Return-Path: Received: (qmail 15900 invoked from network); 10 Dec 2001 15:47:42 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 10 Dec 2001 15:47:42 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 2617 invoked from network); 10 Dec 2001 15:47:41 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 10 Dec 2001 15:47:41 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16DSaE-0000qY-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 10 Dec 2001 15:43:10 +0000 Received: from imo-r10.mx.aol.com ([152.163.225.106]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16DSaD-0000qS-00 for rsgb_lf_group@blacksheep.org; Mon, 10 Dec 2001 15:43:09 +0000 Received: from DL4YHF@aol.com by imo-r10.mx.aol.com (mail_out_v31_r1.9.) id l.6d.1edd6119 (4230) for ; Mon, 10 Dec 2001 10:42:21 -0500 (EST) From: DL4YHF@aol.com Message-ID: <6d.1edd6119.294631dd@aol.com> Date: Mon, 10 Dec 2001 10:42:21 EST Subject: Re: LF: W and G To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Mailer: AOL 6.0 for Windows DE sub 10504 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit Hi Mal,

if Alberto is right and the W&G 12 really has an IF output in the 10kHz range, it is indeed possible to do the last "demodulation step" completely by software.
In fact, you can use  Spectrum Lab to convert any frequency between 20 Hz and 22(24)kHz into anything you like (with sideband rejection), and filter the downconverted signal to any bandwidth you prefer (thanks to Jim, M0BMU who recently sent me an excellent design procedure for narrow band filters).

Spectrum Lab is currently undergoing "major surgery" to make it capable for stereo processing, so if it's not too urgent you should wait for the next version (V1.7).

73, Wolf DL4YHF.