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An FM band expander (band converter, FM converter) is a device used on Japanese
car stereo Vehicle audio is equipment installed in a car or other vehicle to provide in-car entertainment and information for the vehicle occupants. Until the 1950s it consisted of a simple AM radio. Additions since then have included FM radio (1952), ...
systems to enable them to receive international FM frequencies, when used or grey import Japanese cars are shipped to other markets. Japanese
radio band The radio spectrum is the part of the electromagnetic spectrum with frequencies from 0  Hz to 3,000  GHz (3  THz). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particular ...
s are between 76 and 90 MHz whereas the international broadcast plan is between 87.5 and 108 MHz.{{cite web , url=https://www.rsm.govt.nz/business-individuals/interference/band-expanders-in-imported-vehicles/ , title=Band expanders in imported vehicles , publisher=Radio Spectrum Management The unit itself is connected inline between the
radio Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300  gigahertz (GHz). They are generated by an electronic device called a transm ...
and the antenna, and it downshifts the frequency of the broadcast by a predetermined amount (generally between 10 and 14 MHz).


Power

FMBE is powered from the ACC line that is also connected to the stereo unit so it is only operational when the radio is active. Because the Japanese broadcast band width has a narrower range than the international standard, the unit may have to downshift the same frequencies by 10 and 20 MHz simultaneously. This is to ensure both 'sets' of frequencies get included in the reduced
bandwidth Bandwidth commonly refers to: * Bandwidth (signal processing) or ''analog bandwidth'', ''frequency bandwidth'', or ''radio bandwidth'', a measure of the width of a frequency range * Bandwidth (computing), the rate of data transfer, bit rate or thr ...
, but it can mean that some
stations Station may refer to: Agriculture * Station (Australian agriculture), a large Australian landholding used for livestock production * Station (New Zealand agriculture), a large New Zealand farm used for grazing by sheep and cattle ** Cattle statio ...
can become doubled up.


References

In-car entertainment