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

[Bob Camp]

Hi

If you go through the math on your eeprom, there is a point at which writes “don’t matter”. It 
depends a bit on the part you have and your target life. One write every 24 hours is still under
10K writes in a reasonable lifespan for a GPSDO. It’s a rare eeprom that is rated that low. 

Bob

> On May 20, 2016, at 12:27 PM, Chris Albertson <albertson.chris at gmail.com> wrote:
> 
> 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).
>> 
>> 
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> 
> 
> 
> -- 
> 
> Chris Albertson
> Redondo Beach, California
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.