>Wonder how the Z3816A would like a modified VP inside... Hmmm... a closed >loop system, what are really the timeconstants relevant, to make sure it >is stable?
That is where I am going. The UT+ oncore inside the Z3816A is a simple crystal and easy to feed with the 3325A. I currently have an ongoing oven turning point experiment with the MTI oscillator or I would have done it already. The frequency of the local oscillator will need to be different by 0.5 Hz I think. The pps pulse needs to jump back and forth by 1 clock cycle for the pps pulse to have any feedback information in it when the local oscillator is phase locked unless the Z3816A reads the sawtooth residual from the internal UT+. >The big difference is that Peter used another GPS clock as reference. By that >he is actually doing a delta measurement between the receivers. Hooking the >3325 up to a Cesium would be a much more interesting measurement. I have measured the stability of the Z3616A 10MHz output indirectly by measuring a good ovenized crystal oscillator in the past it is less than 50uHz rms with 10 samples of 1.8 seconds. For comparison my two rubidium oscillators are about 200 to 350 uHz rms. The HP engineers did a good job. >You would like to query the receiver in a different maner, so that would >require a modified firmware. My data logging is not what it should be. I do not know a simple way to log the sawtooth data to a file so I did a screen capture. Peter _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
