It doesn't have to be perfect. When I am operating FT8 in my truck (parked), I am often up to 3 seconds off and still get some decodes.

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Yeah, I'm pretty sure FT8 sends all the info multiple times in the 15s interval and FT4 is the exact same encoding with fewer repeats.

Wow. Not me. Anything over a half a second, I never get decodes on ft8.

Unless that's js8call, not sure....