[Elecraft] SS30DV feedback OT

[Ignacy]

With bias, 12V transistors are class B or AB, not C. 

See http://flarc.net/eme-info/PDF/N1JEZ-2.pdf. 

He describes an amp changed to Class B (very low bias for little heating).
Regular IMD3 -22db. After predistortion -55db. Plus extra db in additional
power power. All for a cost of feedback + some programming. 

With predistortion we can get more power (drive closer to saturation) with
less heating (higher efficiency and lower quiescent current) and less IMD.
All for a cost of hardware feedback + programming.  

I am all for 50V (or higher) for high power amps. 


Ignacy, NO9E



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