[time-nuts] How good is my T-bolt...??

Predrag Dukic stijena at tapko.de
Sun Dec 21 14:23:13 UTC 2008



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
>
>
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