Hello, Time-Nutters-- Bruce said: > A statement of accuracy is of little value unless you also give: > 1) An estimate of the accuracy of standard used for comparison. > 2) An estimate of the random and systematic errors in the comparison > 3) Some details of the comparison method. > 4) Averaging time and other pertinent info. ------------------------------ Mike asked: > What frequency reference did they use at the university standards lab to measure the T-Bolt frequency? And how did they measure its frequency? > How did they do the comparison to your TBolt? If it was a counter, what kind was it? > You mentioned the error was better than 1e-12 90% of the time. What was the average error? ------------------------------ Hi, Bruce, Mike, et al-- Your points are all well taken! However, all I wanted to know (and all I asked the standards lab) was: How much "ballpark" error will I have when using my T-bolt as a reference to confirm the frequency of my 10GHz ham transmitter? Yes, from a Time-Nuts perspective, my question is crude and unsophisticated, but I simply did not have any interest in knowing anything about the T-bolt except how good it is when used as a reference for checking the frequency output of my 10GHz transmitter. I really did not care about ADEV, MDEV, XYZDEV or any other alphabet soup criteria, and yes, I know that this confirms that I am a primitive knuckle-dragging troglodyte with respect to the subtle nuances of time and frequency standards... It's kinda like looking at the speedometer on my pickup truck as I drive down the Interstate highway....: My only interest is that it be accurate enough to use for my particular application. Same goes for my T-bolt... Can I trust it to get me within 10Hz at 10GHz? +/- 100Hz? +/- 1KHz? As for what the lab used to make the measurements, all I can say is that the lab has several time/frequency references, one I saw was about the size of a refrigerator called a CH1-75 Active Hydrogen Maser. Big-- looked expensive, blinking lights, pretty colors... impressed me. I'll go back to my cave, now... Cheers!! Mike Baker WA4HFR Gainesville, Florida, USA

Mike, Thunderbolt is going to bring You from NY to SF at exactly 55MPH AVERAGE, down to the fraction of the INPH, and still there is a possibility that You earn a speeding ticket or two (or more) on the way. Predrag Dukic (also not an expert, but things are not that simple as Your question) At 15:09 21.12.2008, you wrote: >Hello, Time-Nutters-- > >Bruce said: > > > A statement of accuracy is of little value unless you also give: > > 1) An estimate of the accuracy of standard used for comparison. > > 2) An estimate of the random and systematic errors in the comparison > > 3) Some details of the comparison method. > > 4) Averaging time and other pertinent info. >------------------------------ > >Mike asked: > > > What frequency reference did they use at the university standards > lab to measure the T-Bolt frequency? And how did they measure its > frequency? > > > How did they do the comparison to your TBolt? If it was a counter, > what kind was it? > > > You mentioned the error was better than 1e-12 90% of the time. What > was the average error? >------------------------------ > > >Hi, Bruce, Mike, et al-- > >Your points are all well taken! However, all I wanted to >know (and all I asked the standards lab) was: How much >"ballpark" error will I have when using my T-bolt as a >reference to confirm the frequency of my 10GHz ham transmitter? >Yes, from a Time-Nuts perspective, my question is crude and >unsophisticated, but I simply did not have any interest in >knowing anything about the T-bolt except how good it is when >used as a reference for checking the frequency output of my >10GHz transmitter. I really did not care about ADEV, MDEV, >XYZDEV or any other alphabet soup criteria, and yes, I know >that this confirms that I am a primitive knuckle-dragging >troglodyte with respect to the subtle nuances of time and >frequency standards... > >It's kinda like looking at the speedometer on my pickup truck >as I drive down the Interstate highway....: My only interest >is that it be accurate enough to use for my particular >application. Same goes for my T-bolt... Can I trust it >to get me within 10Hz at 10GHz? +/- 100Hz? +/- 1KHz? > >As for what the lab used to make the measurements, all I can >say is that the lab has several time/frequency references, >one I saw was about the size of a refrigerator called a >CH1-75 Active Hydrogen Maser. Big-- looked expensive, >blinking lights, pretty colors... impressed me. > >I'll go back to my cave, now... > >Cheers!! > >Mike Baker >WA4HFR >Gainesville, Florida, USA > > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there.