Hi Running a hard disk at -40 C is pretty much a no-go sort of thing. Even finding CPU or FPGA chips rated for operation down there is difficult / expensive. DRAM chips with the “right” timing … not so much. Bottom line - the heater / HVAC costs *way* less than designing all that stuff to work over a wide temperature range.
Bob > On Apr 8, 2020, at 9:58 PM, Hal Murray <hmur...@megapathdsl.net> wrote: > > > kb...@n1k.org said: >> Well, based on conversations with the people who designed the part, the >> outer oven’s only function was to take care of a potential cold end problem. >> At the time, the telecom guys were thinking of putting GPSDO’s in systems >> with no heating on the enclosures. That idea died when they ran into a >> variety of issues with the digital side of things at cold temperatures. > > What's the problem with digital gear at cold temperatures? The only one I > can > think of is that electrolytic capacitors stop working when the electrolyte > freezes. > > Do signal integrity problems appear when the rise time from CMOS drivers gets > faster? > > What sort of warmth did the telecom guys decide they needed? I live in > California, at sea level rather than up in the mountains. We get occasional > freezing from radiation cooling on clear nights. They wouldn't have to work > very hard to keep a box above freezing. I'll have to look closer the next > time I see some cell phone antennas. > > > -- > These are my opinions. I hate spam. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@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@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
