[time-nuts] LPRO Rubidium schematics

Rix Seacord eseacord at verizon.net
Wed Jun 1 16:27:10 UTC 2011


Warren
Just how did you set up the tbolt to use the lpro as an external oscillator?
I have both and would like to do the same.
Thanks

Rix Seacord K2AVP
eseacord at verizon.net

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On 6/1/2011 11:48 AM, WarrenS wrote:
> LPRO time nuts,
>
> Is there a complete set of schematics available for the Efratom LPRO-101 Rubidium  oscillator?
> I have the "Repair reference guide by Fred de Vries, PE1FBO, Revision 6, 2010" which is very useful, but unfortunately it includes only some of the schematics.
> What I'm looking for is a schematic of the 20 MHz osc section and it's control loop.
>
> In an ongoing effort to initially see how good,  and ultimately how simple,  I can improve the performance of a LPRO based oscillator system,
> I've started with the basics by using a low noise 10811 as a clean up osc to improve the under 100 sec noise.
> To minimize any room temperature swings from effecting the performance, I've added an active temperature controller to keep the base plate heat sink temperature constant.
> To remove long term daily drift and get absolute freq accuracy, I'm using the C-field to discipline it to GPS.
> For that  I'm using the LPRO as the external oscillator for a Tbolt and set the Tbolt's extended time constant at 12 to 24 hrs using Lady Heather.
> The results to date are very encouraging and show substantial improvement over the whole tau range from 0.01 sec out to days, in effect providing a low cost Cs substitute.
>
> ws
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