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EMC Part: 19289500 •Rev. 01 •03/06/03
EMI WARNING
Electromagnetic Interference (EMI) From Radio Wave Sources
Powered motorized electric vehicles may be susceptible to electromagnetic interference (EMI), which is 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 powered vehicle to release
its brakes, move by itself or move in unintended directions. It can permanently damage the powered vehicle control
system.
The source of radiated EMI can be broadly classified into three types.
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.
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.
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, are not likely to cause 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 sources (transceivers) are of special concern. It is possible to unintentionally bring high levels
of EM energy very close to the powered vehicle 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
The following warnings listed below should reduce the chance of unintended brake release or powered vehicle
movement, which could result in serious injury.
•Do not operate hand-held transceivers (transmitters-receivers), such as citizen band (CB) radios, or turn ON
personal communication devices, such as cellular phones, while the powered vehicle is turned ON.
•Be aware of nearby transmitters, such as radio or TV stations, and try to avoid coming close to them.
•If unintended movement or brake release occurs, turn the powered vehicle OFF as soon as it is safe.
•Be aware that adding accessories or components, or modifying the powered vehicle, may make it more
susceptible to EMI (NOTE: There is no easy way to evaluate the overall immunity of the powered vehicle).
Report all incidents of unintended movement or braking to UltraLite Vehicles, and note whether there are sources of EMI
nearby.