[Elecraft] KX3 APF

[F5LCI]

While the narrowest XFIL is *very* good, I need sometimes to use the APF to
hear small signals.
There is a discrepancy between their center frequencies. It could be
considered as small, but it becomes annoying with XFIL on BW 0.05 :
sometimes I have to shift the APF freq. regarding to XFIL*0.53 to get the
best signal. e.g.:
XFIL BW 0.05, FC * 0.53 (all filters adjustments already done)
APF : better signal at APF 0.51 instead of 0.51 instead of  APF*0.53 (where
I almost loose a faint sig).
Tested on WWH, FLDIGI audio spectrum shows this difference.

No info after RTFM again.
Is this 4% difference, however audible, within the specs ?
Am I anal ? 
If not what can I do ?
72, 
Jean-Marc, FO/F5LCI




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