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The introduction of FM in the police radio communications system in 1950 led to the start of land mobile communications with FM radio. Just at the start of FM radio communications, JRC developed a radio device using vacuum tubes. Since then, with developments in devices and circuits, the overall sizes have become progressively smaller. At the same time, more efficient use of frequencies have made it possible for communications through narrower bands to be developed. Recently, digital systems have been introduced. This report explains technological evolution in JRC commercial use wireless devices during these years, using representative product models as examples.

Satoshi Tsuchiya
Takuya Noda
Shuichi Takahashi