Return-Path: Received: (qmail 517 invoked from network); 8 Oct 2001 18:25:54 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 8 Oct 2001 18:25:54 -0000 Received: (qmail 4566 invoked from network); 8 Oct 2001 18:23:36 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 8 Oct 2001 18:23:36 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15qevg-0002G5-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 08 Oct 2001 19:15:04 +0100 Received: from mta5-rme.xtra.co.nz ([210.86.15.138]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15qeve-00028N-00 for rsgb_lf_group@blacksheep.org; Mon, 08 Oct 2001 19:15:03 +0100 Received: from xtr743187 ([202.27.181.6]) by mta5-rme.xtra.co.nz (InterMail vM.5.01.03.02 201-253-122-118-102-20010403) with SMTP id <20011008181348.CDOD11927.mta5-rme.xtra.co.nz@xtr743187> for ; Tue, 9 Oct 2001 07:13:48 +1300 Message-ID: <001c01c15025$32700a20$06b51bca@xtr743187> From: "Vernall" To: rsgb_lf_group@blacksheep.org References: <002501c1500c$402cec00$9edcff3e@oemcomputer> Subject: LF: Re: Power Supply Date: Tue, 9 Oct 2001 07:03:13 +1300 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 5.00.2919.6600 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: Pete, > Hi, I am thinking of buying a new PSU, has anyone any experience with Switch > Mode PSU's. Is there any sproggies on 137Kz? The PSU I am particularly > interested in is the Diamond GZV-2500, any advice welcome. Still just a SWL > on VLF but that could change soon, 73 Pete G3KNU My advice is to use linear regulated power supplies if you want to avoid self-inflicted QRM on the lower bands. QST had some reviews of switch mode power supplies a few months back, and that included a wideband spectrum analyser graphic for each one tested. Each graphic showed that spurious emissions are present, and increase at the lower end of the spectrum. 73, Bob