[time-nuts] FE-5680A GPS discipline board on sale now

Chris Albertson albertson.chris at gmail.com
Fri May 20 16:27:45 UTC 2016


Rather then a manual button, you might always burn in the EFC value
after finding it stable for some number of hours.  Then after that
only burn it again under some strict conditions like being stable for
twice as many hours and the value in the EEPROM is different from what
it needs to be, eventually getting to updates every week or two if
needed.  Actually that is my use of the Rb oscillator a portable
reference

> Another use case for this GPS discipline module is to use it to figure out the correct tuning value for a particular oscillator, then unplug it and use the DOS software to commit that value to EEPROM (multiplying the logged value by 4 to make up for the resolution reduction). Having done that, you now have a portable calibrated reference. From what I can tell the holdover performance of the 5680A is particularly good - exactly why they made them, in fact. If I had just one more input on the controller, I might have added a “commit” button that would send the EEPROM burn command on demand with the current EFC value (the controller is almost out of flash space, though, so that’s an issue).
>
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-- 

Chris Albertson
Redondo Beach, California



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