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

[paul swed]

Hello to the group.
I would like to add a comment to this thread. I agree with Bobs comment on
the eeprom writes. For modern units its 100K plus but does depend on the
memory cell technology.
However aren't the 5680s about 10 years old? If thats true then the write
life cycle was much lower back then and I would be careful.

So far on the thread we are discussing manual writes that most likely are
occasional.

But lets say you do not realize there is a real memory lifecycle and you
choose to update every hour. You will very quickly eat through the write
life of the older technology.

Just be aware of what you are writing to.
Regards
Paul
WB8TSL

On Fri, May 20, 2016 at 2:24 PM, Bob Camp <kb8tq at n1k.org> wrote:

> 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).
> >>
> >>
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> >
> > --
> >
> > Chris Albertson
> > Redondo Beach, California
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