[ARC5] Taylor Super Modulation and Rothman Modulation

[Brooke Clarke]

Hi Henry:

Modulation System by Robert E. Taylor:
http://www.google.com/patents/about?id=ILlqAAAAEBAJ&dq=2282347
uses seperate circuits for positive and negative half cycles and claims 
to be efficient.

A simple way to get a higher level of AM modulation is to use negative 
cycle loading.  You make a circuit consisting of a resistor and diode in 
series.  The diode needs to have a breakdown voltage well above the peak 
plate voltage (including modulation peaks).  The circuit is connected 
between the modulation stage tube plate and ground with a polarity such 
that it clamps the negative going peaks.  This way when you approach 
over modulation (and normally get clipping of the negative half cycles)  
the loading reduces the negative going half cycles the allowing more 
modulation without clipping.  This was used by Art W6TYP (now a SK).

Have Fun,

Brooke Clarke, N6GCE
http://www.PRC68.com


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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