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, mobile telephones, and other personal communication devices;
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 transmitters (radio and TV
broadcast antenna towers) and amateur (HAM) radios.
Valour - Travel Mobility Scooter
Safety Information On Electromagnetic Interference (Emi)
www.careco.co.uk CareCo, Hubert Road, Brentwood, Essex, CM14 4JE
11
The sources of radiated EMI can be broadly classified into three types:
Some mobile telephones and similar devices transmit signals while they
are ON, even when not being used.
!
Other types of hand-held devices, such as cordless phones, laptop
computers, AM/FM radios, TV sets, CD 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 motorized scooter.
!
It is very important that you read this information regarding the possible
effects of Electromagnetic Interference on your motorized scooter.
!
Powered wheelchairs and motorized scooters may be susceptible to electromagnetic interference (EMI),
which is interfering electromagnetic energy (EM) emitted from sources such a radio stations, TV stations,
amateur radio (HAM) transmitters, two-way radios, and mobile phones. The interference (from radio wave
sources) can cause the motorized scooter to release its brakes, move by itself, or move in unintended
directions. It can also permanently damage the motorized scooter control system. The intensity of the
interfering EM energy can be measured in volts
per meter (V/m). Each motorized scooter can resist EMI up to certain intensity. This is called its “immunity
level.” The higher the immunity level, the greater the protection. At this time, current technology is
capable of achieving at least a 20 V/m immunity level, which would provide useful protection from the
more common sources of radiated EMI. This immunity level of this motorized scooter model is 20 V/m.
There are a number of sources of relatively intense electromagnetic fields in the everyday environment.
Some of these sources are obvious and easy to avoid. Others are not apparent and exposure is
unavoidable. However, we believe that by following the warnings listed below, your risk to EMI will be
minimized.