Return-Path: Received: (qmail 26182 invoked from network); 29 Jan 2002 18:02:25 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by exhibition.plus.net with SMTP; 29 Jan 2002 18:02:25 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 5363 invoked from network); 29 Jan 2002 18:02:17 -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; 29 Jan 2002 18:02:17 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16VcUa-0002zs-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 29 Jan 2002 17:56:24 +0000 Received: from out4.prserv.net ([32.97.166.34] helo=prserv.net) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16VcUZ-0002zn-00 for rsgb_lf_group@blacksheep.org; Tue, 29 Jan 2002 17:56:23 +0000 Received: from ieee.org (slip-32-102-142-17.md.us.prserv.net[32.102.142.17]) by prserv.net (out4) with SMTP id <200201291755252040355m00e>; Tue, 29 Jan 2002 17:55:26 +0000 Message-ID: <3C56E216.DD4AB3CC@ieee.org> Date: Tue, 29 Jan 2002 12:55:34 -0500 From: "Andre Kesteloot" X-Mailer: Mozilla 4.7 [en]C-CCK-MCD NSCPCD47 (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: PSK31 generation References: <5.1.0.14.0.20020128115929.00ab3b90@gemini.herts.ac.uk> <5.1.0.14.0.20020129144512.02f80bf0@gemini.herts.ac.uk> Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: James Moritz wrote: > if the drive to only one > of the totem poles was varied in phase, changing the output amplitude would > also change the output phase, introducing up to 90 degrees unwanted > additional phase modulation into the signal. interestingly, changing the phase to produce amplitude modulation was the approach RCA followed in the 1960's with their "ampliphase" AM medium-wave and short-wave transmitters 73 André N4ICK