2020-12-06, 09:13:44
Doug,
Concerning your rig not remembering it's previous tuning settings, this may not be all that out of the ordinary after all, especially if you are trying to tune a higher frequency after being on a previously tuned 'lower' frequency. In my case, I have an MFJ-998RT remote tuner that used to sit at the base of my 43' ZeroFive Antennas and exhibited the same characteristics. The only work-around was to power the tuner off and back on.
I have noticed this can occur if the tuning solution for the previous band results in a very high SWR on the new band, and more often happens when going from a lower frequency band to a higher frequency band especially when using a highly reactive antenna. This very high SWR can reflect all input power from your transceiver, so the autotuner cannot sense enough RF input power. The solution was to simply cycle the power to the autotuner when changing bands. This drops the autotuner to bypass prior to tuning so some forward power is sensed and subsequently permits a tune to occur.
I am not using my autotuner at the moment but I wonder if the same thing (in theory) is happening to you? You wouldn't have to power down in your case but you would have to force an auto tune by holding the tune button in on the 7300.
Concerning your rig not remembering it's previous tuning settings, this may not be all that out of the ordinary after all, especially if you are trying to tune a higher frequency after being on a previously tuned 'lower' frequency. In my case, I have an MFJ-998RT remote tuner that used to sit at the base of my 43' ZeroFive Antennas and exhibited the same characteristics. The only work-around was to power the tuner off and back on.
I have noticed this can occur if the tuning solution for the previous band results in a very high SWR on the new band, and more often happens when going from a lower frequency band to a higher frequency band especially when using a highly reactive antenna. This very high SWR can reflect all input power from your transceiver, so the autotuner cannot sense enough RF input power. The solution was to simply cycle the power to the autotuner when changing bands. This drops the autotuner to bypass prior to tuning so some forward power is sensed and subsequently permits a tune to occur.
I am not using my autotuner at the moment but I wonder if the same thing (in theory) is happening to you? You wouldn't have to power down in your case but you would have to force an auto tune by holding the tune button in on the 7300.