[time-nuts] The 10811 double oven mystery

[Hal Murray]

kb8tq at 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.