Try setting mic gain to 0, then increasing it slowly to get to the 4 or 5 bars of ALC. If for some reason the JT Tx signals are significantly higher in amplitude than the PSK31 Tx signals coming from the PC, the ALC in the KX3 may be overcompensating. The workaround at present is to have too little gain and increase it, rather than depending on the Mic ALC to perform large amounts of compensation.

Hope this helps,

73,

Lyle KK7P

Here might be a hint, but not sure..

http://g0mgx.blogspot.com/2013/07/jt-what-ah-jt9.html?m=1

w7wo ..


Hi...Regarding WSJT-X JT-65 and JT-9 modulation of ssb with power set to 2 
watts.

The Audio is clear and the tone is pure.  I cannot get ALC to hold at 4 or 5 
bars.  It blinks and then drops out.  I am using a dummy load for the antenna 
and MacBook Pro for audio.  Direct connect with Elecraft cables.  Changing 
nothing in the setup and switching to fldigi PSK31 works FB.  I am perplexed.  
It seems like the narrow audio of the JT sigs won't modulate the KX3.  Anybody 
else doing this exercise or am I messing with the bleeding edge?

I have tried the obviuos input levels and KX3 mic GAIN.  Tried with power set 
from 0 to 5 watts.  It truly feels like the JT tone is causing some kind of 
interaction with ALC control..

Thanks,
73 de Bob w7wo
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