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3.2 The sources of radiated EMI can be broadly classified into three types.
3.2.1 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;
NOTE:
Some cellular telephones or similar devices transmit signals while they are ON, even
though they are not in use.
3.2.2 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
3.2.3 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 (cordless phones, laptop computers, AM/FM radios,
TV sets, CD players, cassette players, and small appliances such as electric shavers
and hair dryers, et cetera) so far as we know, are not likely to cause EMI problems.
3.3 Powered Vehicle 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 too close to the powered vehicle's control system while using
these devices. This can affect your powered vehicle's movement and braking.
Therefore, the warnings listed below are recommended to prevent possible
interference with the control system of the powered vehicle.
3.4 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 vehicles and motorized wheelchairs.
Following the warnings listed below should reduce the chance of unintended brake
