[time-nuts] Rb standard questions

[paul swed]

Everything I have seems to be pre 2005 of the units I am thinking of. They
are 1998 region.
Best regards Bob.
Paul


On Mon, Aug 12, 2013 at 8:07 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> They made a change on the Efratom Rb's some time around 2005 that boosted
> the "normal" lamp voltage by about 3 volts. Without tracing out the
> circuit(s) there's no way know if they just bumped the bias voltage up or
> what they did. An "old" lamp voltage unit probably is ok to 4 volts or so.
> I'm not sure if the same is true of the newer "9 volt" units.
>
> Bob
>
> On Aug 12, 2013, at 6:52 PM, paul swed <paulswedb at gmail.com> wrote:
>
> > From those voltages I speculate a long life. In the various RBs I have
> > 2-3.5 V seems to be trouble.
> > Every units a bit different. When the units gets very old you will see
> the
> > lamp re-ignite. Generally this will be noticed as a significant random
> > phase jump. If you have a lock light it will go out for 30-60 or so
> seconds
> > until the system comes back on.
> > When I get an old rb I attach a cheap digital pedometer with an opto
> > coupler etc (Could be a FET or transistor just as easily) to the lock
> > signal. It increments every time the system unlocks. Humorously I call
> it a
> > loc-O-meter.
> > Regards
> > Paul
> > WB8TSL
> >
> >
> > On Mon, Aug 12, 2013 at 5:55 PM, Bob Camp <lists at rtty.us> wrote:
> >
> >> Hi
> >>
> >> On Aug 12, 2013, at 3:21 PM, Yuri Ostry <yuri at ostry.ru> wrote:
> >>
> >>> Hello,
> >>>
> >>> Tuesday, July 30, 2013, 3:03:57, Bob Camp wrote:
> >>>
> >>>>> 3) what is the typical life of such a unit?
> >>>
> >>> B> If it's run without a heat sink, about two years.
> >>>
> >>> B> If it's power off on the shelf,  many decades.
> >>>
> >>> There was another "aging factor" mentioned in some documents that
> >>> circulate around the net. Helium can diffuse from atmosphere through
> >>> glass walls ans change buffer gas composition inside the cells.
> >>
> >> From what I have seen of "stored" cells - it's not a major issue.
> >>
> >>>
> >>> Run well cooled, >> 10 years for 90% of the units
> >>>
> >>> As I can see, my FRS-C still works well after approx 10 yrs on a cell
> >>> site working 24/7 and 5 yrs sitting on the shelf. But lamp voltage
> >>> that was recorded 5 yrs ago differs from the one that I measured
> >>> when I put it back to work. It is lowered little bit.
> >>
> >> The key question is - was it powered up in the cell site or simply
> sitting
> >> powered down? A *lot* of the cell site Rb's were in "emergency backup"
> >> applications (cell sites on trucks …). They sat around for 10 years, but
> >> didn't run for very long at all.
> >>
> >> Bob
> >>
> >>>
> >>> 73!
> >>> Yuri
> >>> UA3ATQ/KI7XJ
> >>> --
> >>> Best regards,
> >>> Yuri                          mailto:yuri at ostry.ru
> >>>
> >>>
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