[Today’s run: Limerock road – 4 miles]<\/p>\n
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.\u00a0 I had one data point that was a wild outlier and I edited that.\u00a0 (If someone wants the original data I could supply it.)<\/p>\n
Here are pictures from the TimeLab program screens.<\/p>\n
I am happy with these results.\u00a0\u00a0 Before I started this\u00a0 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.\u00a0 I wanted to see if that figure was a useful handle for saying how “good” the GPSDO is doing.\u00a0 I think this data shows a correlation, at least enough for my needs. \u00a0 I wanted something to tell me if my GPSDO was “ok” or whether it was faulty.\u00a0 I see that the standard deviation calculation seems to fit the bill alright.\u00a0 I wanted to be able to make a statement like:\u00a0 When I ask this thing for 10 MHz, it gives me 10 MHz within a confidence window of +\/- X Hertz.\u00a0 The number I’m seeing is X=0.003<\/em>.\u00a0 Even that statement probably has errors because I don’t understand the statistics and what they really mean.<\/p>\n My data gathering is still going on.\u00a0 But I am thinking I want to get back to using my radios and do some more ham-radio type stuff.\u00a0 So I may disconnect this do a bit of reorganizing in the hamshack\/evil-scientist\/timelord\u00a0 lab.<\/p>\n
![\"AllanDeviation\"](\"http:\/\/w0ep.us\/OM\/wp-content\/uploads\/2013\/02\/AllanDeviation-700x390.jpg\")
<\/a><\/p>\n![\"FrequencyDifference\"](\"http:\/\/w0ep.us\/OM\/wp-content\/uploads\/2013\/02\/FrequencyDifference-700x390.jpg\")
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