Graham, I have no problems with my 10811 I just want to experiment with ways to improve performance, right now I have several that are in the E-13 range between 1 and 100 sec and am getting greedy and looking for ways to improve one of them. Want to take it step by step and not degrade a device. I always have the D/A with the Rb or oscillator and the first tests will be done with out a loop but there are enough wires to place the D/A inside the dewar. I may also use a later D/A. Bert In a message dated 1/9/2011 12:35:29 P.M. Eastern Standard Time, time...@austin.rr.com writes:
Bert: Make sure you are working on the correct problem. I find that the normal (in accordance with published specifications) daily aging of the crystal exceeds the daily variation of frequency with temperature of a stock 10811 in a benign (office or home) environment. If you are seeing frequency variations with temperature, look at the stability/regulation of the voltages you are feeding the oscillator. Particularly, the stability of the reference you are using for frequency control steering of the oscillator. There are much better voltage reference sources available today than what Shera used. You might be better off putting the control voltage reference in the Dewar, and leaving the 10811 outside. :-) --- Graham / KE9H _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.