KX1 Antenna Tuner?

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KX1 Antenna Tuner?

I just finished my KX1 and ATU, Yeah!

In tuning the ATU for a null I get about .4 mV (there are two nulls), at both nulls the power reads 2.2 watts.

If I look at the RF out on my scope I see a peak to peak reading of 18.8 volts into a 50 ohm dummy load.  I compute power to be 3.24 watts.  (Vpp/sqr 2)^2/50ohms, P=Vrms^2/50.  I'm feeding the KX1 with 13.8 volts.

Does anyone have any suggestions where I might poke around with my scope to see why I'm not getting 4 watts?