Most 9:1 designs are UNUNs - unbalanced to unbalanced. For feeding a window 
line fed doublet, you definitely want a BALUN - balanced to unbalanced. The 
doublet / window line is a balanced system. The output connector on the KX2 is 
unbalanced. 

If you are using an UNUN in this setup you you may be getting RF on the KX2 
case which, when you touch it, may cause the tuner to do what you are seeing. 

The Elecraft BL2 is a great solution for this application since you can choose 
either 1:1 or 4:1 to see which one makes the ATU the happiest. Or you can roll 
your own but it needs to be a BALUN. 

GL & 73,
Brian, K0DTJ
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