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TFA 30.3039.IT Manual

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33
In case the clock cannot detect the DCF-signal (for example due to
disturbances, transmitting distance, etc.), the time can be set
manually.
The clock will then work as a normal quartz clock. (see: Basic
settings/Time and calendar).
The radio controlled clock receives the signals at 2:00 and 3:00
o'clock in the morning.
As soon as the clock has received the DCF signal, the manually
set time will be overwritten by the DCF time.
Note that during reception of the radio-controlled clock signal, no
communication with the USB wireless transceiver is possible or
may be briefly interrupted.
Note for Radio Controlled Time DCF:
The base for the radio controlled time is a Caesium 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 1500 km. Your Logger 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.
Recommended distance to any interfering sources like computer
monitors or TV sets is a minimum of 1.5 - 2 metres.
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 night-time, 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.
… 34 …


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