[Boatanchors] [ARC5] Taylor Super Modulation and Rothman Modulation

[mac]

Rothman modulation is/was one of several carrier control, screen grid  
modulation schemes.  Some wild claims made for it as I remember but,  
in actual fact, nothing particularly remarkable about it.

Taylor "Supermodulation" was a scheme for using a pair of grid  
modulated tubes coupled together in a novel way so as to achieve  
results equivalent to high level plate modulation but without the high  
powered audio components.  Besides the obvious savings in component  
costs and power efficiencies Taylor also made such (wild) claims as a  
greater ratio of sideband to carrier power and reduced bandwidths  
comparable to those achieved by SSB systems.  For the definitive  
analysis and critique of the Taylor system and it's claimed benefits  
see QST, December 1950, page 33 "Supermodulation" - An Evaluation and  
Explanation by Oswald G. Villard, Jr.  W6QYT.  Villard, BTW, was a  
professor in the Stanford University Electrical Engineering Department.

Other articles:
Radio News, Sept. 1948, June 1949, Feb. 1950, May 1950 & July 1950.
Also,  U. S.  Patent #2,282, 347
Other stuff in CQ and Electric Radio as well.

Dennis D. W7QHO
Glendale, CA

****************

On Feb 2, 2011, at 11:48 AM, Henry Mei'l's wrote:

> These are the modulation methods I was thinking of.
> I understand there were articles in CQ, 1951 or thereabouts; also
> articles in QST. I know super modulation is not permitted in some  
> (most/all?)
> countries for amateur use.
> Seems quite interesting. I'd like to experiment with the circuits.
> Does anyone have any experience with them - or the actual articles?
>
> Henry, Cph.
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