La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 12

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A signal reception symbol is shown indicating that Atomic time (DCF time) signal is received.
DCF-77 RADIO CONTROLLED TIME:
The time base for the radio controlled time is a Cesium Atomic Clock operated by the Physikalisch
Technische Bundesanstalt Braunschweig which has a time deviation of less than one second in one
million years. The time is coded and transmitted from Mainflingen near Frankfurt via frequency signal
DCF-77 (77.5 kHz) and has a transmitting range of approximately 1,500 km. Your radio-controlled
Weather station receives this signal and converts it to show the precise time in summer or wintertime. The
quality of the reception depends greatly on the geographic location. In normal cases, there should be no
reception problems within a 1,500 km radius around Frankfurt.
Once the outdoor temperature is displayed on the Weather station after initial set-up, the DCF tower icon
in the clock display will start flashing in the upper left corner. This indicates that the clock has detected
that there is a radio signal present and is trying to receive it. When the time code is received, the DCF
tower becomes permanently lit and the time will be displayed.
If the tower icon flashes, but does not set the time or the DCF tower does not appear at all, then please
take note of the following:
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Recommended distance to any interfering sources like computer monitors or TV sets is a minimum
of 1.5 - 2 metres.
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