Hi Crystals do indeed fail. In the case of 40 Hz low, I’d look for a shorted cap in series with the crystal.
Bob > On Dec 14, 2016, at 5:23 PM, paul swed <paulsw...@gmail.com> wrote: > > I have a hp z3801 that is spare parts it never worked correctly. Did some > digging and at least one major issue is the actually HP 10811 is 38 Hz low. > It needs to be within a Hz. Checked everything feeding voltage and such and > they are solid at 5.7V from the regulator. The varicap works as expected. > Signal levels out are clean and correct. Temp is about 82C also inline. > The oscillator is actually fairly simple. Do xtals just fail after many > years? > May see if I can map a Piezo oven oscillator into the z3801 just to see > what if anything happens. Now that I know the warm oven signal drops fromm > 22V to 3.8V when hot. Fake it out. > Not sure the outer oven actually matters on the z3801. But even that can > actually be hooked up to make any circuit that might want to know thats it > hot happy. > Regards > Paul > WB8TSL > _______________________________________________ > 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.