On 23/07/2017 07:48, Mark Turner via wsjt-devel wrote:
± 1.5s shouldn't present a problem to anyone, even, just about, for
people (e.g. some dxp) that rely on crude GPS NMEA serial data time
synchronisation.
In the (unlikely?) event that an even shorter DT window is ever
considered, I'd like to request that a small range of DT adjustment be
made available - similar, but perhaps of a smaller magnitude/finer
resolution, to JT65's Dsec setting in WSJT10 (not available in
WSJT-X?). Other than using NMEA data, another scenario where *really*
tight timing requirements will cause a problem is in the use of remote
radios where the client software is running at the remote, not the
radio end; obviously there's an inherent, known, and fixed delay in
such a system that can be of the order of 100's of ms.
Regards, Mark
Hi Mark,
all understood. It is clear that FT8 with 15s T/R periods and very short
inter-message gaps has reached the limit of both human response time and
reduced sensitivity that would be acceptable for weak signal amateur
radio operation. I suspect that tighter time synchronization
requirements will not be expected. Everything works against the human
speed operator as the limits of timing are approached, clearly the
computer can do much better if it only has mundane algorithmic work to
do but at some point this has to be about the human getting enjoyment
from a hobby!
Achieving +/- 1.5 second clock accuracy is possible with simple aural
comparison and manual update from an on-air time source if necessary.
The real problem is the appalling time inaccuracy of PC systems unless
they are helped by on line time servers, even worse because Microsoft
fell that a time update is only necessary once per few days.
73
Bill
G4WJS.
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