The types of equipment that may be adversely affected is nearly endless, including desk-top computers, point-of-sale terminals, gas pumps, vehicle control systems, computer systems and other portable electronics, to name just a very few. Contrast this proximity with the several meters or more of separation typical in the days before the use of portable devices with transmitters became so prevalent. The separation distance is often uncontrolled with separations of a few centimeters not being uncommon. Not only are more transmitting devices in use in all environments, the separation between any given transmitter and equipment that may be affected is generally decreasing. An unintended side effect of the proliferation of transmitting devices, however, is the increased potential for malfunctions of electronic equipment in operation close to where the transmitters are used. The benefits of these devices are quite significant. No doubt, the great expansion of this technology has improved society in many ways.
Table 1: A sampling of transmission systems
(The experienced EMC professional can probably imagine the challenge this practice creates during an RF emission test!)Ī sampling of transmission systems is shown in Table 1. We even see active RFID tags imbedded in electronic equipment undergoing EMC testing. RFID tags and transponders are used for inventory in retail stores, monitoring the location of equipment of all kinds and tracking patients in medical settings.
Other than the Boundary Waters Canoe Area Wilderness and the inner canyon of the Grand Canyon, it may be difficult to find any location without WiFi available. Smart phones, tablets and similar devices provide the ability for users to be connected to the internet any time, from any location using nearly any device.
Intentional RF transmitting devices seem to be everywhere.
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