FM broadcast band: Encyclopedia II - FM broadcast band - Japanese bandplan

FM broadcast band - Japanese bandplan

The FM band in Japan is 76-90MHz. The narrowness of the Japanese band (16 MHz compared to slightly more than 20 MHz for the CCIR band) limits the number of FM stations that can be accommodated on the dial with the result that many commercial radio stations are forced to use AM.

Many Japanese radios are designed to be capable of receiving both the Japanese FM band and the CCIR FM band, so that the same model can be sold within Japan or exported. The radio may cover 76 to 108 MHz, the frequency coverage may be selectable by the user, or during assembly the radio may be set to operate on one band by means of a specially-placed diode or other internal component.

Second-hand automobiles imported from Japan contain a radio designed for the Japanese FM band, and importers often fit a "converter" to down-convert the 87.5 to 107.9 MHz band to the frequencies that the radio can accept. In addition to showing an incorrect frequency, there are two other disadvantages that can result in poor reception; the converter "compresses" the frequencies making the stations appear closer together, and the original antenna may perform poorly on the higher FM band. A better solution is to replace the radio and antenna with ones designed for the country where the car will be used.

Adapted from the Wikipedia article "Japanese bandplan", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki