La Crosse Technology WT-5120 Instruction Manual page 13

Once the outdoor reception test period is completed, the DCF tower icon in the clock
display will start flashing in the upper center. 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.
DCF reception is done twice daily at 02:00 and 03:00 am. If the reception is not
successful at 02:00 am, then the next reception takes place the next hour and so on
until 06:00am, or until the reception is successful. If the reception is not successful at
06:00 am, then the next attempt will take place the next day at 02:00 am.
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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