Return-Path: Received: from mtain-df02.r1000.mx.aol.com (mtain-df02.r1000.mx.aol.com [172.29.64.214]) by air-da04.mail.aol.com (v129.4) with ESMTP id MAILINDA043-863c4d6636ae2b3; Thu, 24 Feb 2011 05:45:02 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df02.r1000.mx.aol.com (Internet Inbound) with ESMTP id AC25738000926; Thu, 24 Feb 2011 05:35:14 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PsYVu-0008Si-3Y for rs_out_1@blacksheep.org; Thu, 24 Feb 2011 10:33:38 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PsYVt-0008SZ-GT for rsgb_lf_group@blacksheep.org; Thu, 24 Feb 2011 10:33:37 +0000 Received: from cpsmtpb-ews03.kpnxchange.com ([213.75.39.6]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PsYVs-0002LG-40 for rsgb_lf_group@blacksheep.org; Thu, 24 Feb 2011 10:33:37 +0000 Received: from cpbrm-ews19.kpnxchange.com ([10.94.84.150]) by cpsmtpb-ews03.kpnxchange.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 24 Feb 2011 11:33:30 +0100 Received: from CPSMTPM-CMT106.kpnxchange.com ([195.121.3.22]) by cpbrm-ews19.kpnxchange.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 24 Feb 2011 11:33:29 +0100 Received: from ns94d01ae4d850 ([81.204.139.159]) by CPSMTPM-CMT106.kpnxchange.com with Microsoft SMTPSVC(7.0.6002.18264); Thu, 24 Feb 2011 11:33:29 +0100 Message-ID: <1B8FF617EF514A368E04E69A3E987371@ns94d01ae4d850> From: "henny van elst" To: References: <788033577-1298396905-cardhu_decombobulator_blackberry.rim.net-1949347720-@bda644.bisx.prod.on.blackberry> <4D63FF65.2030204@iup.uni-heidelberg.de> <008101cbd2ca$dafdbd40$4001a8c0@lark> <4D64F0FC.9070807@iup.uni-heidelberg.de> Date: Thu, 24 Feb 2011 11:33:04 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-OriginalArrivalTime: 24 Feb 2011 10:33:29.0613 (UTC) FILETIME=[4701EBD0:01CBD40E] X-RcptDomain: blacksheep.org X-Spam-Score: 3.4 (+++) X-Spam-Report: autolearn=disabled,FORGED_MUA_OUTLOOK=3.36 Subject: Re: LF: Title: Power MOSFET Knock Efficiency Up A Notch Content-Type: text/plain; format=flowed; charset="ISO-8859-15"; reply-type=response 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=FORGED_MUA_OUTLOOK 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: 3039ac1d40d64d66346235a5 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Content-Transfer-Encoding: quoted-printable Hello Stefan,LF The tx is still on,freq.8.970.025Khz, power 100 Wat,but there is no ra= dio=20 amateur around,so the step to your grabber,(396km) is to big, henny pa3cpm 73's ----- Original Message -----=20 From: "Stefan Sch=E4fer" To: Sent: Wednesday, February 23, 2011 12:35 PM Subject: Re: LF: Title: Power MOSFET Knock Efficiency Up A Notch Hi Alan, In a few weeks i am /p in EI for 7...10 days! I'm thinking about beein= g QRV on LF with a "travel-equipment". This might be a 100m kite antenna and a LF TRX and a 12V PA running at up to 30W out. There would be no alternative to a 12 V design! Using such a 12V, 7Ah battery would allo= w some hours of TX activity! :-) 73, Stefan/DK7FC Am 22.02.2011 20:52, schrieb Alan Melia: > Why stick to 12v ?? Best efficiency will always be at higher supply= =20 > voltages > ....also more tractable output impedances. > Alan G3NYK > ----- Original Message ----- > From: "Stefan Sch=E4fer" > To: > Sent: Tuesday, February 22, 2011 6:24 PM > Subject: Re: LF: Title: Power MOSFET Knock Efficiency Up A Notch > > > >> These FETs can be used as a very low-loss electronic switch in 12V >> circuits but are not suitable for a easy PA design (running at 12VD= C). >> Maybe they are difficult to get. An alternative which is easy to ge= t and >> is most suitable for a high power class E PA at 12 VDC is the IRF14= 04 >> >> >> >> 73, Stefan/DK7FC >> >> Am 22.02.2011 18:48, schrieb kd4wov@earthlink.net: >> >>> Could these help in getting the efficiencies higher in LF amps? >>> >>> Granted, these are low power devices. Looks like they are on the= right >>> > track. > >>> >>> >>> >>> > http://electronicdesign.com/article/power/Power-MOSFET-Knock-Efficie= ncy-Up-A-Notch-.aspx?cid=3Ded_productsnewsletter&NL=3D1&YM_RID=3Dkd4wo= v@earthlink.net > >>> Sent via BlackBerry by AT&T >>> >>> >> > ----- Geen virus gevonden in dit bericht. Gecontroleerd door AVG - www.avg.com Versie: 10.0.1204 / Virusdatabase: 1435/3460 - datum van uitgifte: 02/= 22/11