ADE CK 1703 Mode D'emploi page 34

If a sufficiently strong signal has not been
received, the radio-controlled alarm clock will
cancel the receiving process after a few minutes
and the radio tower symbol goes out.
The receiving process is started again at a later
point in time. In this case, the time proceeds as
usual (beginning with the start time of "00:00").
Checklist when data is missing in the
display
1. Check whether the location of the alarm
clock is suitable, see "Choosing a location".
2. Manually restart the receiving process, see
"Starting signal reception manually".
3. Wait until the alarm clock automatically
switches back to receiving mode at a later
time.
4. Manually perform settings if reception is
not possible at your location, see "Setting
the time manually".
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DCF Radio-controlled alarm clock CK 1703