Hi What ever you do, take the extra step of checking the baseplate temperature once you have things up and running. The Rb’s will *work* over a wide temperature range. The region over which they will last a long time is a bit more narrow. I seem to have spent a lot of time demonstrating that. Keeping the baseplate below 40C (and above 10) does indeed extend their lifespan.
Bob > On Dec 16, 2014, at 12:54 PM, Clint Turner <tur...@ussc.com> wrote: > > Hello, > > I've mounted both my LPRO-101 and FE-5680 in Hammond 1590-type cast aluminum > boxes, bolting the rubidium unit to the lid of said box, and found the heat > sinking of the entire arrangement to be entirely adequate. In each case > there is a (well filtered!) switching regulator present that contributes > little to the overall thermal load as well as allowing them to run directly > from a standard "12 volt" equipment bus. > > If you run the units at their minimum allowed voltage (19 volts for the > LPRO-101, 15 volts for the FE-5680, IIRC) they will dissipate much less power > as the regulators contained therein are linear type. It struck me that at > the lower limit voltages that they take slightly longer to warm up and come > online, but still somewhere around the 3 minute mark for a "Physics Lock." > > Details may be found at: > > http://www.ka7oei.com/10meg_rubidium1.html - For the LPRO > > http://www.ka7oei.com/10_MHz_Rubidium_FE-5680A.html - For the '5680, of > course! > > 73, > > Clint > KA7OEI > > >> On 16 December 2014 at 12:16, Bob Camp<kb...@n1k.org> wrote: >>> Hi >>> >>> One fairly important issue - the unit needs to be on a heat sink. If you >> run it without cooling of some sort, it will not run for very many years. >>> Bob >> I do realize that, but how big? Normally "the bigger the better" is >> not an unreasonable rule on heatsinks, but I have heard that cooling >> these too much is bad. I have here a heatsink about 600 x 300 x 150 >> mm, although I think that is a bit OTT !! >> >> Dave > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
