[time-nuts] Re: Frequency Standard - Where Can I Get One.

[Bob kb8tq]

Hi

Well, if I could keep a 5065 running without repairs for more than a couple years
I might be more willing to agree with you. What makes the 5065 different is that you
have schematics and can do repairs. When the telecom gizmos die, there’s not much
to fall back on. They were designed to run a finite amount of time and then go to the
scrap heap. 

Bob

> On Nov 21, 2021, at 12:03 PM, Skip Withrow <skip.withrow at gmail.com> wrote:
> 
> Hello Time-Nuts,
> 
> No offense Bob, but I would like to take issue with your statement 'Rb
> standards have a finite life'.
> 
> There are time-nuts on this list of every skill and knowledge level
> and I would like to keep the information as correct as possible.  My
> feeling is this is not a true statement.
> 
> There is nothing inherent in the design of a rubidium frequency
> standard that limits its life (unlike cesium).  However, there are
> manufacturing choices that can possibly limit time before failure.
> 
> First example, of course, is the HP 5065.  There are many of us that
> have units that have been running continuously for close to 50 years.
> HP made choices in their bulb design that ensures that it runs for a
> very long time.
> 
> An opposite example would be the Tracor rubidiums.  The lamps in these
> units were either horribly underfilled, or the glass was very reactive
> with Rb and almost all suffered from rather early lamp failures.
> 
> Then, there is the huge mass of telecom rubidiums.  As you stated,
> keeping the base plate at a reasonable temperature goes a LONG way to
> extended life.  Excessive temperature obviously leads to higher
> component (and sometimes lamp) failure.
> 
> There are also units that just did not have enough design margin in
> certain areas.  The SRS PRS-10 is one of these where I have seen
> things go up in smoke in the lamp area.  BTW, the HP 5065 can have
> some issues in this area as well.
> 
> I'm obviously a big fan of rubidium frequency standards.  My advice to
> newer time-nuts is that you can't go wrong owning one (better long
> term stability than OCXO, lots less cost and longer life than cesium).
> 
> I'll get off the soap box now.  Thanks for the bandwidth.
> 
> Skip Withrow
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