National time and frequency standards of Finland

Details National time and frequency standards of Finland National time and frequency standards of Finland

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979rasc...14..677k&link_type=abstract

(International Union of Radio Science, Open Symposium on Time and Frequency, 1st, Helsinki, Finland, Aug. 1-4, 1978.) Radio Scie

Other

Finland, Frequency Standards, Loran C, Synchronism, Time Measurement, Clocks, Crystal Oscillators, Phase Locked Systems, Television Systems

Scientific paper

The paper considers the Loran-C phase-locked clocks used in Finland for the national time and frequency standards. The ten clocks use a high-stability crystal oscillator, a Loran-C receiver, and a digital phase controller whose time constant is about 1 hour, which damps the short-term fluctuations of the receiver phase. The advantages of the clocks over cesium types, including cost and no regular adjustment requirements, are listed, noting that comparisons with rubidium and cesium clocks and other time transmissions showed that measurements of the reception of Soviet TV (Tallin) synchronization pulses showed a standard deviation of 0.1 microsec, and the day to day variation of about 0.5 microsec.

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