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TV stations, amateur radio (HAM) transmitters, two-way radios, and cellular phones.
The interference (from radio wave sources) can cause the powered vehicle to release
its brakes, move by itself, or move in unintended directions. It can also permanently
damage the powered vehicle's control system. The intensity of the interfering EM
energy can be measured in volts per meter (V/m). Each powered vehicle can resist
EMI up to certain intensity. This amount of resistance is called its immunity level.
The higher the immunity level, the greater the protection. At this time, current
technology is capable of achieving at least a 20 V/m immunity level, which would
provide useful protection from the more common sources of radiated EMI. This
powered vehicle model, with no further modification, has an immunity level of 20 V/m
without any accessories.
There are a number of sources of relatively intense electromagnetic fields in our
everyday environment. Some of these sources are obvious and easy to avoid. Others
are not apparent and exposure could be unavoidable. However, we believe that by
following the warnings listed below, your risk to EMI can be greatly minimized.
The sources of radiated EMI can be broadly classified into three types:
1. Hand-held portable transceivers (transmitter-receivers) with the antenna mounted
directly on the transmitting unit, such as citizens band (CB) radios, walkie-talkies,
security and fire or police transceivers, cellular telephones and other personal
communication devices;
2. Medium-range mobile transceivers used in police cars, fire trucks, ambulances
and taxis usually having the antenna mounted on the outside of the vehicle; and
3. Long-range transmitters and transceivers, such as commercial broadcast
transmitters (radio and TV broadcast antenna towers) and amateur (HAM) radios.
NOTE:
Some cellular telephones or similar devices transmit signals while they are ON, even
though they are not in use.