FT8 app on X6100 can start transmit with not more than 1 (or 1.5) seconds after 15 seconds time slot started otherwise generating and transmitting message might exceed slot.
Also FT8 decoding support "incremental" decoding - some strong stations messages might be decoded 1-2 seconds before ending time slot. In theory - you have about 2-3 seconds to select CQ station and press MFK to start calling it without 2-slots delay. Otherwise app will wait for the next time slot, when chosen station will listen (30 seconds).
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Georgy // R2RFE
