Meinberg PZF511 - Manual (Page 7)

7
Installation PZF511
To achieve the technical data given in chapter 'technical specifications', the following
points must be observed.
Operating voltage
The clock operates with a single +5V supply. The output voltage should be well
regulated because drifting supply voltages reduce the short time accuracy of the genera-
ted frequencies and timing pulses. The power supply lines should have low resistance
and be connected using both pins a and c of the rear connector.
Antenna
The external ferrite antenna AW02 is connected to the receiver by using a 50 ohm coax
cable. If reception is sufficient, the length of the cable can be up to several hundred
meters without any problems. An antenna amplifier is available for very long antenna
cables.
Assembly of antenna
The antenna has to be mounted as exactly as possible. Turning it out of the main receive
direction will result in less accurate time frames. The antenna must be placed in
longitudinal direction to the DCF-transmitter (Frankfurt). The nearness to microcompu-
ters should be avoided (PZF511 included) and the antenna should be installed with a
minimum distance of 30cm to all metal objects, if possible. A distance of several meters
to TV- or computermonitors must be kept.
After switching the PZF511 to the menu 'FIELD', the adjustment of the antenna can
be executed. The displayed value is proportional to the received field strength. The best
method of mounting the antenna is to look for the minimum field strength and turn the
antenna by 90° to maximum then. A high field strength on its own is no guarantee for
good conditions of receiption, because interfering signals within the bandwidth of the
receiver also have an effect on the displayed value.
The maximum interference immunity can be found by looking at the autocorrelation
coefficient (in percent) in the menu 'PZF-STAT'. The displayed value should be close to
100% for best receiption.