Return-Path: Received: from mtain-dk06.r1000.mx.aol.com (mtain-dk06.r1000.mx.aol.com [172.29.180.10]) by air-da09.mail.aol.com (v129.4) with ESMTP id MAILINDA094-86934d64f53d3de; Wed, 23 Feb 2011 06:53:33 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5E2453800009C; Wed, 23 Feb 2011 06:53:32 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PsDGi-0004ii-99 for rs_out_1@blacksheep.org; Wed, 23 Feb 2011 11:52:32 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PsDGh-0004iZ-LR for rsgb_lf_group@blacksheep.org; Wed, 23 Feb 2011 11:52:31 +0000 Received: from nm13.bullet.mail.ird.yahoo.com ([77.238.189.66]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PsDGf-0005Fc-Le for rsgb_lf_group@blacksheep.org; Wed, 23 Feb 2011 11:52:31 +0000 Received: from [77.238.189.231] by nm13.bullet.mail.ird.yahoo.com with NNFMP; 23 Feb 2011 11:52:23 -0000 Received: from [212.82.108.239] by tm12.bullet.mail.ird.yahoo.com with NNFMP; 23 Feb 2011 11:52:23 -0000 Received: from [127.0.0.1] by omp1004.mail.ird.yahoo.com with NNFMP; 23 Feb 2011 11:52:23 -0000 X-Yahoo-Newman-Id: 942483.69843.bm@omp1004.mail.ird.yahoo.com Received: (qmail 64639 invoked from network); 23 Feb 2011 11:52:23 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-Antivirus:X-Antivirus-Status; b=uoxddJgG2W6hOlvdAnX+rL+vefh5fve1Tl3skj5kSAOAV6SzfUtQ0Y3pOyCbN4WXzp3DzeH4WXZMZbAhv8f1ii89uHmioolyniRd9OX3dJFGdXVtEF+IaClIFCxLn70TgUZO4Ih3+fZEdAIbbZSKXl8fOngTPUoiwJtvu9X9Iu0= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=s1024; t=1298461943; bh=83vgXjYXZyxMPt1fBspi5YCiQcSGMZYtBaCbB/bTWv4=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-Antivirus:X-Antivirus-Status; b=AeE88snUlM1VBWncbbiQyLEAOwieZNkzbLjl1NRzXofyhKzBHmBPUzHQ8T0hSCCwssRgH20X/reT3BS9qlrxzuLE4/7dMJY9xoF4EWAPdRyBEb5Eoqby2SJoUh/jEuT3caouB8S58frj9BLUo9u/DUARjNm6Dqve/zOmagmgwak= Received: from lark (alan.melia@86.172.185.204 with login) by smtp817.mail.ird.yahoo.com with SMTP; 23 Feb 2011 11:52:20 +0000 GMT X-Yahoo-SMTP: fpz.2VeswBBs59bVshRPmMN51lcO2lgFRIvE4XTqE8dRwOxd70E- X-YMail-OSG: BjcvnQIVM1kFPOTIjvZ1KP4lHySnaR9TmTiX7OLCfW25IuK RLS94XfiycNiMsJboQ0WTW7bJ5GQOSHKj2GWWUpFHSUxwIj9FDVwQIy.LlS4 lUN.fax4geO.hPBks6qI7AlG1IZk5jPa1vBNO5CK1iJ_iZJmWopzM9N1it9x hjckMMghxSrcUSwweOk4gz1CQvdTxCfrZFMOFcRpllC2fkdYy43yvuOuKxeF EdAVPgvcxK81yr9WEa3dqrLDf7wTceP6UuKuuLTmYKKqNUrugCfqlliuohJN uUaGOdezeByam5HqCar55jnq1VgjGqdU- X-Yahoo-Newman-Property: ymail-3 Message-ID: <005301cbd350$25fdb720$4001a8c0@lark> From: "Alan Melia" To: References: <788033577-1298396905-cardhu_decombobulator_blackberry.rim.net-1949347720-@bda644.bisx.prod.on.blackberry> <4D63FF65.2030204@iup.uni-heidelberg.de> <008101cbd2ca$dafdbd40$4001a8c0@lark> <4D64F0FC.9070807@iup.uni-heidelberg.de> Date: Wed, 23 Feb 2011 11:52:27 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.2001 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.2001 X-Antivirus: avast! (VPS 110222-1, 22/02/2011), Outbound message X-Antivirus-Status: Clean DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: Title: Power MOSFET Knock Efficiency Up A Notch Content-Type: text/plain; charset="ISO-8859-15" 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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m234.2 ; domain : btinternet.com DKIM : pass x-aol-sid: 3039ac1db40a4d64f53b102d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Content-Transfer-Encoding: quoted-printable Hi Stefan, Ah I wasn't thinking of /p operation....you need a mule to= carry more batteries :-)) Alan G3NYK ----- Original Message -----=20 From: "Stefan Sch=E4fer" To: Sent: Wednesday, February 23, 2011 11:35 AM 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 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-Efficienc= y-Up-A-Notch-.aspx?cid=3Ded_productsnewsletter&NL=3D1&YM_RID=3Dkd4wov@= earthlink.net > >>> Sent via BlackBerry by AT&T >>> >>> >> >