Posted by
Geoffrey Mackenzie-Kennedy on
May 12, 2011; 4:44pm
URL: http://elecraft.85.s1.nabble.com/KPA-500-Output-for-Input-schedule-tp6352735p6356429.html
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.
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