Most unlicensed radio stations(over 90 percent)are unlicensed citizen band radio stations, unlicensed personal radio stations, or unlicensed amateur radio stations with the following characteristics.
(1) Most are mobile, installed inside cars, and used while on the move.
(2) Unlicensed entities are forming groups to establish radio stations through more elaborate and deceptive methods.
(3) Many unlicensed radio stations are being used for business purposes.
Unlicensed citizen band radio stations that use a frequncy band between 26.1MHz and 28MHz.
Initially, CB radio equipment made to former U.S. standards in Japan as an export product were used throughout the country. More recently, however, the manufacture and use of specialized radio equipment has become increasingly popular.
In general, equipment is connected to an amplifier that increases aerial electricity line power, which disrupts and interferes with fisheries radio, television reception, telephone lines, etc.
Mostly unlicensed amateur radio stations that use a frequency band between144MHz and 146MHz, 430MHz and 440MHz, or a freqency close to these ranges.
In many cases, these radio stations operate illegally without a license and outside of assigned frequencies, with remodelled outdated or for-export amateur radio equipment. The manufacturing industry hasset up J-mark voluntary controls, in which the structure of the product makes illegal remodelling impossible.
Usually disrupts and interferes with police, fire station and train station radio.
Unlicensed personal radio stations that use a frequency band between 889MHz and 911MHz.
Almost all of these stations operate legitimate personal radio equipment that has been electronically remodeled.
Radio equipment may be remodeled to operate independently for a certain group outside of frequency bands assigned to personal radio stations, eliminating fixed channel and mute functions, etc.
Mostly disrupts and interferes with MCA, cellular phones, and disaster prevention administrative radio.