Return-Path: Received: from rly-dd03.mx.aol.com (rly-dd03.mail.aol.com [172.19.141.150]) by air-dd09.mail.aol.com (v121.5) with ESMTP id MAILINDD091-b6b488395a52e0; Sun, 20 Jul 2008 15:44:48 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dd03.mx.aol.com (v121.5) with ESMTP id MAILRELAYINDD035-b6b488395a52e0; Sun, 20 Jul 2008 15:44:40 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1KKep6-0002pE-0b for rs_out_1@blacksheep.org; Sun, 20 Jul 2008 20:44:00 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1KKep5-0002p5-Bm for rsgb_lf_group@blacksheep.org; Sun, 20 Jul 2008 20:43:59 +0100 Received: from smtp120.mail.mud.yahoo.com ([209.191.84.77]) by relay2.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1KKep4-0002ad-SM for rsgb_lf_group@blacksheep.org; Sun, 20 Jul 2008 20:43:59 +0100 Received: (qmail 17244 invoked from network); 20 Jul 2008 19:43:52 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Received:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=BmXyd5UUaE/NwObM4kvETbk3M8jRYFzQ1KVIUUtBlxyZDt0f+N+veq7SihznLqCxvsVL+2NoR2qsXeTxIXbbVn41Mq7mZTb1lPFQTxcawwtij4IbjyRzC6zYQ8Mx3NUpVah9BRe8TWRseLHLaQATLY+em0WRE4sFX8EI0biNi9c= ; Received: from unknown (HELO lindavideo) (ken.h.wright@btinternet.com@86.134.102.178 with login) by smtp120.mail.mud.yahoo.com with SMTP; 20 Jul 2008 19:43:51 -0000 X-YMail-OSG: JdXC8n4VM1l3hsxFIZLxBus549NBbTt4uAV0WiEziuPaif1MNDp9ScQPvgX2JpeLbTGH2iz2Ck0DknuRMf_Qx8klXZt.ZEU5zuJAbz_IWs3sSssDeW50laRkflajViZSabQuZueBzOBRVNvYxmNOYMM7 X-Yahoo-Newman-Property: ymail-3 Message-ID: <002501c8eaa0$ee4f4ae0$0401a8c0@lindavideo> From: "Ken" To: References: <006e01c8e788$ca7394c0$0900a8c0@AM> <20080717110533.ji3so2ex15i0w8ok@webmail4.kuleuven.be> <487F2369.3701.24D39C@mike.dennison.ntlworld.com> <001901c8ea7c$5c51fb20$0401a8c0@lindavideo> Date: Sun, 20 Jul 2008 20:43:44 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 DomainKey-Status: good (testing) Subject: Re: LF: Re: LF RadCom Articles 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=0.0 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 : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n Hi Andy. A simple L C L circuit as described in the Solid State Design for Radio Amatuers Book, but I made the 'C' variable so I can tune it up in a similar manner to that of PI tank circuit. I dont have any CAD for diagrams, all the pcb artwork was done by hand, I had a bit of techniacl smoke with the first PA a few dead power MOSFETS on the shack floor, but a chat with Chris G3XIZ and it was sorted out. Technical writing is ok as I used to write technical specifications and technical trial reports at BT. 73 Ken M0KHW ----- Original Message ----- From: "Andy Talbot" To: Sent: Sunday, July 20, 2008 6:44 PM Subject: Re: LF: Re: LF RadCom Articles > Send it in - sounds just like the sort of simple 'weekend' article > several technical editors have been asking for. > > btw. By LCL output stage, assume you mean a lowpass Tee network? > > Andy G4JNT > www.scrbg.org/g4jnt > > design >> and build our own equipment, but do not submit it for possible >> publication >> because, state of the art technology it is not, the design is not >> particularly elegant, and the Technical Editor and the more accomplished >> contributors would fall over laughing when they saw it. But most of these >> projects are practical and they work. I work on the KISS (Keep It Simple >> Stupid) principle, don't use three components when one will work just as >> well. My 500kHz TX does not have any fancy CW sidetone circuit on >> transmit, >> just a piezo buzzer wired across the keyed 12v line to the driver board, >> the >> most complicated bit is the LCL output stage, which delivers 23W into a >> 50ohm dummy load and 900mA up the antenna, the TX/RX switching is like >> the >> old days, a simple toggle switch. > > > -- >