Abstract :
More than 50% of the radio spectrum below 1,000 MHz has been allocated to the broadcast services. Less than 15% of this broadcast space is currently being utilized in the New York City metropolitan area. Even less is being utilized in most other areas. Within the unused television channels, there is room for more than 15,000 land mobile radio channels. But, the broadcast industry is not eager to give up any of its available spectrum space. We can, however, utilize broadcast facilities to alleviate congestion in the mobile radio services without taking away any broadcast channels. We can make use of what I call a vast ??wasteband??. Any of the nation??s 1800 FM broadcast stations can apply for a Subsidiary Carrier Authorization, known as an SCA. At the present time, FM broadcast stations with an SCA channel usiet for broadcasting background music and for storecasting. The SCA channel is transmitted simultaneously with the main channel public program.
