Return-Path: Received: (qmail 21201 invoked from network); 2 Dec 2002 18:35:03 -0000 Received: from netmail01.services.quay.plus.net (212.159.14.219) by mailstore with SMTP; 2 Dec 2002 18:35:03 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 14614 invoked by uid 10001); 2 Dec 2002 18:34:55 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by netmail01.services.quay.plus.net with SMTP; 2 Dec 2002 18:34:55 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18IvOh-0007tp-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 02 Dec 2002 18:34:23 +0000 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.10) id 18IvOg-0007tg-00 for rsgb_lf_group@blacksheep.org; Mon, 02 Dec 2002 18:34:22 +0000 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 18Iv72-0001Cb-00 for rsgb_lf_group@blacksheep.org; Mon, 02 Dec 2002 18:16:08 +0000 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 18Iv70-0001c6-00 for rsgb_lf_group@blacksheep.org; Mon, 02 Dec 2002 18:16:07 +0000 Message-ID: <5.1.0.14.0.20021202175331.027c0670@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Mon, 02 Dec 2002 18:14:28 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" In-reply-to: <3DEB8BAE.23C3BFFB@att.net> MIME-Version: 1.0 X-MailScanner: No Virus detected Subject: Re: LF: W-G SPM-19 trouble Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Status: No, hits=-0.2 required=5.0tests=DEAR_SOMEBODY,IN_REP_TO,SPAM_PHRASE_01_02version=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Dear Dex, There are only 2 frequency conversions in the SPM19 - one to the 40MHz first IF (which is what the 40-65MHz LO signal does), and the second to the 10kHz final IF. You could include a third conversion to get the demod audio out at 2kHz as I recall - but I don't think you could be using the audio output for level measurement because it has permanently-on AGC. So I guess the problem you have must lie in the 40MHz to 10kHz conversion oscillator I have the circuit diagrams for the SPM19, so I will take a look and can send the relevant diagrams if neccessary. BTW, when you say the frequency is wrong by 1.792kHz, how are you measuring this? is it high or low? One of the manuals also contains a list of error messages, but they usually are not very helpful - 100 ways to tell you it isn't working! Cheers, Jim Moritz 73 de M0BMU