That's a significantly bigger one than I got. -John
============= > See: > http://www.walgreens.com/store/catalog/Accessories/Kool-Kaddy-12V-Cooler/ID=prod1833617&navCount=0&navAction=push-product > <http://www.walgreens.com/store/catalog/Accessories/Kool-Kaddy-12V-Cooler/ID=prod1833617&navCount=0&navAction=push-product> > > located using search term: > cooler > > using the search term > thermoelectric > is even better > > Bruce > > Richard W. Solomon wrote: >> Can you be a little more specific about the cooler ? Walgreens >> search function is rather laborious and clumsy. >> >> Tnx, Dick, W1KSZ >> >> >> -----Original Message----- >> >>> From: "J. Forster"<[email protected]> >>> Sent: Dec 24, 2009 6:58 PM >>> To: Discussion of precise time and frequency >>> measurement<[email protected]> >>> Subject: Re: [time-nuts] Cheap Rubidium (heatpipe cooling for) >>> >>> That's why I've been suggesting active control with TE devices. >>> >>> You can buy a small TE cooler at Walgreens for about $20. It's big >>> enough >>> for a 6-pack of Coke cans and already comes in an insulated box. Add a >>> simple temperature control in series w/ the DC supply and you should be >>> well on the way. >>> >>> -John >>> >>> ================= >>> >>> >>> >>>> Hi >>>> >>>> The original intent was to simply take an existing "cheap" rubidium >>>> and do >>>> simple things to it. Tearing it into pieces and redesigning parts of >>>> it >>>> was not anything I originally contemplated. The tight integration of >>>> the >>>> physics package to the electronics would make this a fairly involved >>>> process. >>>> >>>> Bob >>>> >>>> >>>> On Dec 24, 2009, at 5:42 PM, Magnus Danielson wrote: >>>> >>>> >>>>> Hal Murray wrote: >>>>> >>>>>>> A heat pipe might work if the fluid had a sufficiently low boiling >>>>>>> point. The rubidium isn't terribly tolerant of high temperatures, >>>>>>> and >>>>>>> I'm going to pick up some heat rise as I put it inside some baffles >>>>>>> / >>>>>>> shields. You need to find something that fits a fairly narrow >>>>>>> window. >>>>>>> >>>>>> This is all backwards. >>>>>> The main reason the typical Rubidium box needs a serious heat sink >>>>>> is >>>>>> that there is an active heater inside it heating up the lamp to get >>>>>> it >>>>>> up to operating temperature. That part of the system better be >>>>>> "tolerant" of high (enough) temperature. >>>>>> >>>>> ... or a less heat-producing alternative could be used. The >>>>> Rubidium-lamp produces two wavelengths of which one is filtered by a >>>>> Rubidium-filter which leaves the final pumping wavelength. This is >>>>> what >>>>> a laser diode could supply instead. >>>>> >>>>> >>>>>> Maybe things would be a lot better/simpler if the heating/cooling we >>>>>> have been discussing were split into two sections. One for the lamp >>>>>> assembly, and a second for the electronics. >>>>>> >>>>> Most of the discussion has been on thermal isolation of the entier >>>>> units. Not what needs generates temperature and what requires >>>>> temperature stability etc. >>>>> >>>>> >>>>>> Anybody know what the thermal coefficient of the lamp is relative to >>>>>> the electronics? >>>>>> >>>>> I am not sure I know what you mean by this... >>>>> >>>>> Cheers, >>>>> Magnus >>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- [email protected] >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
