT Subject: contains G.a.p.p.y-T.e.x.t X-Scan-Signature: 87966b345956c8ef3389b993f6a18f4e Subject: Re: [O_P_E_R_A_] Re: LF: VO1NA OP32 137.777 kHz Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.6 required=5.0 tests=GAPPY_SUBJECT,NO_REAL_NAME 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-global-disposition: G x-aol-sid: 3039ac1d618650a0cd822469 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none GM Gary and Group, Thank-you for the report. The TX was the original 100 watt unit (Jul '05 QST) somewhat modified. After frying many FETS over the past decade, a 4427 driver and IRFP260 hexfet was tried. It seems this FET had too much gate capacitance for the totem pole driver, hence the 4427. The gate waveform looks a lot better and the heatsink was cool this morning, presumably because the RDS was lower than that for the IRF640. The Decca is on standby after a heart-breaking experience. More on that later... Thanks to you Gary and the others who operate the grabber services. 73 Joe VO1NA This electronic communication is governed by the terms and conditions at http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2012.php