[Elecraft] Time Syncronization

[Lynn W. Taylor, WB6UUT]

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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