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The road to the modern wireless communications network was fraught with technical, bureaucratic, and social speed bumps. In 1905, listeners in New York City, accustomed to the staccato beat of Morse Code broadcasts spewing from their radios, were astounded to hear music and voice as Reginald Fessenden, a local radio commentator, broadcast the results of the annual New York City yacht races. Listeners could hear the results immediately, instead of waiting for the late edition of the paper. Public perception of the possibilities of radio suddenly began to grow.
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At roughly the same time, the United States military, recognizing the potentially strategic value of radio communications in the armed forces, helped to create the Radio Corporation of America (RCA), ushering wireless technology into the technological forefront. The first wireless applications were developed in 1915 and 1916 for ship-to-ship and ship-to-shore communications. In 1921, the Detroit Police Department inaugurated the first land-based mobile application for radio communications, when they installed one-way radios in patrol cars the original calling all cars application. The system required police officers to stop at a phone box to place a call to their precinct when a call came in, but the ability to quickly and easily communicate with roving officers represented a giant step forward for the police and their ability to respond quickly to calls. Unfortunately, the system was not without its problems. Even though the transmitter was powerful, Detroit s deep concrete canyons prevented the signal from reaching many areas. Equally vexing was the problem of motion: The delicate vacuum tubes, subjected to the endless vibrations stemming from life in the trunk of a moving vehicle, caused both physical and electronic problems that were so bad that in 1927 the Detroit police department shut down the station out of sheer frustration. It wasn t until 1928, when Purdue University student Robert Batts developed a super heterodyne radio that was somewhat resistant to buffeting and vibration, that Detroit reinaugurated their radio system. Other cities followed in Detroit s footsteps. By 1934, there were nearly 200 radio-equipped city police departments communicating with nearly 5,000 roving vehicles. Radio had become commonplace, and in 1937 the FCC stepped in and allocated 19 additional radio channels to the 11 that they had already made available for police department use. No one realized it, but the spectrum battles had begun. Early radio systems were based on amplitude modulation (AM) technology. One drawback of AM radio is that the strength of the transmitted signal diminishes according to the square of the distance. A signal measured at 20 watts, one mile from the transmitter will be one quarter that strength, or 5 watts, two miles from the transmitter. When Edwin Armstrong (see 1) announced and demonstrated his invention of frequency-modulated (FM) radio in 1935, he turned the broadcast industry on its ear. He offered a technology that not only eliminated the random noise and static that plagued AM radio, but also lowered transmitter power requirements and improved the ability of receivers to lock onto a weak signal.
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World War II provided an ideal testing ground for FM. AM radio, used universally by the Axis powers during the war, was easily jammed by powerful Allied transmitters. FM, on the other hand, used only by Allied forces, was unaffected by AM jamming techniques. As we mentioned earlier, many historians believe that FM radio was crucially important to the Allies success in World War II.
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