My preference would be that instead of shutting the power off a high SWR would switch to the Tune power, then when the SWR improves the power is restored (ideally after a delay).? This avoids the need to do something other than using the tuner to get a low SWR while still keeping the QMX safe.
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This may be a bit more work but would make operating using a tuner much easier.
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Chris, G5CTH