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