[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.
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at lists.febo.com
>> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>> and follow the instructions there.
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.





More information about the Time-nuts_lists.febo.com mailing list