That is a question for the designers, but it clearly adjusts much, much more 
slowly than amplitude modulation frequencies (to avoid distortion).

This is a closed loop power control, like commercial transmitters. Most amateur 
transmitters are fixed gain, so this is a surprise for nearly every new 
Elecraft owner. 

wunder
K6WRU
CM87wj
http://observer.wunderwood.org/

On Mar 2, 2015, at 8:08 AM, John Huggins, kx4o <[email protected]> wrote:

> Thanks Walter.  I think I understand now.
> 
> What is the loop bandwidth of the power control loop?
> 
> Thanks.
> John, kx4o
> 
> On Mon, March 2, 2015 05:54, Walter Underwood wrote:
>> No. Most likely the power varied as it was hunting for the right level.
>> It probably started low then increased power slowly throughout each
>> transmission.
>> 
>> wunder Walter Underwood
>> [email protected] http://observer.wunderwood.org/  (my blog)
>> 
>> On Mar 1, 2015, at 9:44 PM, John <[email protected]> wrote:
>> 
>>> Is it safe to say my very low input audio level was compensated by the
>>> KX3's power control loop to yield 5 watts out (the actual radio power
>>> setting)?
> 
> 
> 

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