Finally completed the power watchdog timer for the K2. This allows me to operate the K2 remotely within compliance of the requirement to have an automated means of shutting down a transmitter if it exceeds 3 minutes on the air. This is an FCC requirement, and you definitely need to be concerned about the possibility of losing rig control during a transmission.

My approach is the use an Arduino board to monitor the PTT line from the K2. If that is active longer than the predetermined timeout period (FCC mandates not more than 3 minutes), it disconnects power to the rig.  I have the power disconnected for a minute, then restored. The K2 will not power-up in a transmit state, so the problem should be resolved.

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