Maximum power output on K2 in digital modes

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Maximum power output on K2 in digital modes

Bob Towers-3
I see that the advised maximum is 5 watts for RTTY.  Is it possible to run up to 10W for:

a) contest RTTY where the average QSO length is less than a minute?
b) lower duty modes eg PSK31, MFSK and Olivia?

What limits the power, anyway? Is it cooling or the rating of the output transistors?

73

Bob
2M0KDZ

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