[Elecraft] [K3] K3 NR

[Bill W4ZV]

Brett Howard wrote:
> 
> As far as the shift you're mentioning are you talking about the fact
> that the FC star moves to the freq that you have pitch configured for?
>  The filter is still centered in the IF land but it looks like a shift
> because the K3 tells you about its filters in AF terms.
> 

No.  At low pitches, the MCU shifts the IF filter such that the lower side
is never lower than ~200 Hz.  If you're using a 500 Hz XFIL and PITCH 300,
the XFIL passband is actually 200-700 Hz...not 300 +/-250 (i.e. not 50-550
which would be centered).  Even though you see FC*.30 for the DSP filter,
the IF filter is actually offset.

73,  Bill

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