The INTERESTING thing about the article is that it is ANALOG predistortion. Even a few dB would be an improvement, if 10 to 20 dB proves beyond reach for such a broad (16:1) spectrum as HF.
Cortland KA5S ____________________________________________________________________________ ________________ Date: Thu, 12 May 2011 13:43:51 -0400 From: Jack Smith <[email protected]> Subject: Re: [Elecraft] KPA-500 "Output for Input" schedule? To: [email protected] Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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_sign als.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 > > ______________________________________________________________ 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
