List,

Wrote: I wonder how long it will be before the only remaining basket of will 
suffer a catastrophic fall.

The U.S. satellite system, AFAIK, is not guaranteed for high accuracy to 
civilians and also is vulnerable to foreign interference/destruction.

Perhaps while we have it as it is now, it might be prudent to accurately track 
the EFC voltage over time that one needs to maintain a particular oscillator to 
it maximum stability.

Then make an independent oscillator and divider chain that will cycle a digital 
potentiometer taps or perhaps a DAC to automatically maintain the rate-of - 
change needed to keep said oscillator at maximum stability.

Doing this now with at least one or two oscillators and then comparing to a GPS 
derived frequency and least gives one a “belt and suspender” back-up.

High quality 10 MHz oscillators are available all day on epay for less than 
$50.  Or one could splurge on  a HP 10811 or Rubidium for less than $100.

Just food for thought.

Regards,

Perrier





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