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1.6 Connection of DCF receiver
The DCF77 antenna needs to be plugged into the terminal with the label +DCF-.
Before attaching the antenna the MPU-TC must be taken from main supply, the
polarity of the Mattig-Schauer DCF77 Antenna does not need to be considered.
After powering the MPU-TC again, the signal quality can be checked with the
antenna symbol on the MPU-TC display, the control LED on the base cuircuit board
or the LED on the DCF antenna. All of those indications should blink in a one second
cycle.
If the LEDs blink aperiodic or permanent, then the antenna needs to be positioned
differently. To improve reception conditions please change position of the DCF
antenna as long as necessary. The DCF antenna should be mounted in a 90° angle
to the direction of Mainflingen near Frankfurt/Germany.
In case the signal reception is interfered by means of the shape or material of the
building (reinforced concrete) or due to the surroundings (high buildings, cranes, etc)
the DCF antenna should be mounted externally (facade or roof). The maximum
distance with shielded cable can be 200m.
In other cases the MPU-TC master clock can also be synchronised by GPS antenna
with output of DCF signal.
If the BMC is operated together with the Network Module, it can be synchronized to a
Network Time Server (NTP). In this case antenna input is ignored. For more details
can be found in the user manual of the Network Module.
