And even this is conservative -- JT65 is 48 sec TX and 72 sec RX, so 40% duty cycle. FT8 and MSK144 have equal TX and RX times, so 50% duty cycle. The TX period for MSK144 can be varied from 5-30 sec, but TX and RX times are always equal.

73, Jim K9YC

On 2/14/2018 3:25 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
Yes, the amp can run indefinitely on 50 Mhz with 50 sec key down TX at continuous 1500W carrier followed by 50 sec in RX. We specifically were looking at 100% carrier modes like JT65 etc. when we conservatively specified this.

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