I built a GPSDO using my own power supply, a VE2ZAZ board, a Trimble Resolution T GPS and a surplus HP 10811 oscillator.
I'm having a bit of trouble with it. I have it set up and it locks ok and stays in lock so far. But the recommended long-term integration setting is not working for me. I think it is about 3 hours. At the end of every cycle it does a control voltage adjustment, always in one direction. If I understand it right, the oscillator is slowing and needs an incremental bump downward of control voltage every time. That seems like it is more than just long term drift. But I don't have my head around the quantities I'm looking at. I can measure the control voltage change over time. Can I convert that into a frequency drift? Or do I need to stop the voltage adjustments and allow the drift to occur then do a measurement of that directly somehow? Is this type of behavior an indication of dire problems with my 10811 oscillator? Chris Howard w0ep _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
