Return-Path: Received: (qmail 23887 invoked from network); 2 Feb 2001 09:48:38 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by 10.226.25.101 with SMTP; 2 Feb 2001 09:48:38 -0000 Received: (qmail 22940 invoked from network); 2 Feb 2001 09:52:17 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 2 Feb 2001 09:52:17 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14OcSZ-0000lS-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 02 Feb 2001 09:24:51 +0000 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14OcSY-0000lN-00 for rsgb_lf_group@blacksheep.org; Fri, 02 Feb 2001 09:24:50 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id JAA31999; Fri, 2 Feb 2001 09:26:17 GMT Received: (qmail 17213 invoked from network); 2 Feb 2001 10:17:50 -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; 2 Feb 2001 10:17:50 -0000 Received: by gauntlet.mail.dera.gov.uk; id KAA16722; Fri, 2 Feb 2001 10:08:25 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma016681; Fri, 2 Feb 01 10:08:04 GMT Received: from FRN-MAIL-3.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Fri, 2 Feb 2001 09:27:57 +0000 Received: by frn-mail-3.dera.gov.uk with Internet Mail Service (5.5.2650.21) id <1ATSNRRQ>; Fri, 2 Feb 2001 09:24:03 -0000 Message-ID: <65AECDF1F89AD411900400508BFC869F0D758E@pdw-mail-1.dera.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: RE: LF: RE: 3C85 Material: Obsolete? Date: Fri, 2 Feb 2001 09:24:13 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) 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: Yes - that's why I'm engineering it so the PTT line operates the chip reset pin and only brings the PSU up via its soft-start on transmit. 'JNT > -----Original Message----- > From: Nick [mailto:maad65@dial.pipex.com] > Sent: 2001-02-01 18:52 > To: rsgb_lf_group@blacksheep.org > Subject: Re: LF: RE: 3C85 Material: Obsolete? > > > 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 > -- 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.