La Crosse Technology Original IT Plus DCF-77 Manuel D'utilisation page 31


Display the signal reception symbol indicating that receiver is receiving
outdoor data.

Low battery indicator
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
Temperature 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 1500km radius of Frankfurt.
Once the outdoor temperature is displayed on the Temperature Station, 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:

Recommended distance to any interfering sources like computer monitors or
TV sets is a minimum of 1.5 - 2 meters.

Within ferro-concrete rooms (basements, superstructures), the received signal
is naturally weakened. In extreme cases, please place the unit close to a
window and/ or point its front or back towards the Frankfurt transmitter.
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