[hpsdr] Pre-Distortion

[Warren C. Pratt]

Hi Dan,

It's an interesting idea.  For just pre-distortion, there's no reason to 
do so as all the required amplitude and phase information can be 
extracted from the single feedback signal.  Perhaps others will have 
comments.

73,
Warren  NR0V

On 12/8/2013 6:39 AM, Dan Mills wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Silly question, but would it be worthwhile to modify the sampler to
> give both current and voltage sample outputs?
> That way folks with a dual adc rx can use it to measure the impedance
> seen at the point the sampler is inserted and things like gamma, RL
> and SWR can be trivially calculated.
>
> It would even allow for some tricks like say making the PA drain
> voltage track the value of |Z| so that the amplifier always operates
> at a drain voltage corresponding to full power into the actual load
> impedance presented. Making the drain voltage track the modulation
> envelope is harder but also offers worthwhile efficiency improvements.
>
>
> Just a thought.
>
> 73 M0HCN.
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