Paul wrote:
Can you mention the size of the aluminum box you are using to add thermal capacitance?
It depends on the size of the oscillator -- as a general rule, I'd leave at least 3-4 cm of air space on all 6 sides of the oscillator. The cast aluminum boxes I use have wall thicknesses from 1.6 mm to 4 mm.
Warren pointed out that the MV89 has a double oven and said that this makes added thermal capacitance unnecessary. He seems to have had better luck with MV89s than I have. I did not find that the three I tried had significantly less sensitivity to fast ambient temperature changes than a number of single-oven oscillators in my collection. In my experience, and from the many posts to this list and elsewhere, it is obvious that the quality of brand new MV89s varies all over the place and, additionally, that many of the ones available used on the surplus market are broken.
Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
