[time-nuts] Z3801A Frequency Jump

[Brian Kirby]

I came home and checked my timing system and seen where one of my Z3801A 
GPSDO had a frequency jump.

Attached is a PDF file with two drawings.  The first drawing is a screen 
dump from GPS Con, the Z3801A controller program.  Note is shows a 500 
some units jump in EFC and phase jump of -274 nanoseconds.

The second drawing is a chart from Excel.  The Z3801A 1 PPS was being 
compared against a HP5065A rubidium and this data is the 100 second 
averages record by TAC32.  Note is shows a 200 nS jump too.  The scale 
of the plot is in microseconds (I run a 10 uS offset for some long term 
drift experiments).

I cannot remember what causes this from past discussions - it may be an 
oven regulator....

Brian - KD4FM
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