MFJ-993b tuning problem

Discussion in 'Radio Circuits, Repair & Performance' started by W5PZT, Mar 21, 2020.

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  1. W5PZT

    W5PZT Ham Member QRZ Page

    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.
  2. VE1IC

    VE1IC Ham Member QRZ Page

    See what the results are if you tune into a dummy load? Maybe try a different antenna.

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