[time-nuts] Need help in test board pinout for SA22.c oscillator - thanks in advance

[Andrew Rodland]

I remember when I started experimenting with Rb and I thought "why
would I want to give it more cooling? That's just more contact with
the outside world, and more chance for the room temperature variation
to throw things off. I'll just put it on the desk, it'll be more
stable that way."

And then someone finally got through to me: the Rb has a heater to
regulate the temperature, but the heater can only regulate temperature
*up*, not *down*. If you have enough cooling to remove the operating
heat output plus some fraction of the heater's output, at the
specified case temperature and your range of room temperatures, then
the heater will operate some fraction of the time and the physics
package temperature will be well-regulated. With less cooling than
that, the temperature becomes effectively unregulated, because if the
unit is too hot, the heater can't help.

Of course, lots of thermal mass in the heatsink helps too if you want
to damp out the effects of air-conditioner cycling and the like.

On Thu, Nov 7, 2019 at 8:18 PM Bob kb8tq <kb8tq at n1k.org> wrote:
>
> Hi
>
> You probably need more heat sinking than that assembly provides. It’s a case of “better to much
> than to little”. The life of the device will extended with more heat sinking.
>
> Bob
>
> > On Nov 7, 2019, at 2:47 PM, Fio Cattaneo (.US) <fio at cattaneo.us> wrote:
> >
> > Hello folks, I just got a Symmetricom SA22.C oscillator on Ebay. The
> > oscillator comes mounted on a test board which seems to drastically reduce
> > the number of pins (I’m guessing it consolidates all the GND and VDD pins
> > in one) and potentially obviating the need of providing both +15V and +5V
> > (looks like there is a voltage regulator).
> >
> >
> >
> > However, I do not recognize the board (it’s definitely not the one shown in
> > the SA22.C user manual), so I’m asking here…… Thanks much in advance !
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > --- Fio Cattaneo
> >
> >
> >
> > Universal AC, can Entropy be reversed? -- "THERE IS AS YET INSUFFICIENT
> > DATA FOR A MEANINGFUL ANSWER."
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