[time-nuts] Comparing the frequency of two gpsdo's.

Mark Spencer mspencer12345 at yahoo.ca
Sat Nov 13 16:18:30 UTC 2010


Hello:

I'm looking for some advice about ways I can compare the frequency of two gpsdo's.  To date I have been using an oscilloscope that supports phase measurements to measure the small (typically 10 degreees or so at 10 mhz) change in phase between the two signals over a period of a few hours and then calculating the frequency change.

I realize this is sub optimal but I wanted to use the gear on hand.   Recently the phase measurement fuction of my scope has stopped working.  

As the useage I have ever found for the phase measurement function in my scope was comparing the frequencies between gpsdo's I'm thinking it might be better to invest in some other equipment rather then getting the scope fixed.

Any thoughts as to what could be obtained used for less than 1K that would be suited for this type of measurement ?

Regards

Mark S





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