Return-Path: Received: (qmail 20037 invoked from network); 30 Jan 2002 11:13:21 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 30 Jan 2002 11:13:21 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 10510 invoked from network); 30 Jan 2002 11:13:21 -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; 30 Jan 2002 11:13:21 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16VsZK-00050E-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 30 Jan 2002 11:06:22 +0000 Received: from imo-d06.mx.aol.com ([205.188.157.38]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16VsZJ-000509-00 for rsgb_lf_group@blacksheep.org; Wed, 30 Jan 2002 11:06:21 +0000 Received: from G0MRF@aol.com by imo-d06.mx.aol.com (mail_out_v31_r1.26.) id l.164.7f066ab (4459) for ; Wed, 30 Jan 2002 06:04:58 -0500 (EST) From: G0MRF@aol.com Message-ID: <164.7f066ab.29892d5a@aol.com> Date: Wed, 30 Jan 2002 06:04:58 EST Subject: LF: Ampliphase To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Mailer: AOL 6.0 for Windows UK sub 10510 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit In a message dated 1/29/02 6:03:20 PM GMT Standard Time, andre.kesteloot@ieee.org writes:


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



I remember it well.
Worked fine on land, and then someone put a 50kW ampliphase transmitter on a ship in the north sea. They saw some 'interesting' effects as the ship rolled and the distance from the mast to sea (together with the feed impedance) changed.

My antenna has also varied in impedance in a similar manner. Unfortunately, it never returned to an upright position without a great deal of effort.

73

David   G0MRF