On 7/12/07, Bill Coleman <[EMAIL PROTECTED]> 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
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