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

[Brian Alsop]

Hi Alan,

Just did this.  Less than 0.005 Hz.

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.

Circuit    LPRO power voltage -----LT1236---- POT---- GND
                                       |        |____ >CFIELD PIN
                                      GND

On the adjustment,  you tweak it and wait about 10 minutes to see what 
it does.  Then tweak again.

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

Regards,
Brian
On 8/16/2013 13:41, Alan Kamrowski II wrote:
> Hi Everyone,
>
>
>
> I'm going to try to calibrate my LPRO 101 to a GPS 1pps signal.
>
>
>
> Does anyone know what "one turn clockwise" of the c field adjustment pot
> will do to the signal in terms of ppb ?
>
>
>
> Thanks,
>
>
>
> Alan
>
>
>
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Version: 2012.0.2242 / Virus Database: 3211/6082 - Release Date: 08/16/13