[time-nuts] Rubidium Cells for Sale ?!
Bob kb8tq
kb8tq at n1k.org
Tue May 7 23:00:09 UTC 2019
Hi
Nope, the main issue is that “space benign” (to use the old Mil-HBK-217 term) is indeed pretty
benign. No air pressure change to worry about and a pretty narrow temperature range. Also not
a lot of shock and vibration (once you get there ….) :)
Bob
> On May 7, 2019, at 5:40 PM, jimlux <jimlux at earthlink.net> wrote:
>
> On 5/7/19 2:16 PM, Bob kb8tq wrote:
>> Hi
>> Well, given the price, running it in a thermal-vac chamber would not significantly increase
>> the charges to your credit card :)
>
> But perhaps Poul-Henning was thinking about the gravitational force.
> So you could buy two, and drop them alternately down a pair of evacuated drop towers.
>
>
> I did notice that the temperature range is quite small for flight hardware (typical design range might be -10 to +55) - but then, they're mounted in a fairly large satellite and that's basically putting the thermal engineering responsibility on the satellite bus engineers. Holding within 5 degrees nominal is fairly straightforward
>
> it's people wanting to hold milliKelvins that are the ones making trouble.
>
>
>> Bob
>>> On May 7, 2019, at 3:23 PM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
>>>
>>> --------
>>> In message <BFAC22A1-27AE-4B1F-8FDF-EEC87133BB41 at n1k.org>, Bob kb8tq writes:
>>>
>>>> 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.
>>>
>>> Rumours has it that the design is optimized for space use and therefore
>>> not quite as fantastic at sea-level.
>>>
>>> --
>>> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
>>> phk at FreeBSD.ORG | TCP/IP since RFC 956
>>> FreeBSD committer | BSD since 4.3-tahoe
>>> Never attribute to malice what can adequately be explained by incompetence.
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>
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