Hi all, 
wonder if anyone can help me out.
K3 audio frequency response in SSB or DATA mode has with flat EQ hughe
rolloff.
on the range 500-4000Hz there is 37dB roll off !

Bandwidth is set to 4KHz.
Any ideas to what might be the cause?
Measured with spectrum labs, 
screen dump is to be found here : 
https://www.dropbox.com/s/2nd7axi6ic2osd6/Schermafdruk%202015-12-22%2010.24.04.png?dl=0




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