[Elecraft] K3 TX equalizer messes up PSK

[Alexandr Kobranov]

Just short answer for
> maybe you could briefly explain why WSJT would benefit from 
> other than flat eq?
When using some soundcards (it was probably some SoundBlaster not so 
bad but not the best one) I used TX EQ for power conformity in all 
used tones. Do not remember exactly now but output power vary by some 
dB´s. It was possible to compensate power levels to one value by 
playing with TX EQ (as frq of EQ are not just as WSJT tones are it was 
really playing :-)).
Maybe there is also some influence of TX filter ripple etc. but no 
serious measurements were done - simply output Power was aligned by EQ.
This is the story, maybe somebody else has more experience and 
details/masurements.
I am also not sure what is done with phase of signal when EQ is in 
action - this can be critical, I suppose. (but my sigs were decoded so 
not destroyed by phase error in my case).

73!
L. -dst-