Well, that’s very good news.  Unless I’ve missed it, this is first note I've 
seen that confirms predistortion corrections in the K4.

Grant NQ5T

> On Nov 4, 2019, at 10:58 AM, Wayne Burdick <[email protected]> wrote:
> 
> This is why the K4 (and a small number of other transceivers) include "active 
> predistortion" capability in hardware. It adapts the drive power to the 
> response curve of the PA stage. The K4 also has an TX sample input to include 
> an external amplifier in the correction loop. (The KPA1500 has a TX sample 
> output for this purpose.)
> 
> We expect to post numbers significantly better than the industry's typical 
> 3rd-order intermod performance at 100 W, which stands at about -30 dBc (ARRL 
> method).
> 
> 73,
> Wayne
> N6KR
> 
> 

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