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         <title>The Use of National Bureau of Standards High Frequency Broadcasts for Time and Frequency Calibrations</title>
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         <topic>Time</topic>
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    <abstract>Methods to determine time or frequency by reception of NBS high frequency radio broadcasts are discussed. Results are shown for calibration of time signals to within plus or minus 100 microseconds and calibration of frequency offset with a resolution of better than 1 part in 10 to the 9th power. These results are achieved by using a systematic approach and refined measurement technique.</abstract>
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              <title>NBS Technical Note 668</title>
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