[time-nuts] Lucent KS-24361, curious observation

Bob Camp kb8tq at n1k.org
Mon Dec 1 18:44:54 EST 2014

> On Dec 1, 2014, at 11:47 AM, Paul <tic-toc at bodosom.net> wrote:
> On Mon, Dec 1, 2014 at 11:15 AM, Graham <planophore at aei.ca> wrote:
>> It has been less than 18 hours since I powered them up so I am not yet
>> wondering why the the REF-0 LED's are in the state they are as I have seen
>> reports of others having to wait 24 hours or so before every "locks in".
> There are differing states.  My pair went OK+Standby in about 10 minutes
> but they're not "stable" at that point.
> Here's a log snippet:
> Log 019:20141128.00:00:00:  Power on
> Log 020:20141128.00:00:26:  Power settings ok, Int: 17 dBm, Ext: 17 dBm
> Log 021:20141128.00:52:21:  Position hold mode started
> Log 022:20141128.01:28:32:  GPS reference valid at 20141128.20:34:00
> Log 023:20141128.20:35:04:  Locked mode entered
> Log 024:20141129.10:35:03:  Ready for 4 hour flywheel
> Log 025:20141129.16:35:03:  Ready for 8 hour flywheel

Checking the log from time to time is a very good idea.
> The first timestamp after power-on is 00:00 of the last valid date prior to
> power-off.

Until it gets GPS lock, the time stamps can be pretty confusing. 

>  I assume the deltas are correct.  So 1:29 to Locked and 20 more
> hours to "stable".  Holdover uncertainty continues to decrease for many
> more hours.  It decreased from hundreds of microseconds to 3 at the time of
> that log and is now at  900 nanoseconds.

The holdover uncertainty numbers on these are every bit as “interesting” as the numbers the Z3801 puts out. Fun to watch. I would not count on them being correct. 


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