Regarding the improved integrator A9 in the 5065A Rubidium FStandard. (Series 2632) I have copied some of the improvements (?)that HP made to the 5065. The A7 AC-Amplifierand the A9 Integrator. Regarding the A9 Integrator: I noticed that there is nothing that prevents the [-EFC] signal from going positive in the improved OPA111 design. If the XO in the 5065A is an old 00105-6013, the series resistances to the varactor in the XO Assembly amounts to ~70 kOhms which should prevent the varactor CR1 from forward current destruction. In the 10811-version I can see 100 kOhms. How does these oscillators behave should the -EFC signal swing the full +/- 15V that the OPA111 is capable of? Does it stop oscillating?
Will 15V reverse polarity destroy the varactors? I have added two zener diodes to the output after R3 (21K5) in my design which will prevent the [-EFC] from exceeding +/- 5V but the question is if the diodes needs to be populated or not. Comments Invited. Ulf Kylenfall SM6GXV _______________________________________________ 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.
