Hi,
If I am understanding you correctly, you seem to think that
a rubidium cell standard is a primary reference?
The rubidium cell standard is not a primary reference. Before
you use it as a reference, you need to compare/calibrate it to a
primary standard, such as a cesium beam. Then, like a quartz
crystal, you can adjust your rubidium to the primary standard.
-Chuck Harris
Peter wrote:
Chuck Harris <cfharris@...> writes:
Paul's description is spot on.
Once the bulb is clear, you are done. The real truth is
once it is clearer than it was, it is going to work better
than it did... When it is all the way clear, it is a good
as it was when it was new, and should last as long as a
new bulb would have.
-Chuck Harris
Peter wrote:
paul swed <paulswedb <at> ...> writes:
Chuck is correct I have done this trick on FRS units. The glass clears and
the lamp re-ignites and continues to work for a long time. Actually it
hasn't failed and this must be 2 years now.
Regards
Paul
WB8TSL
Thanks to the help from members here I now have a locking FRK.
My bulb looked pretty clear, and i couldnt find any deposits or "bits"
inside, but decided to give it a good soaking at about 150 deg C using my
hot air re-work gun for about 10 mins.
I have checked it against my Racal ovened reference and found a discrepancy
of about 0.8 Hz.
Now the million dollar question...Can I be sure the FRK is good before I
start to use it as my standard frequency?
Is the FRK constructed in such a way that the frequency accuracy is assured,
or do I need some way of verifying the FRK, or calibrating it.
I dont want to trim my ovened reference to the rubidium, only to find the
rubidium is not as accurate as I thought?
Sorry if dumb questions, but just starting my quest for "time nut" status!!!
Thanks
Peter
G0RSQ
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