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9Shuttle
III. EMI/RFI
EMI/RFI WARNINGS
Laboratory tests performed by the Food and Drug Administration (FDA) have shown that radio waves can
cause unintended motion of electric scooters. Radio waves are a form of electromagnetic energy (EM).
When electromagnetic energy adversely affects the operation of an electrical device, that adverse effect is
called Electromagnetic Interference (EMI) or Radio Frequency Interference (RFI).
EMI/RFI FREQUENTLY ASKED QUESTIONS (FAQS)
The following FAQs summarize what you should know about EMI/RFI. Use this information to minimize
the risk that EMI/RFI will adversely affect your Shuttle.
Where do radio waves come from?
Radio waves are emitted from the antennas of cellular phones, mobile two-way radios (such as walkie-
talkies and CBs), radio stations, TV stations, amateur radio (HAM) transmitters, wireless computer links,
microwave sources, and paging transmitters. Radio waves are a form of electromagnetic energy (EM).
Because EM is more intense closer to transmitting antennas (sources of emission), the EM fields from two-
way radios are of special concern to electric scooter users.
If EMI/RFI affects my Shuttle, what kind of motion should I expect?
The motion of any electric scooter affected by EMI/RFI can be erratic. The scooter may come to a sudden
stop or move in an uncontrolled manner. Also, it is possible for EMI/RFI to release the brakes of an electric
scooter. Some intense EMI/RFI can even damage the control system components of an electric scooter.
Is there any way to know for certain whether or not radio waves are the cause of any unintended
motion of my Shuttle?
Unfortunately, EMI/RFI may be difficult to recognize, since the signals from radio sources are invisible and
may be intermittent. However, the FDA recommends that you report all incidents of unintended motion or
unintended brake release of your electric scooter to the scooters manufacturer and, if possible, determine
whether or not there was a radio wave source nearby at the time of the incident.
One precaution you can take against inadvertent motion of your Shuttle is to make certain that you or
someone else is not the cause of the unintended motion.
n Turn off your Shuttle by removing the key from the key switch when you are getting on or off of your Shuttle.
n Never leave the key in the key switch of an unattended Shuttle.
By following these steps, you greatly reduce the risk of you or anyone else inadvertently bumping the
throttle control levers and causing the Shuttle to move unintentionally.
Are all electric scooters susceptible to EMI/RFI?
Each make and model of electric scooter differs in its ability to resist EMI/RFI. That is, each scooter has a
particular level of resistance to EMI/RFI. This resistance is measured in volts per meter (V/m). A higher
resistance level offers greater protection against EMI/RFI. In other words, an electric scooter with a high
resistance level is less likely to be affected by a strong radio source than is an electric scooter with a low
resistance level.