Would't it be helpful to blow a gentle jet of cooler air on the tipoff region during the rejuvenation procedure, to encourage condensation there?
Dana On Sat, Jul 7, 2018 at 6:37 PM, Magnus Danielson <mag...@rubidium.dyndns.org > wrote: > Hi, > > On 07/08/2018 12:30 AM, Gregory Beat via time-nuts wrote: > > In 2008, G Molenkamp, VK3UM noted that of the 20 Efratom model FRS-C > units he restored, component failure due to long heat exposure caused most > of the failures. > > http://www.vk3um.com/Rubidium%20rejuvination.pdf > > He notes that some lamps had Rb splattered over the inside wall of the > glass. > > In these cases, the Rb material was not consolidated in the “pinch of > the glass lamp”. > > Using the “heat gun process” he was able to rejuvenate those Rb lamps. > > I later tried that method on my R&S XSRM rubidium, with good progress. I > have reported on that on the list way back. It took two attempts, one > just to realize that I needed to keep the pinch at the top, because that > is where the hot atoms go. > > Essentially, the thin film of rubidium will consume too much of the > radiation to emit any useful amount of pumping light. Heating it has the > rubidium go into gas and then collect somewhere cold, so it's just about > making sure that somewhere cold isn't the glass where it is to emit light. > > My XSRM have however other issues that I need to attend to. > > Cheers, > Magnus > > > w9gb > > == > >> Time-Nuts Group, > >> For someone interested in working on the Rb package which I believe is > the > >> FRK series. Worked great in my lab for years and recently started being > real > >> slow to lock during power cycles and now won't lock at all. Not sure > what > >> the fair asking price would be in this condition. Maybe someone has > >> repair/refurb experience with the Efratom FRK. > >> Contact me if interested. > >> Don > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to http://lists.febo.com/mailman/ > listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/ > listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.