One of the things that cannot be ignored are the statements made in item #10 regarding the DAC and OCXO EFC. If the DAC is 16 bits that is 2^16=65,536 steps. If the DAC outputs 0-4 volts that is 61uV/step.
Now you have to take this number and multiply it by your OCXO sensitivity (not given), and you have the minimum frequency step that can be made. This is the best that you can ever do. So, your TIC/1pps resolution does not need to be any better than this. Waiting a long time to get higher resolution may (probably) buys you nothing. This is where all the magic comes in - higher resolution DACs, more stable oscillators, more stable GPS PPS, etc. To a first order, overlaying the line from item #6 with the ADEV of the oscillator used and setting the loop time constant at the crossover tau works pretty good. As has been said many times, if it was easy everybody would be doing it. Regards, Skip Withrow _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
