Return-Path: Received: (qmail 28555 invoked from network); 1 Feb 2001 13:06:56 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by 10.226.25.101 with SMTP; 1 Feb 2001 13:06:56 -0000 Received: (qmail 22743 invoked from network); 1 Feb 2001 13:10:32 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 1 Feb 2001 13:10:32 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14OJOZ-000350-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 01 Feb 2001 13:03:27 +0000 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14OJOX-00034u-00 for rsgb_lf_group@blacksheep.org; Thu, 01 Feb 2001 13:03:25 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id NAA27138; Thu, 1 Feb 2001 13:04:50 GMT Received: (qmail 14858 invoked from network); 1 Feb 2001 13:56:26 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 1 Feb 2001 13:56:26 -0000 Received: by gauntlet.mail.dera.gov.uk; id NAA11205; Thu, 1 Feb 2001 13:47:06 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma011119; Thu, 1 Feb 01 13:46:27 GMT Received: from frn-gold-1.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Thu, 1 Feb 2001 13:06:12 +0000 Received: by frn-gold-1.dera.gov.uk with Internet Mail Service (5.0.1460.8) id <1ATQD541>; Thu, 1 Feb 2001 13:02:29 -0000 Message-ID: <65AECDF1F89AD411900400508BFC869F0D758D@pdw-mail-1.dera.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: RE: LF: RE: 3C85 Material: Obsolete? Date: Thu, 1 Feb 2001 13:02:29 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.0.1460.8) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: A pair of car batteries used on a /P expedition could easily discharge to 20V. The modern high power DMOS devices (for 1.3, 2.3 and 3.4 GHz) that this PSU is aimed at powering like a constant 28V Vcc so a straightforward SMPSU looks the obvious solution. If two batteries have to be used, then used in parallel they can be charged together from a car engine. Also, the same PSU design can be adapted for 50V devices which would need 4 batteries in series. Andy G4JNT > -----Original Message----- > From: Nick [mailto:maad65@dial.pipex.com] > Sent: 2001-02-01 11:39 > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: RE: 3C85 Material: Obsolete? > On Wed, 31 Jan 2001 14:55:04 -0000, you wrote: > > >As part of a project for the other end of the spectrum, I'm in the > >process of designing a 300 - 400W SMPSU for converting a 12V > car battery > >supply to 28V so will be looking into similar sized cores as > needed for > >137kHz kW systems. > > How about a second car battery in series?? You can add a > small invertor to > charge it off the original is you want long term operation > with the engine > running. > > Nick > -- 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.