On 10/08/2017 00:22, Richard Lamont wrote:
In a perfect station, exactly how soon after the beginning of the
15-second (or whatever) window should the Tx start to radiate RF? Is a
nominal amount of delay baked into the protocol(s) to allow for T/R
switching, the default 0.2s before audio etc?

Hi Richard,

it depends on the mode. Fast modes start as soon as PTT is asserted and "Tx Delay" has expired. Slow modes apart from FT8 start audio at the later of 1s or PTT asserted plus "Tx Delay". FT8 audio starts after the later of 0.5s or PTT asserted plus "Tx Delay".

With the slow modes the start time does not impact the timing of the symbols transmitted, so a late start does not increase the DT seen at a receiving station, it truncates the front symbols of the message (sort of analogous to stopping early).


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