[time-nuts] FE-5680A Mechanical Question

Chris Albertson albertson.chris at gmail.com
Thu Jan 12 12:51:12 EST 2012


On Thu, Jan 12, 2012 at 9:24 AM, Bob Camp <lists at rtty.us> wrote:
> Hi
>
> You could do a "push button before unplugging" sort of thing. Only write it
> on command. That way the eprom would last forever ...
>
> Once an hour for a year would be 8760 writes. If it's a true eprom, that
> should be no problem. If it's rewriting flash, that could get exciting. I
> wonder if there's an eprom chip on the board / embedded eprom in a cpu or
 You only have to write once per if the value change from the last
hour.  With and 18 or 24 hour time constant and semi controlled
environment.  most hours you may not write.

 The controller will know very soon that the GPS is unplugged.
After the first PPS is missed.  A _very_ smart controller could look
at the RS232 data from the GPS.  Maybe even use the saw tooth
correction data to adjust the PPS.

I want the controller to notice a dead GPS anyway, that is how you do
automatic holdover.  Ideally it would read the serial data from the
GPS and only adjust the DDS when the GPS was in lock.



Chris Albertson
Redondo Beach, California




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