If I still have it, I'll take a picture of the 1992 i salvaged the keyboard from. I was told it had 2 KW @ 700 MHz applied to it.
They do not make very good dummy loads. -pete On Tue, Dec 20, 2011 at 11:31 AM, Don Latham <d...@montana.com> wrote: > Ah. That seems right, Charles, going by the behavior. In that case, what > and where is the reference for the heater servo? The ambient > temperature? Not too wise a choice, but what else? So it may be that the > temperature is the controlling element but it, too, is an open system? > It can be open, too, just second order? > This is a knotty one! > Don > Charles P. Steinmetz >> Don wrote: >> >>>This is typical for an underdamped second order servo. The oscillation >>>is the penalty for a shorter settling time. A critically damped system >>>would not oscillate, but approach the final value smoothly in a >>> slightly >>>longer time. It may have been designed for a slight overshoot... >> >> Yes, I understand and I don't doubt that it is performing as >> designed. My point was that most crystal oscillator frequency >> adjustments (at least, the ones that I have seen) are open-loop >> (variable capacitor or pot to a varactor diode). Finding the fine >> frequency control apparently in a servo loop was a surprise. And it >> cannot be a PLL or FLL, because there is only the one reference -- >> the one you are adjusting. Since the startup dynamics are so similar >> to the fine frequency adjustment dynamics (not to mention that the >> oven loop is pretty much the only possible servo in the oscillator), >> the evidence appears strong that the fine frequency adjustment is an >> oven temperature adjustment. Unless there is something truly >> diabolical going on inside a 9462. >> >> Best regards, >> >> Charles >> >> >> >> >> >> >> _______________________________________________ >> 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. >> > > > -- > "Neither the voice of authority nor the weight of reason and argument > are as significant as experiment, for thence comes quiet to the mind." > R. Bacon > "If you don't know what it is, don't poke it." > Ghost in the Shell > > > Dr. Don Latham AJ7LL > Six Mile Systems LLP > 17850 Six Mile Road > POB 134 > Huson, MT, 59846 > VOX 406-626-4304 > www.lightningforensics.com > www.sixmilesystems.com > > > > _______________________________________________ > 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. _______________________________________________ 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.
