[Elecraft] [K3] Width Control and AF Output Level

[Lyle Johnson]

Check if IIR or FIR filtering is selected for the narrowest bands.

Also note that the receiver equalizer is not used in the 50 Hz and 100 
Hz widths, so if the radio is set up for a boost at the selected pitch 
frequency, the amplitude will drop.  Be sure the receiver equalizer is 
set to o in the frequencies that include the desired pitch.

Please see the manual for details on how to check and do these if you 
are uncertain.

73,

Lyle KK7P

> ...AF output level with 100Hz passband width is lower than with 150Hz passband width. He also reported that a noise like “Ptsu” was generated on reducing passband width from 150Hz to 100Hz. He had guessed that these were specific to his K3, but some other K3 users including myself reported the same.
> Some extreme users who use this narrow passband may have been bothered by this reduced AF output level and noise...