[time-nuts] Holdover: Z3801A vs KS-24361

Hal Murray hmurray at megapathdsl.net
Sun Apr 15 06:59:49 EDT 2018


kb8tq at n1k.org said:
>> A  KS-24361 says:
>>  Predict  394.1 us/initial 24 hrs
> That would suggest the unit is unlocked. It should be below 10 us. Just as
> with the 3801, the estimate is a bit fuzzy. You should be able to see issues
> in the data on the Z3809/Z3810. 

It says it is locked and has been locked for days.
  >> Locked to GPS      TFOM     3      FFOM     0

I used this as a learning exercise for my new TICC.  Something is clearly 
fishy.

The reference for the TICC is the crystal in a HP 5334B with the good-crystal 
option.  It's not calibrated, but there isn't any GPS logic to jerk it 
around.  I assume the swing is due to temperature.  I corrected the slope of 
the graph by hand.

Here is a day+ of data:
  http://users.megapathdsl.net/~hmurray/time-nuts/TICC/TICC-KS.png

Here is a zoomed in chunk:
  http://users.megapathdsl.net/~hmurray/time-nuts/TICC/TICC-KS-2.png


-- 
These are my opinions.  I hate spam.






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