Rix
Just how did you set up the tbolt to use the lpro as an external oscillator?
See John Miles site for notes of how to modify a Tbolt for use with an external Osc.
http://www.ke5fx.com/tbolt.htm I just use the 10 MHz from the LPRO instead of the 10811 that he usedsee my post "Tbolt disciplined LPRO Rubidium" on May 13 2011 for how to set the Tbolt for extended TC
http://www.febo.com/pipermail/time-nuts/2011-May/056526.htmlAttached is a 9 day LH test run where I was trying different Time constants etc. One of the important steps, Not show in that plot, is to check the loop recovery response by causing an intentional Freq or phase step error. If you have any trouble with it, let me know cause there may be typos in how I did it but it worked fine.
ws ****************************** [time-nuts] LPRO Rubidium schematics Rix Seacord eseacord at verizon.net 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 845-628-0892 Home 914-262-9186 Cell *********************** 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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