Return-Path: Received: (qmail 13973 invoked from network); 1 Feb 2001 18:56:27 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by extortion.plus.net with SMTP; 1 Feb 2001 18:56:27 -0000 Received: (qmail 20290 invoked from network); 1 Feb 2001 18:59:18 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 1 Feb 2001 18:59:18 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14OOrF-0004z2-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 01 Feb 2001 18:53:25 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from tungsten.btinternet.com ([194.73.73.81]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14OOrE-0004yx-00 for rsgb_lf_group@blacksheep.org; Thu, 01 Feb 2001 18:53:24 +0000 Received: from [62.7.37.62] (helo=host62-7-37-62.btinternet.com) by tungsten.btinternet.com with smtp (Exim 3.03 #83) id 14OOqx-00021s-00 for rsgb_lf_group@blacksheep.org; Thu, 01 Feb 2001 18:53:10 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 From: "Nick" To: rsgb_lf_group@blacksheep.org Subject: Re: LF: RE: 3C85 Material: Obsolete? Date: Thu, 01 Feb 2001 18:52:06 +0000 Message-ID: <91cj7tcua3pms1jj0odoengrktamr2uklk@4ax.com> References: <65AECDF1F89AD411900400508BFC869F0D758D@pdw-mail-1.dera.gov.uk> In-reply-to: <65AECDF1F89AD411900400508BFC869F0D758D@pdw-mail-1.dera.gov.uk> X-Mailer: Forte Agent 1.8/32.548 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: On Thu, 1 Feb 2001 13:02:29 -0000 , you wrote: >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. > Good reason, it is just that the EMC engineer in me has a pronounced dislike of any switching devices near radios! Nick