Now for the problem I don't understand. I have been using the MFJ with an IC-7300 with an adapter cable. When I press the tune button for 1 second the 7300 puts out about 10 W carrier and the tuner does its thing. The result is usually close to 1.0 SWR. If I then transmit at full power (100 W) the SWR will show as high as 1.6 independent of modulation type. Am I doing something wrong? Retuning gives the same results. A few times when the SWR was higher than 1.6 at high power it would automatically retune. I don't know if the power folded back or not. The result would be nearly a match at high power. Adjusting the power down to 10 Watts would result in higher SWR.