[time-nuts] CS reservoir depletion

paul swed paulswedb at gmail.com
Fri Jan 14 14:10:28 UTC 2011

That is one thing I noticed even without the CS the system is very stable
with the Xtal.
My comment was tagging on to a previous one and I couldn't resist the fact
that I get might old stuff.
Good comment on the standard. Indeed I run my 5065 every month or so for a
day or two insuring its stable and no problems have or are cropping up.
My 5061 came from the Naval observatory. I just know the next hamfest or MIT
flea I will find a new tube for it for $10 or 20. Not to likely.

On Fri, Jan 14, 2011 at 1:01 AM, Tom Van Baak <tvb at leapsecond.com> wrote:

> Hi Tom been quite a while hope you are well.
>> The never run out comments, not from me. Look at the
>> previous thread I tagged onto. My humor is that most of
>> the CS tubes we get are very long in the tooth usually
>> way past whatever anyone would say they are good for.
> That is so true. It always amazes to pick up a 30 year old
> 5061A and find that it still works. Sometimes the reason is
> that it is already on its 2nd or 3rd replacement tube before
> it went to surplus. In which case you're happy for years.
> Other times it may be that the 5061A was used only very
> intermittently and the tube is the low S/N original.
> A real gem would be one that was kept in cs-off mode except
> for a few hours once a month to keep the OCXO within some
> loose cal lab spec. Even after decades it would be as good
> as new.
> For many frequency applications there is no reason to run
> in full cs-locked mode. This is also true if you need good
> short-term stability. The free-running OCXO in most Cs (and
> GPSDO for that matter) are more stable short-term when the
> loop is open.
> /tvb
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