[time-nuts] 60hz disciplined watch follow up

[Hal Murray]

> My estimate of the citizen ecodrives automatic rate adjustment occures at 10 day intervals.

That only works if you can track the signal continuously.

Suppose you lose the signal for a while.  How many cycles was that?  If it's 
only a short while and your clock is stable enough, you can assume you will 
come back on the right cycle and only be off a bit on the phase.  Your clock 
stability determines how long a "short" while is.

Now consider that your watch will be out of contact for 8 hours while you 
sleep.  If it was accurate to 1 cycle in 8 hours, you wouldn't need to go 
through this much effort to calibrate it.


This is similar to the problem of RS-232 clock accuracy.  The receiver needs 
to be able to determine the difference between N and N+1 identical bits.

-- 
These are my opinions, not necessarily my employer's.  I hate spam.