Geoff & list readers ... There's an article in the current Electronics Design News, as a matter of fact, on pre-distortion.
http://www.edn.com/article/518070-RF_predistortion_straightens_out_your_signals.php Although aimed at cellular radio digital modulation, the concepts apply to analog SSB as well. Jack On 5/12/2011 12:44 PM, Geoffrey Mackenzie-Kennedy wrote: > 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. > > > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
