Other thing I have no clue to. What happens to photocells after X years. I suspect they degrade also. Since thats the frontend of the rcvr that would do quite a number. Regards
On Sat, Apr 28, 2012 at 7:37 PM, Magnus Danielson < [email protected]> wrote: > 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/<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<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<http://dspace.thapar.edu:8080/dspace/bitstream/10266/968/1/Satyendr_Thesis.pdf> > > Cheers, > Magnus > > > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
