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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.
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 transmit signal 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
transmitter (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 player, 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 vehicle.
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 very closer to the powered vehicles control system
while using these devices. This can affect powered vehicle movement and
braking. Therefore, the warnings listed below are recommended to prevent
possible interference with the control system of the powered vehicle.
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 wheelchair. Following the warnings listed
below should reduce the
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