Thomas, Dan, Magnus, Graham --
Thanks for the replies!
This is an interesting example of "no two oscillators are the same."
I certainly expected that there would be aging and retrace on a cold
oscillator, but I started both Z3801As almost simultaneously and within
about 12 hours unit #1 had stabilized and the EFC was showing normal
noise over a fairly small range with no real trend apparent.
But unit #2 (the one shown in the plots) continued to have the very
pronounced aging trend of after 12 hours, with one click per minute more
than a day after power-on, as well as having a much higher absolute EFC
value than it did before, or than unit #1 has now.
So, based on unit #1, I was suspicious of what was going on in the
second unit. It may just be that #2 doesn't have as good an oscillator
as #1.
John
----
Thomas S. Knutsen said the following on 07/16/2011 05:32 PM:
I think it is in Matthys, Crystal oscillator circuits. Can't quote
page number now, as my verson is somwhere I cant remember. It's an
excellent book if you do some experimentation.
I did write an letter to R.J. Matthys a couple of years ago, and
reveiced an answer.
73 de Thomas LA3PNA/AE5YS.
2011/7/16 Dan Rae<dan...@verizon.net>:
One crystal expert, who's name escapes me, sorry, told me that if you power
up an oscillator that has been off for an extended period, you should expect
a very rapid ageing process to occur with a lot of the accumulated changes
that would have happened had it been powered on then to occur when it was
restarted.
But I can't quote chapter and verse, obviously.
Dan
ac6ao
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