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

[Jack Smith]

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:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>