[time-nuts] T-bolt steering an LPRO...?

Chris Albertson albertson.chris at gmail.com
Sun Apr 15 19:32:08 UTC 2012


Many times when you search an archive you get a lot more information than
you can use.  Let us know what you find in your search of the archives.

I'm planning on doing something like this too, only using one of the "new"
FE5680A units.   My plan is to use a  74HCT4046 as the phase detector.  I
can put both the reference 10MHz and the 10MHz from the Rb into the
74hc4046 and the chip will tell me if they are in lock.  Pretty much a one
chip solution for $2.   Then a microprocessor (Arduino) reads the lock pin
and sends an RS232 command to the FE5680.  I will also have the uP send
status to a small 2x16 LCD text display.    After this works I can easily
move the software over to an AVR and free up the more expensive Arduino.

This would be a much harder problem if the GPS only had a 1Hz PPS.  But
with a 10MHz output it is a simple project.  How ever the time constants in
the firm ware will need to be tweaked and it will lily take weeks to find
what works best.  I assume with a Rb that the constants are hours or days
long.




On Sun, Apr 15, 2012 at 6:03 AM, Michael Baker <mpb45 at clanbaker.org> wrote:

> Time-nutters--
>
> Some time ago I queried the list for info on how to connect
> and steer an LPRO-101  Rb oscillator with a T-bolt.   Now that
> I am ready to start on that project I can't find the responses I
> got from the list.
>
>  I apologize for this repeat of my original query but it is not
> my fault--  Mice sneak in at night and mess with my computer
> and lose my saved files....  (that's my story and I am sticking
> with it!).
>
> Thanks (again) for any feedback on this!!
>
> Mike Baker
> -----------------------------
>
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-- 

Chris Albertson
Redondo Beach, California


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