Return-Path: Received: from rly-mg06.mx.aol.com (rly-mg06.mail.aol.com [172.20.83.112]) by air-mg07.mail.aol.com (v120.9) with ESMTP id MAILINMG074-a1d474b248e331; Mon, 26 Nov 2007 14:55:11 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mg06.mx.aol.com (v120.9) with ESMTP id MAILRELAYINMG067-a1d474b248e331; Mon, 26 Nov 2007 14:54:56 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Iwk2Y-00029v-Jl for rs_out_1@blacksheep.org; Mon, 26 Nov 2007 19:54:46 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Iwk2Y-00029m-6V for rsgb_lf_group@blacksheep.org; Mon, 26 Nov 2007 19:54:46 +0000 Received: from smtp-out3.libero.it ([212.52.84.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Iwk2V-0001ww-EP for rsgb_lf_group@blacksheep.org; Mon, 26 Nov 2007 19:54:46 +0000 Received: from mailrelay11.libero.it (192.168.32.128) by smtp-out3.libero.it (7.3.120) id 4688F31B0FBDF5DB for rsgb_lf_group@blacksheep.org; Mon, 26 Nov 2007 20:54:34 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AusRANuzSkfD0kEp/2dsb2JhbACBVA Received: from wca21.libero.it (HELO enri) ([195.210.65.41]) by outrelay11.libero.it with SMTP; 26 Nov 2007 20:54:28 +0100 Received: from ppp-161-46.24-151.libero.it (pre@ppp-161-46.24-151.libero.it [151.24.46.161]) by wca21.libero.it (SlipStream SP Server 5.0.154 built 2006/05/15 18:21:44 -0400 (EDT)); Mon, 26 Nov 2007 20:54:29 +0100 (CET) X-Originating-IP: [151.24.46.161] X-Originating-User: [pre] From: "Enrico" To: Date: Mon, 26 Nov 2007 20:52:07 +0100 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 V6.00.2900.2180 In-Reply-To: <000701c829fb$53914aa0$47e8fc3e@g3kev> Importance: Normal X-Karma: -1000: uceprotect.blacklist: if-bad(0) => return-bad(1.0) X-Spam-Score: 1.0 (+) X-Spam-Report: autolearn=disabled,FORGED_MUA_OIMO=0.981 Subject: LF: R: classs 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=2.7 required=5.0 tests=FORGED_MUA_OIMO 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 : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n Hi Mal, can you please tell me what kind of PA are you using? Have you an electrical scheme? Thank you an Bye. IW4CXL Enrico -----Messaggio originale----- Da: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]Per conto di hamilton mal Inviato: domenica 18 novembre 2007 16.54 A: rsgb Oggetto: LF: classs E Hi all I carried out some analysis on my fet pa today to check the waveform for true class E. Monitoring the drain on a scope revealed that the waveform was almost correct but needed a slight increase in capacity for C2 for an almost perfect switch at 502.5 khz. Increasing/decreasing the voltage did not make a big difference to the waveform, at the design voltage it was only slightly better. Using a DL I altered the freq and found the perfect waveform at 535.9 khz, so I expect logically increasing the value of C2 would correct the anamoly at 502.5 khz. I have not altered it yet because I do not have a suitable capicator. I did observe some ripple on the waveform that is probably caused by feed through from the driver, it was more pronunced at a V lower than the design voltage, but improved with a V increase. In spite of the above observations the PA performs well and seems very robust. The RF pwr out measurements using the DL or the Antenna do not vary, indicating that the antenna is well matched to 50 ohms via the atu at the base of the inv L. I thought the above observations might be interesting to would be class E constructors. Considering mine was built from junk box bits, including the 60 year old ceramic ex TU5 tuning unit coil it works very well. The fet is out of an old marine tx. Best dx to date VE1ZZ at 549 during ideal conditions last week. 73 de Mal/G3KEV