Return-Path: Received: from rly-mc03.mail.aol.com (rly-mc03.mail.aol.com [172.20.118.145]) by air-mc03.mail.aol.com (v120.9) with ESMTP id MAILINMC32-115472e2d4e49; Sun, 04 Nov 2007 15:36:53 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mc03.mail.aol.com (v120.9) with ESMTP id MAILRELAYINMC37-115472e2d4e49; Sun, 04 Nov 2007 15:36:33 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1IomC0-0004mc-9j for rs_out_1@blacksheep.org; Sun, 04 Nov 2007 20:35:36 +0000 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1IomBz-0004mT-GV for rsgb_lf_group@blacksheep.org; Sun, 04 Nov 2007 20:35:35 +0000 Received: from qmta05.westchester.pa.mail.comcast.net ([76.96.62.48]) by relay2.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1IomBv-0006jG-P0 for rsgb_lf_group@blacksheep.org; Sun, 04 Nov 2007 20:35:35 +0000 Received: from OMTA04.westchester.pa.mail.comcast.net ([76.96.62.35]) by QMTA05.westchester.pa.mail.comcast.net with smtp id 8k6S1Y0020ldTLk0001y00; Sun, 04 Nov 2007 20:35:20 +0000 Received: from JAYTERMINAL ([71.234.114.84]) by OMTA04.westchester.pa.mail.comcast.net with comcast id 8kbQ1Y0041pKLLP0000000; Sun, 04 Nov 2007 20:35:24 +0000 X-Authority-Analysis: v=1.0 c=1 a=dfETk20xVif_qPf-SDUA:9 a=MBB6PDRx9tsm_nESBPzFGR3fCL0A:4 a=O58u2wXj750A:10 a=wk6s2zzMB60A:10 a=gi0PWCVxevcA:10 Message-ID: <00d701c81f22$3a529960$6401a8c0@JAYTERMINAL> From: "Jay Rusgrove" To: References: <000701c81ede$3af050e0$1ae4fc3e@g3kev> Date: Sun, 4 Nov 2007 15:35:24 -0500 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Spam-Score: 0.3 (/) X-Spam-Report: autolearn=disabled,AWL=0.305 Subject: LF: Re: CLASS D and E Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit 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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : I run voltage-mode class D amplifiers (400 watts) on 137 and 505 as well as PDM modulated current-mode class D AM transmitters on 160 and 75 meters (375 watt carrier). Efficiency in all cases is in the low 90s. The best I've been able to achieve on 40 meters is 90%. Jay W1VD WD2XNS WE2XGR/2 ----- Original Message ----- From: "hamilton mal" To: "rsgb" Sent: Sunday, November 04, 2007 7:28 AM Subject: LF: CLASS D and E > Hi all > Class D and E amplifiers are supposed to give around 80/90 % efficiency. Has > anyone actually achieved these figures. It seems anything above 60% is hard > to arrive at using normal coils/capacitors. > > 73 de Mal/G3KEV > >