Hi Ed,
On 04/28/2012 08:43 PM, Ed Palmer wrote:
First, I'd like to thank Magnus, Joe, Paul, and Ed for taking the time
to provide answers, ideas, and challenges to my assumptions. It has all
been very helpful. I'm still working on it so I don't have a resolution
yet.
Happy to help, while not tossing you necessarily the solution, we have
to read up and we all learn in the process... which was kind of the
point with the exercise.
Second, pictures. If anyone is interested, check out
http://s701.photobucket.com/albums/ww18/edpalmer42/Tracor%20304-B/ .
Nice photos. Thanks. GAS building up.
Third, I'd like to build an extender board, but I can't find the
connectors. The contacts are called Varicon and are used both on circuit
boards and in connectors. The connector version is available, but I
can't find the board version. The last picture in the above gallery
shows a close-up of the connectors. They were available in regular and
mini versions. I need the regular ones that stand about 4.3 mm high. The
minis are about 3.5 mm high and won't mate with the regular ones. New
ones could be loose or spaced out on a plastic strip to make
installation easier.
Fourth, I'm currently working on the cavity tuning. Does anyone know of
a document or research paper that discusses cavity sizes for Rb
standards - preferably with equations? I found this document:
http://www.alcatel-lucent.com/bstj/vol25-1946/articles/bstj25-3-408.pdf
Good article. Thanks for the reference.
that talks about cavities in general, but the calculations don't work.
I'm guessing that the Rb cell is changing the resonant frequency of the
cavity.
The glass pulls the cavity resonance somewhat, yes. A TE111 resonance
mode is typically used, allowing light to enter and leave at the ends of
the cylinder.
TE011 was used before, but it much larger.
Todays modern cells use a "loaded" cell (dielectrum added) to move the
resonance frequency down, which allows much smaller physical cells.
W.J.Riley "Rubidium Frequency Standard Primer" is a good starting-point,
but following the references should help.
I think just searching for "TE111 mode rubidium" cranks out a few
interesting things, such as:
http://dspace.thapar.edu:8080/dspace/bitstream/10266/968/1/Satyendr_Thesis.pdf
Cheers,
Magnus
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