[time-nuts] Special connector for Symmetricom X72 rubidium standard
attila at kinali.ch
Sun Aug 20 20:20:56 EDT 2017
On Sun, 20 Aug 2017 16:22:18 +0000
Mark Sims <holrum at hotmail.com> wrote:
> It can also be used with the SA22.c once a board that breaks out the SA22
> connector pinouts to a 34 pin cable (8 pins are for the SA22.c +5V power/
> gnd) is built. Note the TO-220 LM7805 voltage regulator... Symmeticom does
> not deign to tell use mere peons how much current that needs. That
> regulator may need to be a switcher or need a heat sink.
Isn't this the "max warm up power" in the "X71 Design Absolute Maximum Rating"
table in the designer's refernence manual? Or am I missing something?
It states that the X72 uses 17W max 10W for 25°C ambient. Which sounds
about as much as I expect for an vapor cell standard. Though 3A on 5V
(or 2A @25°C) is a bit tough.
You know, the very powerful and the very stupid have one thing in common.
They don't alters their views to fit the facts, they alter the facts to
fit the views, which can be uncomfortable if you happen to be one of the
facts that needs altering. -- The Doctor
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