Features for DCF and TDF Antenna
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Maximum link length via shielded 2-wire cable: 100 metres
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Maximum distance from dcf (frankfurt – germany) or tdf (Allouis – france)
transmitter = 2000 km.
(this value may be smaller depending on surrounding relief and prevailing atmos-
pheric conditions)
1.3. GPS ANTENNA (CONvERTER UNIT)
Ref : 3g & 3g1 (10 meters cable included)
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install the antenna vertically, without any particular direction.
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The green indicator should flash every second, indicating the reception of at least one
gps satellite. the duration of lightningof the green indicator goes from 0 à 200 ms
according to the number of satellites received.
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The red indicator starts flashing every second as soon as the GPS system set the
time. the duration of lightning of the redindicator is a function of the bits transmitted
according to the dcf77 protocol (100ms for an «0» and 200ms for a «1», no bit at the
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second.)
th
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in some cases (before 2018) the blinking of the green led could overlap generating
an «orange» light.
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the gps code is taken into account if the number of satellites is> 2
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if after receiving the number of satellites remains <3, the dcf code is stopped after 20
seconds
MDE-ANTENNES-0085V2.5
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the antenna must be located outside and at the top of
the building, so that the reception space will be the most
significant possible.
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Any building or mound more than 5
degrees over the skyline may eclipse one or
several satellites, reducing thereby the antenna
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Although the antenna is little disrupted by
interferences of other systems, it is necessary to
avoid the settling directly under a radar.
performances.
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