Thanks for the pointer on the C-field. Yes, it aligns with the small 
hole in the case. A lucky 1/4 counter clockwise turn reversed the drift 
from 450 nsec per hour to 200 nsec in 10 hours. That accuracy begins to 
rival the GPS signal over the range. I plan to leave it alone for a 
couple of days. This unit is now performing very well.

Thank you. Let me know if there is anything would like me to look into.  
- Dan kb0qil

Mark Sims wrote:
> Hello Dan,
>
> I think the C-field pot is the one accessible through the hole in the outer 
> cover.  If you don't have the cover,  it is on one side of the physics 
> package can near the top, center.
>
> I never messed with the reset pin.  The RS-232  interface works just fine.  
> Most of my units are the version without the DB-9 connector.  They have the 
> RS-232 level converter chip and use the S,F interface.   If you ever got any 
> S,F data out of your device,  that is the interface that it uses.
>
> I do have one unit that is probably like yours.  It has the DB-9 connector 
> (but I don't think it has the level converter chip).  It is set for 15 MHz.  
> I have not used it,  so I don't know any details...
>
> ----------------------------------------
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