On 1/6/2012 4:14 PM, Rick Karlquist wrote:
Before making this into a science project, consider this data point: We converted the oscillator in a 10811 to run in mode B at 10.95 MHz. The tempco in mode B is about 30 ppm per degree C. Needless to say, the converted 10811 was extremely sensitive to crystal temperature. I could wave my hands around it and notice the temperature change from the air currents. However, simply putting the 10811 into a small empty cardboard box completely solved this problem. No rocket science necessary. So in the short term, this simple box was like a double oven. Of course, in the long run, the 10811 thermal gain is only 1000 or so and you can see the effect of the HVAC shutting down at 7PM, etc.
That's interesting, Rick. I was also thinking that just still air was most of the battle, but since I have the opportunity to do it "right" within reason and this is a fairly major project, I thought that adding some additional thermal isolation couldn't hurt, so why not? (time-nuttery, etc.)
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