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

Dana Whitlow k8yumdoober at gmail.com
Sun Jul 8 18:47:01 EDT 2018

Don, I've noticed that in general IEEE retains copyright on most stuff they
I've been a member for more than 20 years, and this galls me.  For an
that purports to be for the good of mankind, they seem awfully stingy with
information they gather.  But if you do acquire papers from IEEE, you are
*not *authorized to publish or distribute it further without getting
explicit permission
(and probably paying for it).

Sometimes I wonder why I hang onto the organizaiton- perhaps it's because,
a retiree, I'm unable to subscribe to all the usual "freebie" rags.  I
still very much
want to keep up with developments in my field.


On Sun, Jul 8, 2018 at 2:09 PM, djl <djl at montana.com> wrote:

> Greg et.al. IEEE stuff is just too expensive for single purchase. I have
> found, to my sorrow over 40 odd years, that they also do not contain <real>
> information, that is, info of actual use, because some other company or
> person might actually benefit. In other words, the papers are markers in
> the sand.
> Now, this is my own opinion, a bit harsh, admittedly. Of course the
> citations do need to be mentioned.
> BTW, any published material generated with government funds that is not
> classified belongs to the people, and is not copyrighted. I wonder if that
> includes IEEE papers? that is, if anyone buys one, it can be copied or
> distributed without restriction?
> Not being in the lawyer class, I can't say for sure...
> Thanks
> Don
> On 2018-07-08 10:39, Gregory Beat via time-nuts wrote:
>> Magnus -
>> When I scan/read the 1984 IEEE document, “Lifetime and Reliability of
>> Rubidium Discharge Lamps for Use in Atomic Frequency Standards”
>> by Aerospace Corp., Efraton-Ball, and EG&G.
>> https://ieeexplore.ieee.org/document/1537723/
>> The failure of the rubidium lamps used on early NAVSTAR satellites,
>> was the reason for in-depth studies of the Rb lamp, its lifetime and
>> failure mechanism.
>> greg
>> Hi -
>>> 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
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> --
> Dr. Don Latham
> PO Box 404, Frenchtown, MT, 59834
> VOX: 406-626-4304
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