[Today’s run: Limerock road – 4 miles]
I have now collected 8+ days of data using the FTS-4060 as my frequency standard, the Racal-1992 counter and my new little GPIB USB dongle. I had one data point that was a wild outlier and I edited that. (If someone wants the original data I could supply it.)
Here are pictures from the TimeLab program screens.
I am happy with these results. Before I started this I was able to recreate the standard deviation calculation which VE2ZAZ is using in his Windows program and add that to the logging that I am doing on my little linux box. I wanted to see if that figure was a useful handle for saying how “good” the GPSDO is doing. I think this data shows a correlation, at least enough for my needs. I wanted something to tell me if my GPSDO was “ok” or whether it was faulty. I see that the standard deviation calculation seems to fit the bill alright. I wanted to be able to make a statement like: When I ask this thing for 10 MHz, it gives me 10 MHz within a confidence window of +/- X Hertz. The number I’m seeing is X=0.003. Even that statement probably has errors because I don’t understand the statistics and what they really mean.
My data gathering is still going on. But I am thinking I want to get back to using my radios and do some more ham-radio type stuff. So I may disconnect this do a bit of reorganizing in the hamshack/evil-scientist/timelord lab.