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Wireless Data Communication System - WD PRO Series Instruction Manual
6. Installation
6.2.2 About the Influence of Surrounding Radio Waves
If the WD wireless network is affected by radio interference from electronics, microwave ovens, or other
manufacturing equipment, normal operation may not be possible. Check the radio wave environment before
installation and confirm there is no radio interference on the wireless radio bands you are planning to use.
Causes of Radio Interference
Description
Other wireless devices
Wireless devices using the same frequency or frequencies in
the same neighborhood.
Noise from other equipment
Noise caused by power supply circuits, electronic circuits, or
oscillators.
Noise from the surroundings
・
Noise from motors and engine equipment
・
Noise from transmission lines, power supply equipment,
and industrial equipment.
・
Noise from microwave ovens and fluorescent lamps.
Surrounding obstacles*
Interference caused by phasing with own radio waves.
*Various obstacles (wall, floor, ceiling, pillar, equipment) may exist in the installation environment. The reception of radio
waves changes depending on the relationship between the position of each device (WDR, WDT), obstacles, and the
surrounding environment. As shown in the figure below, radio waves transmitted from a single point are delivered to each
device (WDR, WDT) from multiple directions, such as when radio waves travel in a direct line, and when radio waves
reflect off obstacles. Radio wave interference could be caused by this scenario, and operation may not be possible due to
canceling radio waves.
When wireless LAN and in-house PHS access points are installed in the surrounding environment, install WDR so
they are 5 to 10 m or more away from access points.
Obstacles (wall, floor, ceiling, pillar, building)
WDT
WDR
Direct
Reflection
Reflection
Receive
Direct Wave
Reflected Wave
(Opposite phase)
Received Wave
+
The two radio waves cancel each other out
