[Elecraft] KX3 APF

[F5LCI]

While the narrowest XFIL is very good, I need sometimes to use the APF to
listen to 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. to get the best decodable CW signal. 
e.g.: 
XFIL BW 0.05, FC * 0.53 (all filters adjustments already done) 
APF : better signal at APF 0.51,  instead of  APF*0.53 (where I almost loose
a faint sig). 
Tested on WWH, the FLDIGI audio spectrum visually confirms this difference. 

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

/"To nobody, except those who will take pleasure here" (Franz Schubert,
1797-1828)/



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