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 <[email protected]> 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) <[email protected]> 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." > > <image001.png>_______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
