Return-Path: Received: (qmail 15284 invoked from network); 25 Jun 2001 22:05:47 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 25 Jun 2001 22:05:47 -0000 Received: (qmail 26817 invoked from network); 25 Jun 2001 17:43:27 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 25 Jun 2001 17:43:27 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15EaE5-0007tM-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 25 Jun 2001 18:32:41 +0100 Received: from smtp-1.visp.telinco.net ([212.1.130.1]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15EaE1-0007tH-00 for rsgb_lf_group@blacksheep.org; Mon, 25 Jun 2001 18:32:37 +0100 Received: from [212.1.148.141] (helo=g4jnt) by smtp-1.visp.telinco.net with smtp (Exim 3.22 #1) id 15EZwN-0003LQ-00 for rsgb_lf_group@blacksheep.org; Mon, 25 Jun 2001 18:14:23 +0100 Message-ID: <000e01c0fd9b$ac246b40$8d9401d4@g4jnt> From: "Andrew Talbot" To: rsgb_lf_group@blacksheep.org Subject: LF: Re: Re: RE: LX1PD Date: Mon, 25 Jun 2001 18:24:20 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.1 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Why ? I did look at this, and came to the conculsion : Peak of one cycle falling to the 60 degree point, SIN(60) = 0.866. So ripple = 1 - 0.866 = .134 hence 13.4% I did hear once that some high power transmitters do not use decoupling caps in their PSUs, and if the 3-phase ripple is only 4% that may explain how they can get away with it. Andy - off to have a look at a textbook on heavy electrical power engineering. -----Original Message----- From: John Rabson To: rsgb_lf_group@blacksheep.org Date: 25 June 2001 16:22 Subject: LF: Re: RE: LX1PD >I think its 4%! > >73 de >John Rabson G3PAI > >----- Original Message ----- >From: "Talbot Andrew" >To: >Sent: Monday, June 25, 2001 2:03 PM >Subject: LF: RE: LX1PD > > >> That's set me thinking evil thoughts ....... >> >> 600V Mosfets in bridge. 3 phase rectifier giving 13% ripple even without >> any decoupling caps, at a ripple freq of 300Hz. 10kW perhaps ! >> >> Andy G4JNT >> >> >> > voltage comes from six-phase rectification of the >> > 220/380V mains >> > without a transformer. >> > >> > >> >> >> -- >> The Information contained in this E-Mail and any subsequent correspondence >> is private and is intended solely for the intended recipient(s). >> For those other than the recipient any disclosure, copying, distribution, >> or any action taken or omitted to be taken in reliance on such information >is >> prohibited and may be unlawful. >> >> > > >