The amplitude appears fairly consistent. I think a simple low pass filter
is
all that is needed and a cut off of maybe 7 kHz would be appropriate.
Maybe
even lower as this 4kHz ESSB plot with the FM filter shows, the audio
response is limited above 2.5kHz.
Mike:
You may want to revisit that last measurement. My measured data closely
mirrors that shown on N1EU's website with the 6 kHz filter engaged:
http://n1eu.com/K3/K3_notes.htm
See chart entitled " Elecraft K3 SSB Receive Passband..."
Paul, W9AC
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