21
not be more than 100 meters (see notes on “Positioning” and “868
MHz Reception”).
IMPORTANT:
Transmission problems will arise if the setting for additional sensors is not
followed as described above. Should transmission problems occur, it is
necessary to remove the batteries from all units and start again the set-up
from step 1.
RESETTING
The Weather Station and the Temperature transmitter need to be reset
when one of the following conditions occur:
•
Unsuccessful 868MHz signal reception.
•
Malfunction on the units.
•
Batteries replacement.
For resetting, remove all batteries from the units. Wait at least for 1 minute
before powering up the Weather Station again. Proceed from step 1 in
“Setting Up”.
DCF 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 1500km
radius of Frankfurt.
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 occurs twice daily at 02:00 and 03:00 am. If the reception
is not successful at 03:00 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.
• During nighttime, the atmospheric disturbances are usually less
severe and reception is possible in most cases. A single daily
reception is adequate to keep the accuracy deviation below 1
second.
FUNCTION KEYS:
Weather Station:
The Weather Station has 4 easy to use function keys:
