[time-nuts] Home made GPS disciplined atomic clock

[EWKehren at aol.com]

I think it is a bad idea except if holdover due to loss of GPS is an issue.  
For all practical purposes disciplined oscillators make rubidium obsolete  
because the majority use lower performance cheaper oscillators in their systems.  
Looking at Corby Dawson's data on oscillators and HP 5065 shows that it does  
outperform even the best oscillators but there is no comparison between a HP  
5065 and what is on the market today. Look at the specs of Rubidium standards 
 and look at their 100 sec. data. If you want improvement take the output of 
a  Thunderbolt and lock it to something like a FTS 1000, 1200 or 2000 
adjusting the  loop constant to the specification of the external oscillator. As an 
example the  100 sec.spec on the FE 5600 is 4 X -12 versus 1 X-12 on the FTS 
series  oscillators. And I consider the FE 5600 one of the better Rubidium's! I 
have not  personally characterized Thunderbolt and Rubidium oscillators but I 
doubt that  there is very much difference in performance.
Bert   WB5MZJ
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