I'm pulling my hair out on this one, but let me keep it real simple. This
is on a K3s and all hardware/firmware is latest/greatest.
Filter: 6KHz
Mode: USB
BW: 4.00KHz
My question is this:
*Why does the audio passband dramatically roll off in the lower frequencies
as my Shift/FC goes above 1.40Khz? *
I would think that there wouldn't be any bass rolloff until FC was above
2.0KHz (i.e., half of 4KHz BW). Instead, what I'm observing is:
- with FC of 1.6KHz, I see -8dB at 100Hz
- with FC of 1.8KHz, I see -15dB at 100Hz
I'm using Line Out to soundcard and Visual Analyser 2014 software. It
mirrors what I hear in my headphones.
73, Barry N1EU
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