[Elecraft] K3 s/n 1693

[Lyle Johnson]

> I have found something in the operation of the digital bandpass filters 
> I don't quite understand and hope someone will be able to set me 
> straight...
> 
> Can anyone explain what might be happening?

Yes.

I suspect you are using the Rx Equalizer and have it set to boost your 
desired pitch.  If so, please set it to 0 at your desired pitch.  If you 
need shaping of the overall audio response, consider cutting the 
frequencies you don;t want rather than boosting those that you do.

The DSP switches to a different filter implementation at 50 Hz and 100 
Hz widths versus 150 Hz and wider.  This is the reason for the slight 
"pop" or "tick" that you may hear.  This also depends to some extent on 
the signal strength of the signal(s) or noise present at the time the 
switch is made.

73,

Lyle KK7P