Return-Path: Received: (qmail 10130 invoked from network); 4 Nov 2002 17:43:42 -0000 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 4 Nov 2002 17:43:42 -0000 Received: (qmail 25148 invoked by uid 10001); 4 Nov 2002 18:46:44 -0000 Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 4 Nov 2002 18:46:44 -0000 Received: from majordom by post.thorcom.com with local (Exim 4.10) id 188lCG-0005U2-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 04 Nov 2002 17:39:32 +0000 Received: from [194.73.73.176] (helo=protactinium.btinternet.com) by post.thorcom.com with esmtp (Exim 4.10) id 188lCG-0005Tt-00 for rsgb_lf_group@blacksheep.org; Mon, 04 Nov 2002 17:39:32 +0000 Received: from host213-122-84-100.in-addr.btopenworld.com ([213.122.84.100] helo=main) by protactinium.btinternet.com with smtp (Exim 3.22 #8) id 188lCE-0007bx-00 for rsgb_lf_group@blacksheep.org; Mon, 04 Nov 2002 17:39:30 +0000 Message-ID: <000001c28429$123e6600$64547ad5@main> From: "Alan Melia" To: "LF-Group" Date: Mon, 4 Nov 2002 13:52:25 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: re DS2006 o/p Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=1.3 required=5.0tests=DATE_IN_PAST_03_06,SPAM_PHRASE_00_01,USER_AGENT_OEversion=2.42 X-Spam-Level: * Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Hi Hugh....Ahhh well if it has an SSB demodulator included you could presumably re adjust the local oscillator in this unit without affecting the measuring capability of the main unit. It will probably require some caps soldered in rather than a tweak, I suspect. You have to hope the local oscillator is not a crystal. I believe that the demod in the SPM-12 has two output 1kHz and 2kHz. The output of the SPM-3 is 1.5khz and this is the "IF" with the fixed filtering ( 100Hz BW ) which is an LC filter, and works quite well for reception. A narrower filter would require some kind of "locked" oscillator. As it is the unit will drift about the same order as the bandwidth (50 to 100Hz) over 12 hours or so (or mine does) Cheers de Alan G3NYK alan.melia@btinternet.com