Omron WD30-ME Operation Manual page 52

Deciding the Antenna Installation Position
40
The OMRON V690 microwave RF-ID system uses frequencies within the
range used by the wireless unit and so if they are used on the same floor,
observe the following points when installing.
• Separate the antennas and ID tags by at least 3m.
• Set frequencies outside the range 12CH to 30CH.
10. Direction of waves emitted from the antennas
Antennas emit waves in certain directions, and there are certain directions
in which waves are received easily. These directions are known as the "di-
rectional characteristics." The directional characteristics for pencil anten-
nas and magnet-base antennas when they are installed vertically are
donut-shaped, spreading outwards horizontally. Radio waves are emitted
in every horizontal direction but are not emitted upwards or downwards.
11. Other points about magnet-base antennas
• The magnet on the magnet-base antenna is very strong. Do not remove
the antenna by pulling on the cover or cable. Doing so may damage the
antenna. Be sure to hold the base when handling the antenna.
• Twist the cable as little as possible.
• Before mounting the antenna to the wireless unit, check that the plug
and jack are properly connected and then tighten them by twisting the
ring nut. When mounting, twist only the ring nut; do not twist the cable.
• Design the hole for passing the cable through so that the cable is pro-
tected.
Section 2-7