[time-nuts] Rubidium Cells for Sale ?!

[Bob kb8tq]

Hi

It was EG&G Frequency Products back when I worked for them (not
in Salem, but still the same division). 

They then bought Perkin Elmer and changed the name. Now they seem
to be somebody else ..,.,.

=======

You can go into whatever loops you care to about the way space products
are done. The gotcha is that making *sure* it’s done right is way cheaper than
sending a tech to Mars to fix this or that. Right now they are saving a ton of 
money because the “old” GPS sats (with the EG&G Rb’s in them ) just will not 
die. Thus they have waited a decade to send up the replacements ….

Before we start hearing “well, noting ever breaks these days” …. how is the
Galileo system doing for frequency standard reliability ? :)

======

In terms of “I don’t want one” …. well, they are pretty much the best Rb ever
made anywhere / ever. They are as close as you will get to a maser and 
not *be* a maser. 

Bob

> On May 6, 2019, at 9:51 PM, jimlux <jimlux at earthlink.net> wrote:
> 
> On 5/6/19 3:54 PM, Bob kb8tq wrote:
>> Hi
>> Back a while ago it was in the “over a million dollars” range.  Like anything that
>> is designed for space use, the price is meaningless until you sort through what
>> kind of paperwork this or that program requires.
> 
> 
> Yeah, this one:
> Radiation
> Hardened to withstand natural and manmade space environments, including phase- continuous operation through transient radiation
> 
> is a pain.
> 
> The vibe is high, but not mindbending they don't say whether it's sine or random. But as a comparison the usual cubesat qualification level is 14grms...
> 
> 
> Who was Excelitas originally?  Salem, MA  - is it EG&G?
> 
> 
> 
>> Bob
>>> On May 6, 2019, at 5:37 PM, William H. Fite <omniryx at gmail.com> wrote:
>>> 
>>> Anyone know the price of the Excelitas device? No, I'm not interested in
>>> purchasing one, just curious. I assume it is hair-curling expensive.
>>> 
>>> 
>>> On Monday, May 6, 2019, Bob kb8tq <kb8tq at n1k.org> wrote:
>>> 
>>>> Hi
>>>> 
>>>> Ummm ….. errrr ….. the Efratom Rb’s use an integrated lamp plus one cell.
>>>> 
>>>> http://www.wriley.com/A%20Modern%20MIL%20Rubidium%
>>>> 20Frequency%20Standard.pdf <http://www.wriley.com/A%
>>>> 20Modern%20MIL%20Rubidium%20Frequency%20Standard.pdf>
>>>> 
>>>> There still are a lot of people doing the lamp plus two approach. One of
>>>> many:
>>>> 
>>>> http://www.excelitas.com/Downloads/DTS_Frequency_Standards_RAFS.pdf <
>>>> http://www.excelitas.com/Downloads/DTS_Frequency_Standards_RAFS.pdf>
>>>> 
>>>> Bob
>>>> 
>>>>> On May 6, 2019, at 3:23 PM, Ed Palmer <ed_palmer at sasktel.net> wrote:
>>>>> 
>>>>> 
>>>>> 
>>>>> On 2019-05-06 10:00 AM,  Bob kb8tq <kb8tq at n1k.org>wrote:
>>>>>> Hi
>>>>>> 
>>>>>> I?m sure they are good cells. The gotcha is ?which one is it??. A
>>>> normal Rb has multiple
>>>>>> cells doing different things. You ? umm? errr ? need a set of cells ?.
>>>>> 
>>>>> Why do you think I posed the question "Anybody feeling lucky (or
>>>> desperate!)?"?  Don't forget that all(?) newer Rb standards use an
>>>> integrated cell so it's a 'set' of one.  Whether that's the case here is
>>>> unknown, but not likely given the size of this cell.
>>>>> 
>>>>> The only Russian Rb company I've heard of is Kvarz.  Has anyone seen a
>>>> cell from one of their old units?
>>>>> 
>>>>> Ed
>>>>> 
>>>>> 
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>>> 
>>> -- 
>>> Homo sum humani a me nihil alienum puto.
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