In the January 1978 issue of Popular Science, we explored the latest innovations in wireless services and their implications for the future.
“Traveling Telephone–new technology expands mobile/portable service”
One cure for this congestion, according to communications experts I’ve talked with, is a blend of the latest in computer and RF technology and the concept of radiotelephone cells and frequency reuse. The two phones I used are examples of this new technology. The base antenna serving some hexagonal cells has six V-shaped sector transmit-and-receive antennas, breaking each of these areas into six smaller cells.
Using this distance information, and the strength of your computer’s signal, the base computer can crank the power output of your mobile transmitter up or down. “It takes care of the portable-in-the-high-building problem, and the mobile-on-a-high hill problem,” says Daskalakis. Traveling telephones at those elevations can transmit much farther than normal, interfering with other cells.
This eight-mile cell system, however, is less sophisticated than the setup originally proposed by American Telephone & Telegraph Co. That system, presented in 1971 to the FCC, specified four-mile radius cells, with directional antennas at alternate corners of each hexagonal cell . With four-mile cells, frequency reuse would be possible in cells 18 miles apart.
While the Illinois Bell system is basically compatible with the Washington-Baltimore setup, there are some differences. A Motorola Dynatac portable, for example, would not function adequately in the initial Chicago system, which lacks sectorized high-gain receive antennas, although a Dynatac car telephone would.
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