Meinberg VP100 20 - Manual (Page 8)

8
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 "Modulation 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. If an outdoor mounting of
the antenna is necessary, the weather proof variant AW02 is to use.
Usage of the Buttons MENU and SET
The time, the language, the brightness and the automatic changeover of daylight
saving can be edited by using the buttons MENU and SET.
The button MENU is used to change over from the normal operation mode into the
'set parameters' mode and to select the different menus. The button SET is used to
modify the selected menu. When leaving the menu by pushing MENU the modificati-
on is acknowledged. When no button is pushed for more than 30 seconds the VP100/
20 goes back into normal operation mode with loosing the last modification that was
not acknowledged. The menus in detail are described below.