[time-nuts] GPS phase lock !!
dansawyer at earthlink.net
Fri Mar 6 04:51:18 UTC 2009
I am new to time-nuts, and have just successfully phase locked a Jupiter
GPS 10kc signal to a 10 mhz vcxo. There is jitter in the 10kc Jupiter
output, as expected. How can the characteristics of the 10 mhz vxco
signal be measured or analysed? A 10 mhz signal from a tcxo shows a
clean sync with the locked 10 mhz signal, however there is low frequency
'jitter' between the two signals. The 10 mhz signal gains and looses
over about a 40 nsec range on a random 20 to 40 second cycle.
What is the root cause of this low frequency oscillation? Is it the
result of the phase lock 'searching'? Or is it inherent in the 10mhz
Thanks in advance - Dan
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