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7
EMI Warning
Low Cost Mobility
scooters may be susceptible to electromagnetic interference (EMI), which is a kind
of interfering electromagnetic energy (EM) emitted from sources such as radio stations, TV stations,
amateur radio (HAM) transmitters, two-way radio, and cellular phones. The interference (from radio
wave sources) can cause the scooter to release its brakes, move by itself, or move in unintended directions.
It can also permanently damage the scooter’s control system.
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.
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 problems to the scooter.
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 sources (transceivers) are of special concern. It is possible to
unintentionally bring high levels of EM energy very close to the scooter’s control system while using
these devices. This can affect scooter movement and braking. Therefore, the warnings listed below are
recommended to prevent possible interference with the control system of the scooter.