[time-nuts] 10811 foam enclosure
EWKehren at aol.com
EWKehren at aol.com
Sun Jan 9 18:38:48 UTC 2011
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,
TimeNut at 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
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