[Elecraft] KAT500/KPA500 - Sanity Check Please

[Andy Durbin]

"The ATU does interrupt the amp key line when the bypass SWR is too high AND there is enough forward power to endanger ATU components. It’s a fault."


Dick,

I'd like to understand that a bit better.  Are you saying that, with a tuning solution that gives 1.6:1, and with that tuning solution being active, that the bypass SWR is being used in the logic that controls the interrupt line?

I would not have expected the bypass SWR to be used in this condition. With the tuner in-line isn't  the instantaneous SWR and reflected power what controls the interrupt?

In other words - isn't the bypass SWR only a factor if/when the tuner is bypassed?

Thanks and 73,
Andy, k3wyc