Return-Path: Received: from rly-db09.mx.aol.com (rly-db09.mail.aol.com [172.19.130.84]) by air-db07.mail.aol.com (v120.9) with ESMTP id MAILINDB072-ae7472e3f0e2a7; Sun, 04 Nov 2007 16:52:36 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db09.mx.aol.com (v120.9) with ESMTP id MAILRELAYINDB095-ae7472e3f0e2a7; Sun, 04 Nov 2007 16:52:16 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1IonNe-0005h6-4u for rs_out_1@blacksheep.org; Sun, 04 Nov 2007 21:51:42 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1IonNd-0005gx-J5 for rsgb_lf_group@blacksheep.org; Sun, 04 Nov 2007 21:51:41 +0000 Received: from elasmtp-kukur.atl.sa.earthlink.net ([209.86.89.65]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1IonNZ-0002VW-5N for rsgb_lf_group@blacksheep.org; Sun, 04 Nov 2007 21:51:41 +0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=hq8sTHCKtyHil07eu4VpD82m+IZKAorRPp1KZY60xfaQzX9r7dJKB4K0i88cFjdB; h=Received:Reply-To:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:In-Reply-To:Importance:X-ELNK-Trace:X-Originating-IP; Received: from [65.41.23.54] (helo=kd4wov7) by elasmtp-kukur.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1IonN7-0004z3-G1 for rsgb_lf_group@blacksheep.org; Sun, 04 Nov 2007 16:51:09 -0500 From: "kd4wov" To: Date: Sun, 4 Nov 2007 16:51:05 -0500 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 In-Reply-To: <00d701c81f22$3a529960$6401a8c0@JAYTERMINAL> Importance: Normal X-ELNK-Trace: 9f1dd59866ac920e94f5150ab1c16ac01a238acc8405a5b09aaeb6c53fc49d7b52c055193c7c9de2350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 65.41.23.54 X-Karma: 0: DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: RE: 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 : Wow, so you are able to use this class of amps in AM service? Do these amps require additional filtering for harmonics? de kd4wov -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Jay Rusgrove Sent: Sunday, November 04, 2007 15:35 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: CLASS D and E 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 > >