[Elecraft] K3 related - non-linear audio transformer behavior

[Jim Brown]

On Sun, 21 Sep 2008 20:42:27 -0400, Joe Subich, W4TV wrote:

>I think is it safe to treat the audio as band limited 

That's like saying a driver is slow. How slow? Bandwidth limiting 
CHANGES the complex impulse response of the system. It does not make 
it not matter, or benign, just DIFFERENT. And the bandlimiting is 
quite variable, thanks to the design and implementation of K3 
operating controls of the DSP. Also, note that the impulse response 
is complex -- that is, if we looked at it as a frequency response it 
would have a phase response too. One of the important and complex 
problems that Lyle has to solve (and he's solved it pretty well if 
he doesn't hit the transformers, according to my ears) is a nice 
phase (time) response. 

Jim K9YC