Well indeed Magnus the black stuff and silver blob were rb. 300 degrees F for 15 minutes made it all go away. I was using a j thermocouple to measure the temp and right at the bulb. The trick seems to be for a FRS c to get the blob to the lowest point of the capsule thats observable. I did this with the normal RB power system heated to 177 degrees. Gently tapped a few times to get it concentrated. Then powered off and let it cool. Next step hung the assembly from a lamp so the heat gun could be pointed straight up to boil the RB off at 300 degrees for 10 minutes and let it go for 5 more for good luck. The dark area on the capsule is significantly reduced and no trace of the silver blob. During the heating I could actually see the silver blob shrink. The RB lamp lights well and looks good. Now to try reassembling everything. That will be a job. Regards Paul WB8TSL
On Sat, Feb 12, 2011 at 5:07 PM, Magnus Danielson < [email protected]> wrote: > Dear Paul, > > > On 12/02/11 21:34, paul swed wrote: > >> Hello to the group >> Finally received the heat gun this week and attempted to recover a FRS c >> Rb >> lamp. >> In the bad lamp you can actually see a small silver blob and on closer >> inspection the center of the bulb front has a small circle of something. >> When heated by the normal oven at 177 degrees F the silver blob will move >> around. The center dark area does not. >> >> I wonder if this dark center is attenuating the Rb light. >> > > I bet it is a thin layer of Rb... so yes. > > > Do not really want to take the temperature higher. Magnus could remove his >> Rb capsule. The FRS lamp is glued in and I can not get it out. >> My concern is that the surrounding electronics might literally get fried. >> (Suppose it doesn't matter) >> >> Magnus any idea how hot you may have run your lamp to get the stuff to >> boil >> off and how long at that temperature? >> > > I did not measure the temperature, but I was able to heat it up fairly > quickly with my small heat-gun, despite the fact that the removal tool was > cooling it off... maybe I was heating it for 5 min or so... but I was able > to have the dark shade evaporating. > > > In order to prove there is more light I will need to do a lot of >> re-assembly >> to get the system to the lamp detection stage so I can measure it. The >> voltage had been 1.83 volts before it simply would not work. So anything >> above that would make all this worth while. >> > > It is well worth the effort, but the ability to heat it may vary. > > Cheers, > Magnus > > _______________________________________________ > 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. > _______________________________________________ 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.
