Didier Juges wrote:
> The designers of the HP E1938 (which never went to full production) went > through pains to try and keep the gradient evenly distributed precisely for > that reason. My guess is that it you take the cover out from the E1938, you > will find a perfectly symmetrical layout around the center, where the > thermistor is located. Actually, something like 30,000 E1938A's were built. Maybe the glass is not full, but it is not exactly empty. As I explained in my 1997 FCS paper, the oven is very symmetrical, etc. We routinely achieved a thermal gain of several 100,000. During design testing, we could often get the thermal gain up to well over 1 million. This is the thermal gain to the crystal. Of course, the gain to the electronics was less. The thermal gain of a good 10811 is around 1,000, by comparison. Rick Karlquist N6RK E1938A designer _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
