[Elecraft] Tutorial about Filters and AGC

[Paul Christensen]

> Now, let's look at the AGC. I haven't taken the time to study design 
> details
> of the K3's AGC, but from what Wayne and Lyle have posted here, I think I
> understand that there are two AGC functions,..."

And that, I believe is the root issue on the matter.

(1) What is the passband of the hardware AGC, and what is its dependency 
(i.e., filter selection); and
(2) What is the passband of the DSP AGC, and what is its dependency (i.e., 
filter selection).

Looking at the K3 block diagram, it appears the DSP is fed back to the IF 
amp -- meaning that the hardware and software form a loop and hardware and 
DSP AGC are not independent (although a portion of the DSP could still be 
independent and not shown on the diagram)

Concerning DSP in either the hardware AGC loop and/or the DSP AGC loop, is 
the passband of either loop variable as a function of the DSP bandwidth 
setting?  Or, is the DSP AGC passband fixed, irrespective of the DSP filter 
setting?

My apologies if this has been covered in prior messages, but I have not yet 
been able to extract the answers to these questions.  Tnx!

Paul, W9AC