By the way I can disconnect pin 1 on the lamp assembly because I made a 5" jumper assembly so that the area can be easily worked on.
On Sat, Feb 12, 2011 at 10:27 PM, paul swed <[email protected]> wrote: > Well pretty good news > The lamp voltage went from 1.83 volts a dead bulb to* 8.9 volts a new bulb > *. > By adjusting the oscillator I can get to 9.6 volts but I know the the > oscillator will not start correctly at 82 Mhz its happy at 92 Mhz. > Its not locking but that can be due to several issues. > At least 3 grounds are not connected. These are completed by the boards > being mounted on the oven. > The +24 lamp ignition is hanging at +17. So again the grounds or I have a > problem in the lamp regulator. I suspect its the grounds actually. I > disconnected pin 1 into the oven and applied 24 volts when the lamp ignited > manually backed it down to 17volts. > So tomorrow will start to reassemble the boards for correct grounding. > Regards > Paul. > > > On Sat, Feb 12, 2011 at 7:57 PM, Magnus Danielson < > [email protected]> wrote: > >> Dear Paul, >> >> >> On 13/02/11 00:02, paul swed wrote: >> >>> 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. >>> >> >> I had mine go greyish on the first heat-up, but then I cleared it on the >> second run. >> >> >> 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. >>> >> >> Good news! >> >> Eager to hear of lock-up results! >> >> It seems like the normal temperature of the bulb is good for keeping it >> lit, but you need to go further up for the clean-up operation. Maybe this is >> why the grey rubidium-coating didn't rub off for others... they didn't go >> high enough. Still, no extreme temperatures is needed to get the job done. >> >> >> 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.
