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OMA time mark transmitter |
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| Year of manufacture: | cca. 1958 |
| Manufacturer: | Tesla Prague-Hloubětín, ČS spoje (Czechoslovak Telecommunications) - Poděbrady laboratories |
| Transmitting frequency: | 50 kHz |
| Output power: | 50 W |
| Description: |
This is a special long-wave transmitter of a time mark signal, which was built using an old KUV3/B short-wave transmitter. It was placed in Poděbrady and its 50 kHz signal served as a backup in case of a failure of the main transmitter in Liblice near Český Brod, which had 35 to 50 kW output power. The regular time mark transmission has begun in 1958 and Czechoslovakia was the first country to have a long-wave time mark signal. The marks were used to synchronize time measurement in TV and radio studios, telephone exchanges, hospitals, astronomical observatories and various factories. No receivers for domestic use were produced, but it was possible to build them at home. The time signal was also used by the Elektročas (Electric Time) company in its master clock systems. The transmission was shut down in 1995 because of the complexity of the receivers and lack of interest of clock manufacturers. It was replaced by the DCF signal broadcast from Mainflingen, approx. 25 km far from Frankfurt am Main, which continues to transmit the signal up till today.
Cesium atomic clock was used as the source of the time signal. The clock is placed in the Institute of Photonics and Electronics of the Czech Academy of Sciences and is still running. |
