Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mh02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8C50138000087; Mon, 10 Sep 2012 13:15:54 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TB7Yk-0004NH-1i for rs_out_1@blacksheep.org; Mon, 10 Sep 2012 18:14:06 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TB7Yj-0004N8-Gb for rsgb_lf_group@blacksheep.org; Mon, 10 Sep 2012 18:14:05 +0100 Received: from out1.ip07ir2.opaltelecom.net ([62.24.128.243]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TB7Yh-00059A-79 for rsgb_lf_group@blacksheep.org; Mon, 10 Sep 2012 18:14:04 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AswHAJEeTlBcHnUy/2dsb2JhbABFhgeELq8MggGBCIIbBQEBBAEIAQEDFg8BIwImBgEBAwUCAQMRBAEBAwIFIQICFAEEGgYWCAYTCgECAgEBh20DCQoHqEuJCgyJVIEhiXIbgnyCDYESA41hmBmCZoFaIw X-IronPort-AV: E=Sophos;i="4.80,398,1344207600"; d="scan'208";a="46979222" Received: from host-92-30-117-50.as13285.net (HELO xphd97xgq27nyf) ([92.30.117.50]) by out1.ip07ir2.opaltelecom.net with SMTP; 10 Sep 2012 18:14:01 +0100 Message-ID: <001b01cd8f77$a9b4a1c0$0501a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <504E0AD2.7020205@freenet.de> Date: Mon, 10 Sep 2012 17:13:57 -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-Spam-Score: 3.8 (+++) 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: Wolf Overall considerations, Data modes that need Linear amps are very inefficient. It is preferable to choose modes that use C, D or E amplifiers like CW or QRSS one level demodulation. Two level might be a consideration like OPERA. Linear AB2 etc 40% efficient, class D or E 90% . It is the same with SSB that needs a linear amp whereas CW with a class D is way ahead at 90% plus efficiency. [...] Content analysis details: (3.8 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [62.24.128.243 listed in list.dnswl.org] 1.3 FSL_XM_419 Old OE version in X-Mailer only seen in 419 spam -0.0 SPF_PASS SPF: sender matches SPF record 1.0 FSL_UA FSL_UA 1.5 AXB_XMAILER_MIMEOLE_OL_024C2 AXB_XMAILER_MIMEOLE_OL_024C2 X-Scan-Signature: 1e15d6d6179985f133b43d42d658878a Subject: Re: LF: Re: Re: Re: DK0SWF antenna Content-Type: text/plain; charset="UTF-8" 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=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-global-disposition: G x-aol-sid: 3039ac1d60d6504e204a467d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Wolf Overall considerations, Data modes that need Linear amps are very inefficient. It is preferable to choose modes that use C, D or E amplifiers like CW or QRSS one level demodulation. Two level might be a consideration like OPERA. Linear AB2 etc 40% efficient, class D or E 90% . It is the same with SSB that needs a linear amp whereas CW with a class D is way ahead at 90% plus efficiency. mal/g3kev ----- Original Message ----- From: "wolf_dl4yhf" To: Sent: Monday, September 10, 2012 3:44 PM Subject: Re: LF: Re: Re: Re: DK0SWF antenna > Hello Christian, > > I have a few MOSFETs type HUF 75343 P3 to donate... they are 75 A, 55 V, > and Rds_on = 9 mOhm. > Only disadvantage is a relatively large gate capacitance, but despite > that they work reasonably well in my MF PA (in linear mode, with very > low impedance drive). I originally used them in my LF transverter, where > I never managed to kill any. Despite their "270 Watts" dissipated power > rating they need good cooling when operated in linear mode. > > HW ? > > 73, > Wolf DL4YHF > (QRL: Bünde, not very far from you...) > > > Am 10.09.2012 00:03, schrieb C. Groeger: > > Hello Stefan, > > Sorry, my tx broke down, I had to stop. > > You were here 599 as strong as Wolf df0wd who is my mf neighbour! > > I'll Call you again next week with new mos fets... > > > > 73 > > Df5qg > > > > Christian Groeger > > > > Stefan Schäfer schrieb: > > > >> I'll join in too, soon. My temporary MF grabber is at > >> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_MF_Grabber.html, > >> active during i am active... > >> > >> 73, Stefan > >> > >> Am 09.09.2012 21:24, schrieb C. Groeger: > >>> Ok, mal...give me 10 minutes, I'll be there! > >>> > >>> Christian Groeger > >>> > >>> mal hamilton schrieb: > >>> > >>> > >>>> Christian > >>>> Looking out for you at present on 472.5 but nil hrd so far. Just had a QSO > >>>> with DF0WD > >>>> 73 De mal/g3kev > >>>> > >