[Elecraft] K3: honest question re Audio Peak Filter

[Barry N1EU]

As far as I can see, Lyle's dsp firmware is creating the AF response
dynamically from the IF - it's just a matter of Lyle shoehorning APF code. 

I'd guess that one reason LPF was implemented in hardware rather than
firmware is to filter out noise that was generated either at the DAC or
post-DAC.

73/HNY,
Barry N1EU

 

Julian, G4ILO wrote:
> 
> This is all very interesting, but I seem to recall a post a few days ago
> by Lyle stating that the K3 RX EQ was applied by additional shaping of the
> IF response, and there is no programmable filtering at AF in the K3. That
> is the reason for the LPF board.
> 
> So surely this is one wish that can only be fulfilled using an external
> box, unless Elecraft finds a way to shoehorn a new APF board into the K3?
> 

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