Omron WT30-CA2M Operation Manual page 35

Installation
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6. Separate different sets of Antennas as much as possible.
If different sets of Antennas are close to each other, they will influence
each other and thereby influence wireless communications, causing an in-
crease in the number of retries, and a reduction in the possible communi-
cations distance. Separate different sets of Antennas by at least 2 m if
possible.
7. Do not install the two Magnet-base Antennas close to each other.
If the two Antennas are close to each other, the diversity effect will not be
utilized. Magnet-mounting allows the positions to be adjusted easily. If pos-
sible, separate the Antennas by an even greater distance.
8. Install the Antennas with the same orientation.
Install Antennas that are performing communications with the same orien-
tation, as shown in the following diagram. Install Flat Diversity Antennas in
the same way. If they are installed at an angle of 90 ° to each other, the pos-
sible communications distance will be shortened.
9. Separate the Antennas from ID Tags by at least 3 m.
The OMRON V690 Microwave RFID System uses frequencies within the
range used by the WT30 Terminals. Therefore, if the two systems are used
on the same floor, observe the following points when installing the sys-
tems.
• Separate the Antennas and ID Tags by at least 3 m.
• Set the frequency to a channel other than channels 12 to 30 or chan-
nels 62 to 79.
10. Direction of Waves Emitted from Magnet-base 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.
Radio wave emissions from the tip of the Antenna are low, so the commu-
nications distance will be shortened if the tips of the Antennas for both the
WT30 Terminals are installed facing each other.
Section 2-1