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Figure 3. Spectrum of the Type 1 1 13-A Standard-Frequency Oscillator as measured at 23,900 Mc by the National Bureau of Standards.

Figure 3. Spectrum of the Type 1 1 13-A Standard-Frequency Oscillator as measured at 23,900 Mc by the National Bureau of Standards.

second. Radio propagation time varies up to ±0.1 millisecond, making over-all accuracy of comparison approximately ±0.2 millisecond. A frequency calibration accuracy of +1 X 10-9 is possible over a 48-hour interval. This unit provides an additional fail-safe feature since even momentary failure of the driving frequency will stop the clock, which will not restart of itself when the drive reappears.

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