Return-Path: Received: (qmail 19478 invoked from network); 27 Jan 2002 16:35:06 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 27 Jan 2002 16:35:06 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 1412 invoked from network); 27 Jan 2002 16:35:07 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 27 Jan 2002 16:35:07 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16UsEf-0005SA-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 27 Jan 2002 16:32:53 +0000 Received: from imo-m05.mx.aol.com ([64.12.136.8]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16UsEe-0005S5-00 for rsgb_lf_group@blacksheep.org; Sun, 27 Jan 2002 16:32:52 +0000 Received: from DL4YHF@aol.com by imo-m05.mx.aol.com (mail_out_v31_r1.26.) id l.155.7e120f3 (4263) for ; Sun, 27 Jan 2002 11:31:55 -0500 (EST) From: DL4YHF@aol.com Message-ID: <155.7e120f3.2985857a@aol.com> Date: Sun, 27 Jan 2002 11:31:54 EST Subject: Re: LF: Jason Tests / PSK31 To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Mailer: AOL 6.0 for Windows XP DE sub 50 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit Hello Jim and David,

I have modified the PSK31 core in Spectrum Lab a bit so it can now produce an on/off keyed "audio carrier" with a few kHz which only needs to be rectified to have the raw phase keying information.

What I did not understand completely is how Jim produces the amplitude shaping. I think the PA supply voltage is variable, but where does the "envelope" signal come from ? One could (with a bit more programming work and more CPU power) deliver the "pulse shaping envelope" on the second channel of a stereo card.

73 Wolf  DL4YHF.