Return-Path: Received: from mtain-dd07.r1000.mx.aol.com (mtain-dd07.r1000.mx.aol.com [172.29.64.147]) by air-de02.mail.aol.com (v126.13) with ESMTP id MAILINDE023-5ea84b4c1d953ad; Tue, 12 Jan 2010 01:58:29 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dd07.r1000.mx.aol.com (Internet Inbound) with ESMTP id BFEFE3800007F; Tue, 12 Jan 2010 01:58:27 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NUagY-0007aN-0O for rs_out_1@blacksheep.org; Tue, 12 Jan 2010 06:57:02 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NUagX-0007aE-Db for rsgb_lf_group@blacksheep.org; Tue, 12 Jan 2010 06:57:01 +0000 Received: from pne-smtpout1-sn1.fre.skanova.net ([81.228.11.98]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NUagV-0003hT-QA for rsgb_lf_group@blacksheep.org; Tue, 12 Jan 2010 06:57:01 +0000 Received: from [127.0.0.1] (81.235.167.68) by pne-smtpout1-sn1.fre.skanova.net (7.3.140.3) (authenticated as u33233109) id 4AE169E6009C4FCA for rsgb_lf_group@blacksheep.org; Tue, 12 Jan 2010 07:56:54 +0100 Message-ID: <4B4C1D36.3090707@telia.com> Date: Tue, 12 Jan 2010 07:56:54 +0100 From: "Johan H. Bodin" User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <20100111090709.EAAFE31E706@smtps01.kuleuven.be> In-Reply-To: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: PA0 into Alaska 600m Content-Type: multipart/mixed; boundary="------------070600010504080809050006" 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-VSS-INFO: 5400.1158/52684 X-AOL-VSS-CODE: Scan Clean x-aol-sid: 3039ac1d40934b4c1d932352 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) X-AOL-VSS-INFO: 5400.1158/0 --------------070600010504080809050006 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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/. --------------070600010504080809050006 Content-Type: image/gif; name="e_pp.gif" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="e_pp.gif" R0lGODlh7AJfAfcAAAAAAAAA/wBK/wBz/wCEAACEhACElACErQCUlACUxgCtrQCt3jkAAEoA/0pK /0pz/0qEhEqElEqErUqUrUqUxkqc/0qtrUqtxkqt3krG3krG73MA/3NK/3Nz/3OEhHOElHOErXOU hHOUxnOtlHO9/3PGxnPe/5xK/5xz/5yUhJyUlJyUrZyc/5ytrZy9/5ze/5zv75zv/71z/72c/72t hL2tlL3GlL3e773e/73/3r3//96c/969/97GlN7e/97vxt7v3t7v/97///8AAP8ASv8Ac/9KAP9K Sv9Kc/9KnP9zAP9zSv9zvf+cSv+c3v+9c/+9///enP/erf/e///vxv/v7///vf//3v//7/////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// 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