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The sources of radiated EMI can be broadly classified into three types:
1) Hand-held portable transceivers (transmitters-receivers) with the
antenna mounted directly on the transmitting unit. Examples include:
citizens band (CB) radios, “walkie talkie,” security, fire, and police
transceivers, cellular telephones, and other personal communication
devices. **Note: Some cellular telephones and similar devices
transmit signals while they are ON, even when not being used.
2) Medium-range mobile transceivers, such as those used in police
cars, fire trucks, ambulances, and taxis. These usually have 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: Other types of hand-held devices, such as cordless phones,
laptop computers, AM/FM radios, TV sets, CD players, and cassette
players, and small appliances, such as electric shavers and hair dryers,
so far as we know, are not likely to cause EMI problems to your
powered wheelchair.
Powered Scooter Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense as one
moves closer to the transmitting antenna (source), the EM fields from
Hand-held radio wave sources (transceivers) are of special concern. It
is possible to unintentionally bring high levels of EM energy very
close to the powered scooter’s control system while using these
devices. This can affect powered scooter movement and braking.
Therefore, the warnings listed below are recommended to prevent
possible interference with the control system of the powered scooter.
WARNINGS
Electromagnetic
interference
(EMI) from sources such as
radio and TV stations, amateur radio (HAM) transmitters, two-way
radios, and cellular phones can affect powered scooter and motorized
scooters. Following the warnings listed below should reduce the
chance of unintended brake release or powered scooter movement,
which could result in serious injury.
1) Do not operate hand-held transceivers (transmitters-receivers),
such as citizens band (CB) radios, or turn ON personal
communication devices, such as cellular phones, while the powered
scooter is turned ON.
2) Be aware of nearby transmitters, such as radio or TV stations, and
try to avoid coming close to them;
