Again, my statement is that keeping good time is not difficult.
A good NTP client will do that.
Yes, I do realize that if your clock is 20 milliseconds fast, and the
other guy is 20 milliseconds slow, the total error is 40 milliseconds.
The documentation at
<http://physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main-1.7.0.html#SYSREQ>
does say plus or minus 1 second.
It then goes on to recommend a couple of good NTP clients (which have
been mentioned here) that will do several orders of magnitude better
than that.
73 -- Lynn
On 9/13/2017 2:40 PM, Jim Brown wrote:
Lynn,
You can argue all you like, but those with long experience with WSJT
modes try to keep their clock within a few tens of msec of correct time.
Why? Because the other station can be off in the other direction, and
what counts is the DIFFERENCE between you and the station you're trying
to work. And the greater that difference, the less likely that you will
decode each other, especially under weak signal conditions. Why? Because
the noise reduction schemes for JT65, JT9, and FT8 are synchronized to
the beginning of the transmission period, and the decoding station needs
to lock onto the sending station.
Time sync is LESS critical for modes like MSK144 and ISCAT, which are
primarily used for meteor scatter, decode from short bursts of signal,
and do not depend on sync for their decoding.
73, Jim K9YC
On 9/13/2017 1:38 PM, Lynn W. Taylor, WB6UUT wrote:
Plus or minus 500 msec. isn't a big deal. It's big enough that I'd
argue that it's essentially the same.
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