Mobile radio sets on 152–174 Megacycles

THE RAPID GROWTH of the relatively new 152–174 megacycle band has resulted in complete utilization of all available channels which were assigned alternate 60 kc by July 1949; then the Federal Communications Commission (FCC) suggested assignments every 60 kc. The problems resulting from this ruling were: the adjacent channel selectivity required; the intermodulation products caused in the land and mobile receivers by three or more transmitters operating in the same area; the design of mobile transmitters to meet the FCC requirements regarding spurious radiation; and the modulation limiter to prevent the transmitter from overmodulating.