[Elecraft] KPA-500 "Output for Input" schedule?

[Geoffrey Mackenzie-Kennedy]

Hello Guy,

The short answer to the first part of your question is yes, and the generic 
term for such a scheme is Predistortion. A term that has been used to 
identify a Predistortion scheme which employ digital techniques is a 
"Digital Predistortion Linearizer" (DPL), and its use can bring about a 
significant reduction in the level of IMD being transmitted compared to a 
classic class AB design. Unfortunately the relevant data that I have is 
packed ready to leave for Luxembourg.

I don't know how easy or difficult DPL would be to implement in the K3, or 
in any other "already designed" rig which employs DSP, but I suspect that 
somebody else reading this could tell you.

73,
Geoff
GM4ESD



On Thursday, May 12, 2011 at 4:15 PM, Guy Olinger K2AV wrote:

> I would like to know if some kind of feedback (maybe complicated)
> could bring about a quantum leap in linearity, like sampling the
> output of the amp and feeding that back to the K3 to digitally
> pre-alter the audio to cancel the distortion going out.