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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 vehicle's 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 chance of unintended brake release or powered vehicle movement, which could result

in serious injury.