Specification is 13.48 sec TX, 16.52 sec RX, 45% Duty Cycle.

Source: http://qrznow.com/new-digital-mode-from-k1jt-ft8/

73, Dennis NJ6G

On 2/14/2018 17:07, Tom-KQ5S wrote:
I believe FT8 is 13 sec TX, 2 sec decode and then 15 sec RX for a total of
17 sec non-TX so you have 13 sec TX and 17 sec RX.  Much less than 50%.

Tom - KQ5S

On Wed, Feb 14, 2018 at 6:51 PM, Jim Brown <j...@audiosystemsgroup.com>

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

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