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.
