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1-second adjusted alignment amplitude AN/FPN antenna approximately atomic atomic standard attenuation broadcast Chain clock error clock synchronization component correction correlation function coverage crystal oscillator cycle daytime determined deviation distance earth epoch Equipment Delay ERROR ANALYSIS SUMMARY frequency offset frequency standard ganged phase shifter ground station groundwave Hewlett-Packard hours 30 minutes interval ionosphere Loran Loran-C LORAN-C STATION DATA Master station measurements meteor microsecond millisecond mode modulation nautical miles Navigation NBS Report NBS Technical Note NORMALIZED ORBITAL RADIUS obtained OMEGA signal operation oscillator output path length period phase detector phase difference phase error phase shifter propagation delay Propagation Errors pulse Radio random range reference refraction relative phase reset scale function side frequency skywave Slave stations stability standard time scale synchronization system timer tracking filters transmission transmitting U. S. Naval Observatory variation velocity wave waveforms WWVB WWVH WWVL zero