Return-Path: Received: (qmail 29766 invoked from network); 31 May 2002 10:24:11 -0000 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Received: from unknown (HELO marstons.services.quay.plus.net) (212.159.14.223) by excalibur.plus.net with SMTP; 31 May 2002 10:24:11 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 18545 invoked by uid 10001); 31 May 2002 10:28:03 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 31 May 2002 10:28:03 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17DjHb-00017u-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 31 May 2002 11:05:19 +0100 Received: from anchor-post-34.mail.demon.net ([194.217.242.92]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17DjHa-00017o-00 for rsgb_lf_group@blacksheep.org; Fri, 31 May 2002 11:05:18 +0100 Received: from telemetry.demon.co.uk ([194.222.19.114]) by anchor-post-34.mail.demon.net with esmtp (Exim 3.35 #1) id 17DjHP-000GTQ-0Y for rsgb_lf_group@blacksheep.org; Fri, 31 May 2002 11:05:08 +0100 Message-ID: Date: Fri, 31 May 2002 08:54:05 +0100 To: rsgb_lf_group@blacksheep.org From: "Tom Boucher" Subject: Re: LF: Decca component In-reply-to: <11c.11de4ef1.2a280dd0@aol.com> MIME-Version: 1.0 X-Mailer: Turnpike Version 3.03a Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: I reckon the use of those 'MOV's in the Decca is a bit belt-and-braces anyway because both output ports are diode clamped to positive and negative rails. Maybe they are faster than the diodes and protect against fast spikes. Cheers, Tom G3OLB G0MRF wrote: > >It should be possible to determine the voltage rating of the MOV from the >manufacturers part number in the Decca manual. If the original part is not >available I wonder if its possible to remove a working unit from one of the >other modules and measure its capacitance and compare the value against a >potential replacement. Hopefully minor differencies would not be critical as >the MOV is in part of the circuit operating in class D and there should be >sufficient drive to mask small changes in capacitance.