I am already rather familiar with the workings of rubidium oscillators... I have built my own before (just for fun, using a salvaged physics package).
The LPRO only has one adjustmnent pot (besides the frequency trim pot). All the other adjustments are trimmer caps and inductors. The first thing to try is that select-to-test resistor. Then the trim pot. If neither of those makes things better, I suspect that the inductors and capacitors will not help either. It is not worth spending more than a couple millichrons trying to reverse engineer the LPRO design when you can buy them for less than $100. I'd much rather just break out the diddle stick and start diddling the heck out of it... goes well my philosophy of "If it jams, force it. It it breaks, it needed fixing anyway." Only thing is the darn thing is working now. I guess the sight of my collection of diddle sticks and that 5 pound sledgehammer in the corner convinced it that it had better start behaving. ---------------------------------------- things wont get better by fooling around with the trimpots, IMO. Chances are some of the pots are quite sesitive, thus impossible to bring back to proper settings w/o detailed knowledge about the alignment procedure. I would refer to the LPRO manual that, unfortunately, doesn't contain detailed circuit and alignment information, but at least some basic functional diagrams. Then, put a manual from a well documented Rb (like the FRS) aside and try to re-engineer a detailed block diagram. This will show you how much it differs from the FRS, and what parts of the FRS manual are or aren't useful for your task. It should also show most of the functionality of the trim pots. That way, without having turned any pots, you'll have learned a lot about how the unit works, and that should be quite helpful for troubleshooting. _________________________________________________________________ Get ideas on sharing photos from people like you. Find new ways to share. http://www.windowslive.com/explore/photogallery/posts?ocid=TXT_TAGLM_WL_Photo_Gallery_082008 _______________________________________________ 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.
