[GPS_Standard] Using a Datum Rubidium Oscillator with GPS Frequency Standard

[Zack Widup]

I'm just wondering about the tolerance of accuracy of the rubidium units 
vs. deriving the accuracy from a GPS. I thought the idea of the rubidium 
standard was that it was accurate and stable enough to not need that.

I haven't really looked into it yet; I do know that the stability and 
accuracy of my stand-alone OCXO's out in the field is adequate for use as 
a reference up through 10 GHz as long as I calibrate it against something 
more accurate every once in a while. The last time I checked it didn't 
even need tweaking.

I may need something more accurate for the LO when I get my 47 and 78 GHz 
transverters done, hopefully over the winter.

73, Zack W9SZ

On Thu, 20 Nov 2008, Richard Gill wrote:

> With the current availbility of the Datum LPRO Rubidium Oscillator that are coming on the surplus market.
>
> Has anyone tried to interface one of these units with the GPS-Derived Frequency Standard?
>
> These Datum units have an external frequency adjustment input. 0Vdc to 5 Vdc on pin J1-7 and rtn on pin J1-2.
>
> Info on the Datum units is at:
>
> http://www.ham-radio.com/sbms/LPRO-101.pdf
>
> Any thoughts or ideas on this?
>
> I have not yet built my GPS Standard yet. So maybe this is the way to go.
>
> Thanks
>
> Rich  KQ6EF