Meinberg FUNKUHREN DU35K, Operating Instructions Manual

Page: 9 / 20

9
Mounting the Antenna
Generally it is important to position the antenna in an optimal way. The antenna
should be aligned at a right angle to the direction of the transmitter (Frankfurt). It
should be mounted at least 30 centimeters away from the clock unit and from solid
steel. A distance of several meters is recommended to all TVs or computer monitors.
In order to get the maximum signal, the antenna should be aligned carefully. If the
antenna is installed properly and the signal from DCF77 can be received without
strong distortions, the "Modulation Dot" starts blinking exactly once per second,
corresponding to the time marks from DCF77. If this dot flashes intermediately, there
is some electrical noise around which prevents the microprocessor from decoding the
time message. So a better location for the antenna must be found. In case of correct
reception it takes up to three minutes after power-up until the clock is synchronized
and the "Free Running Dot" is turned off.
The scope of supply (only DCF77 variant) includes an active ferrite antenna for
indoor mounting (AI01) and 5m of RG175 coaxial cable. When mounting the antenna
outdoor the weather proof Antenna AW02 is to use.