[Elecraft] K3: elaborate on the DSP at AF

[lyle johnson]

> I have noted TONS of references to "DSP" on the FAQ but all of them
> appear to apply to the DSP at IF.
> 
> What does the DSP at AF do (capability)?

The K3 DSP accepts input at IF.  It performs functions at both IF and AF. 
 Bandpass filters, for example, operate at IF and at AF.  It would be tedious 
to list which functions occur at IF and which at AF, and some may change with 
future firmweare releases.

73,

Lyle KK7P