[time-nuts] Rb standard questions
Bob Camp
lists at rtty.us
Mon Aug 12 17:55:21 EDT 2013
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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