[time-nuts] WTS: Efratom PTB-100 Precision Timebase

Dana Whitlow k8yumdoober at gmail.com
Sat Jul 7 20:02:39 EDT 2018


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 <magnus at 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
> >
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