Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 82C3738000095; Tue, 18 Dec 2012 18:32:30 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Tl6dE-0007N1-Jl for rs_out_1@blacksheep.org; Tue, 18 Dec 2012 23:31:28 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Tl6dE-0007Mr-4n for rsgb_lf_group@blacksheep.org; Tue, 18 Dec 2012 23:31:28 +0000 Received: from smtpout2.wanadoo.co.uk ([80.12.242.42] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Tl6dC-0005bG-6i for rsgb_lf_group@blacksheep.org; Tue, 18 Dec 2012 23:31:27 +0000 Received: from AGB ([2.26.47.56]) by mwinf5d26 with ME id dBX51k00d1CjwNS03BX5wv; Wed, 19 Dec 2012 00:31:05 +0100 Message-ID: <83EEBFC65ED94B0880138E0637A84E24@AGB> From: "Graham" To: References: <20121218092921.Horde.h2yZX_rSz0VQ0BtRPVIC2uA@posti.anvianet.fi><20121218100332.Horde.2ASBc_rSz0VQ0CNU8mNkBhA@posti.anvianet.fi><20121218152622.Horde.XfcUIerSz0VQ0G7_VqKUnlA@posti.anvianet.fi> In-Reply-To: Date: Tue, 18 Dec 2012 23:31:05 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.2 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Why the stabilised screen supply ? G.. From: "Dimitrios Tsifakis" Sent: Tuesday, December 18, 2012 9:07 PM To: Subject: Re: LF: Better picture of the 807 based 500kHz TX [...] Content analysis details: (0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.42 listed in list.dnswl.org] 0.2 STOX_REPLY_TYPE STOX_REPLY_TYPE X-Scan-Signature: bb61bee384896e075004ae5ec954ddd2 Subject: Re: LF: Better picture of the 807 based 500kHz TX 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=0.1 required=5.0 tests=MISSING_OUTLOOK_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-global-disposition: G x-aol-sid: 3039ac1d600c50d0fd0d0a8f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Why the stabilised screen supply ? G.. -------------------------------------------------- From: "Dimitrios Tsifakis" Sent: Tuesday, December 18, 2012 9:07 PM To: Subject: Re: LF: Better picture of the 807 based 500kHz TX > By the way, here is my current 40 m 807 transmitter.This was the first > attempt at building a valve TX. > > people.physics.anu.edu.au/~dxt103/valves/807/ > > I will use the same type of chassis for the 472 kc version but I will > use an old 450-0-450 (50 mA), transformer which also has a 225-0-225 > and 6.3 windings, for a more compact result. My hope is that I can > draw a bit more than 50 mA without overheating the transformer and is > based on the fact that CW is not 100% duty cycle and also I am not > using the other windings to their maximum current ratings. > > 73, Dimitris VK1SV >