OK the 10 MHz Piezo oscillator from a lucent RC/xtal pair does work and the 3801 is doing what it should.
Some insights as mentioned. 3801 DAC being full scale is not an issue when a good signal within 2 HZ is used it will come out of limit. The DAC output was driving the piezo far to widely I added a 10:1 V antennuator to reduce the swing. The piezo requires a positive only EFC and its control is inverted as compared to the HP 10811. Used a single TL071 opamp to invert the signal and apply the offset. By calculations it should have been offset to 3.6V but the system seems to want 2.5V. Pretty sure an adjustment on the actual oscillator would fix that. I can now see that something like an RB could be plugged into the 3801 etc. But more important the proof is that the actual Z3801 is fully functional and the only bad thing is a the HP 10811 oscillator. Its been a great learning exercise. How to get rid of teh outer oven. How to use far simpler power supplies to run the 3801 instead of the 48 volt mess. Overall a lower power consumption solution can be built. 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.