LF: Ampliphase

[G0MRF@aol.com]

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