[time-nuts] LPRO 101 - does anyone know how much the C Field pot changes and what direction?

Alan Kamrowski II alank2 at earthlink.net
Fri Aug 16 10:00:54 EDT 2013


Hi Brian,

>Just did this.  Less than 0.005 Hz.

Thank you - was clockwise 0.005 higher or lower?

My Rb is about 0.000731284 fast according to my estimate.

>To really fine tune it, you need to used the C-field adjustment pin.
>This circuit is simple.  A Linear Technology LT1236 precision 5V regulator
and a 
>10 K linear 20+ turn pot.  You can get a sample of the chip free from
Linear Technology.

It is connected to a RFTGm-II-Rb control board which already supplies the
C-field adj pin...  I may try to get a matching gps and feed it in to see if
it will discipline.

>Do this with the LPRO in its enclosure after it has run at least a day.

I can only get to the adjustment hole outside of the enclosure, but I've
tried to put it in the same thermal condition it would be normally.  It is
sitting on top of a heat sink with a fan on it and the temp seems about the
same it as usually is so hopefully this will not affect it.

Thanks,

Alan



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