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The first FM radiotelephone systems were massively inefficient. They required 120 kHz of channel bandwidth to transport a 3-kHz voice signal. As the technology advanced, though, this requirement was reduced. In the 1950s, the FCC mandated that channels be halved to 60 kHz, and by the 1960s things had advanced to the point that the spectrum could be further reduced to 30 kHz, where it remains today in analog systems. Realize that this is still a 10:1 ratio. AT&T introduced the first commercial mobile telephone service in St. Louis in 1946. It relied on a single, high-power transmitter placed atop one of the city s tallest buildings and had an effective service range of about 50 miles. This FM system was fully interconnected with AT&T s wireline telephone network. The service was not cheap. The monthly charge was $15, and usage was billed at a flat 15 per minute. In spite of the cost, the service was quite popular, a fact that led to its undoing. System engineers based their design on existing radio systems that were primarily designed for dispatch applications. The traffic patterns of radio dispatches are different than telephony: a dispatch occupies several seconds of airtime, while a telephone call typically lasts several minutes. Almost immediately, blocking became a serious problem. In fact, in New York City, where the service quickly became popular, AT&T had 543 active subscribers in 1976 and a waiting list of nearly 4,000 anxious-to-be-connected customers that the system s limited capacity could not accommodate.

18 Basic physical concepts Law. If the EMF is doubled, the current is doubled. If the resistance is doubled, the current is cut in half. This important law of electrical circuit behavior is covered in detail a little later in this book. It is possible to have an EMF without having any current. This is the case just before a lightning bolt occurs, and before you touch that radiator after walking on the carpet. It is also true between the two wires of an electric lamp when the switch is turned off. It is true of a dry cell when there is nothing connected to it. There is no current, but a current is possible given a conductive path between the two points. Voltage, or EMF, is sometimes called potential or potential difference for this reason. Even a very large EMF might not drive much current through a conductor or resistance. A good example is your body after walking around on the carpet. Although the voltage seems deadly in terms of numbers (thousands), there are not that many coulombs of charge that can accumulate on an object the size of your body. Therefore in relative terms, not that many electrons flow through your finger when you touch a radiator so you don t get a severe shock. Conversely, if there are plenty of coulombs available, a small voltage, such as 117 volts (or even less), can result in a lethal flow of current. This is why it is so dangerous to repair an electrical device with the power on. The power plant will pump an unlimited number of coulombs of charge through your body if you are foolish enough to get caught in that kind of situation.

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18. Which one of the following does not affect the power output available from a particular ac generator (a) The strength of the magnet (b) The number of turns in the coil (c) The type of natural energy source used (d) The speed of rotation of the coil or magnet 19. If a 175-V dc source were connected in series with the utility mains from a standard wall outlet, the result would be (a) smooth dc at a constant voltage. (b) pure ac with equal peak voltages. (c) ac with one peak voltage greater than the other. (d) fluctuating dc. 20. An advantage of ac over dc in utility applications is the fact that (a) ac is easier to transform from one voltage to another. (b) ac is transmitted with lower loss in wires. (c) ac can be easily obtained from dc generators. (d) ac can be generated with less-dangerous by-products.

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