Return-Path: Received: from mtain-df06.r1000.mx.aol.com (mtain-df06.r1000.mx.aol.com [172.29.64.218]) by air-da07.mail.aol.com (v129.4) with ESMTP id MAILINDA071-85e94d2b345dec; Mon, 10 Jan 2011 11:31:25 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8F230380000D5; Mon, 10 Jan 2011 11:31:23 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PcKd5-0004IP-6c for rs_out_1@blacksheep.org; Mon, 10 Jan 2011 16:29:59 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PcKd4-0004IG-FN for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 16:29:58 +0000 Received: from out1.ip02ir2.opaltelecom.net ([62.24.128.238]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PcKd2-0001Jw-3k for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 16:29:58 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgQHAKTCKk1cEYrF/2dsb2JhbACISY1vjg9zux2FTASORA X-IronPort-AV: E=Sophos;i="4.60,301,1291593600"; d="scan'208";a="351536153" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.138.197]) by out1.ip02ir2.opaltelecom.net with SMTP; 10 Jan 2011 16:29:49 +0000 Message-ID: <005d01cbb0e3$978f5950$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <004701cbb0d8$25d56e40$0401a8c0@xphd97xgq27nyf> <4D2B293F.80608@telia.com> Date: Mon, 10 Jan 2011 16:29:45 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: Capacitor warning and First 500kHz Class E breadboard 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-global-disposition: G x-aol-sid: 3039ac1d40da4d2b345b7a65 X-AOL-IP: 195.171.43.25 Johan That is what I found adjusting L was a lot easier when setting up the correct waveform ie soft landing g3kev ----- Original Message ----- From: "Johan H. Bodin" To: Sent: Monday, January 10, 2011 3:43 PM Subject: Re: LF: Re: Capacitor warning and First 500kHz Class E breadboard > Andy, > > the last two pages of > > http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%20AACD5-poweramps .pdf > > is a nice and simple guide to the "two dimensional" tuning of the class E > amplifier. The trick is to get Vdrain make a soft landing on the right spot of > the GND runway :-) > > By the way, adjusting L may be easier than adjusting C2, it has the same effect. > > 73 > Johan SM6LKM > > ---- > > Andy Talbot wrote 2011-01-10 16:18: > > Well, the first breadboard with only vaguely correct values worked OK - so it > > doesn't look too be all that critical. Design Q of teh tank circuit is 5, so > > values won't be that important. No need to tap the L measure and get it right > > to start with,then use parallel C to fine tune the finished amp. With this > > sort of Q. "narrow band" for class E probably means > 10kHz >