[Elecraft] Solid State Amps

[michael taylor]

On 7/12/07, Bill Coleman <aa4lr at arrl.net> wrote:
>
> > Now most radios provide 100 watts output using transistors and the
> > tube finals in rigs have long been gone.  So, is this just a
> > natural evolution of amplifiers or is some new technological
> > breakthrough happened in high powered solid state amplifiers?
>
> Looks like just the continuing evolution of electronics.

Some of it is an evolution of higher class of amplifier operation,
such as Class-E or F or I guess a hybrid of E and F amplifiers for
higher efficiencies, when suitable for non-linear operation (CW,
some/all? digital modes).

7-MHz, 1.1-kW Demonstration of the New E/F2,odd Switching Amplifier Class
<http://www.its.caltech.edu/%7Emmic/reshpubindex/scott.html>

E. Lau, K. Chu, J. Qin, J. Davis, K. Potter, D. B. Rutledge,
"High-Efficiency Class-E Power Amplifier ," QST May & June, 1997.
<http://www.its.caltech.edu/%7Emmic/reshpubindex/poweramp.htm>

-Michael, VE3TIX