[time-nuts] WTS: Efratom PTB-100 Precision Timebase
w9gb at icloud.com
Sat Jul 7 18:50:40 EDT 2018
At the 38th Annual Symposium on Frequency Control (1984), a presentation was given on the “Lifetime and Reliability of Rubidium Discharge Lamps for Use in Atomic Frequency Standards” by Aerospace Corp., Efraton-Ball, and EG&G.
The spattering of Rubidium on the lamp’s inside glass is discussed.
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> On Jul 7, 2018, at 5:30 PM, Gregory Beat <w9gb at icloud.com> 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.
> 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.
> >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.
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