This manifests itself in electrical detuning of the antenna resonance circuit and hence a measurable phase modulation of the received signal.
DCF77 is a German longwave time signal and standard-frequency radio station.
It started service as a standard-frequency station on 1 January 1959. Its primary and backup transmitter are located at in Mainflingen, about 25 km south-east of Frankfurt am Main, Germany.
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The transmitted data signal is repeated every minute.
Since 2003, 14 previously unused bits of the time code have been used for civil defence emergency signals.
This is an experimental service, aimed to one day replace the German network of civil defence sirens.
Since 22 November 2006 the DCF77 transmitter uses bits 1–14 to transmit warning messages and weather information.
It is operated by Media Broadcast Gmb H (previously a subsidiary of Deutsche Telekom AG), on behalf of the PTB.