Return-Path: Received: from rly-md01.mx.aol.com (rly-md01.mail.aol.com [172.20.29.139]) by air-md01.mail.aol.com (v126.13) with ESMTP id MAILINMD011-8e24b4c5c833a2; Tue, 12 Jan 2010 06:27:04 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-md01.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMD012-8e24b4c5c833a2; Tue, 12 Jan 2010 06:27:01 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NUesu-0000FH-FI for rs_out_1@blacksheep.org; Tue, 12 Jan 2010 11:26:04 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NUesu-0000F8-3d for rsgb_lf_group@blacksheep.org; Tue, 12 Jan 2010 11:26:04 +0000 Received: from qmta12.westchester.pa.mail.comcast.net ([76.96.59.227]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NUess-00089H-SD for rsgb_lf_group@blacksheep.org; Tue, 12 Jan 2010 11:26:04 +0000 Received: from omta24.westchester.pa.mail.comcast.net ([76.96.62.76]) by qmta12.westchester.pa.mail.comcast.net with comcast id UbLB1d0031ei1Bg5CbRwdJ; Tue, 12 Jan 2010 11:25:56 +0000 Received: from JAYDELL ([76.23.233.102]) by omta24.westchester.pa.mail.comcast.net with comcast id UbS81d0042DDHkk3kbS87p; Tue, 12 Jan 2010 11:26:08 +0000 Message-ID: <004001ca937a$0143e380$8d01a8c0@JAYDELL> From: To: References: <20100111090709.EAAFE31E706@smtps01.kuleuven.be> <4B4C1D36.3090707@telia.com> Date: Tue, 12 Jan 2010 06:25:54 -0500 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Karma: unknown: X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55 Subject: Re: LF: PA0 into Alaska 600m Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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=0.3 required=5.0 tests=NO_REAL_NAME 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 Andy, Johan The Class E AM guys do this. The amplifier below will do 500 watts at carrier and 150%+ modulation effortlessly. http://www.classeradio.org/class_e_8_fet.pdf Jay W1VD WD2XNS WE2XGR/2 ----- Original Message ----- From: "Johan H. Bodin" To: Sent: Tuesday, January 12, 2010 1:56 AM Subject: Re: LF: PA0 into Alaska 600m > Hi Andy, > > I tried to connect two class E stages in push-pull and it worked as > expected. This was a QRP experiment on 160m but I see no reason why it > shouldn't be scalable. The even harmonic cancellation of the symmetrical > design is welcome since the drain waveform contains quite a lot of 2f. > Each side is designed for half the output power into some R and then the > matching transformer is designed to have 2R looking into the primary. > The two series resonant tanks can be combined into a single one having > half the C and twice the L (as in the attached picture). > > Who will be the first to try a QRO version of this amplifier? :-) > > 73 > Johan SM6LKM > > Andy Talbot wrote: >> All designs & ideas for a 1kW+ Class E PA gratefully accepted :-) >> I do have a 50V 25A PSU, so it 'might' even be feasible. >> >> Two big meaty FETs in parallel may cope. There's an article in the >> latest QEX, just arrived, that appears to run class E stages in parallel >> - but its part of another concept, not targetted at high power /per-se/. > > --------------------------------------------------------------------------------