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14. Consider a single-turn, closed loop having a circumference of 65 ft. Suppose this loop is circular, lies entirely in a single plane, is fed with open-wire transmission line and an antenna tuner, and is operated at 7 MHz. The maximum radiation and response for this loop can be expected to occur (a) in the plane containing the loop. (b) along a line perpendicular to the plane containing the loop. (c) along a line coinciding with the path of the feed line. (d) equally in all directions in three-dimensional space. 15. Suppose the total resistance in an antenna system is 80 , and the loss resistance is 20 . The efficiency of the system is (a) 80 percent. (b) 75 percent. (c) 25 percent. (d) impossible to determine without more information. 16. In a parasitic array, a director is usually (a) tuned to a slightly higher frequency than the driven element. (b) connected to a system of ground radials. (c) a closed loop that is grounded for RF. (d) a straight length of wire or tubing. 17. A J pole is a modified form of (a) ground-plane antenna. (b) folded dipole antenna. (c) quad antenna. (d) zepp antenna. 18. Which of the following antenna types is well suited to use with parallel-wire transmission line (a) The ground plane (b) The ground-mounted vertical (c) The folded dipole (d) None of the above 19. Which of the following antenna types is not designed for transmitting at 10 GHz (a) A horn antenna (b) A dish antenna (c) A zepp antenna (d) A helical antenna
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490 Antennas
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20. A vertical antenna measuring /2 in height does not require a ground system with low resistance because (a) its loss resistance is high. (b) its radiation resistance is low. (c) its main lobe is sharp. (d) None of the above apply.
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CHAPTER
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Integrated Circuits
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INTEGRATED CIRCUITS (ICs), ALSO CALLED CHIPS, HAVE STIMULATED AS MUCH EVOLUTION AS ANY
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single development in the history of electronic technology. Most ICs look like gray or black plastic boxes with protruding pins. The schematic symbols are triangles or rectangles with lines emerging from them, labeled according to their functions.
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Advantages of IC Technology
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Integrated circuits have advantages over discrete components (individual transistors, diodes, capacitors, and resistors). Here are some of the most important considerations.
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Compactness An obvious asset of IC design is economy of space. They are far more compact than equivalent circuits made from discrete components. A corollary to this is the fact that more complex circuits can be built, and kept down to a reasonable size, using ICs as compared with discrete components. High Speed The interconnections among the components within an IC are physically tiny, making high switching speeds possible. Electric currents travel fast, but not instantaneously. The less time charge carriers need to get from component X to component Y, in general, the more computations are possible within a given span of time, and the less time is needed for complex operations. Low Power Consumption Another advantage of ICs is the fact that they use less power than equivalent discrete-component circuits. This is crucial if batteries are to be used for operation. Because ICs use so little current, they produce less heat than their discrete-component equivalents. This translates into better efficiency. It also minimizes the problems that bedevil equipment that gets hot with use, such as frequency drift and generation of internal noise.
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492 Integrated Circuits
Reliability Integrated circuits fail less often, per component-hour of use, than systems that use discrete components. This is because all the component interconnections are sealed within the IC case, preventing corrosion or the intrusion of dust. The reduced failure rate translates into less downtime, or time during which the equipment is out of service for repairs. Ease of Maintenance Integrated-circuit technology lowers maintenance costs. Repair procedures are simplified when failures occur. Many appliances use sockets for ICs, and replacement is simply a matter of finding the faulty IC, unplugging it, and plugging in a new one. Special desoldering equipment is used with appliances having ICs soldered directly to the circuit boards. Modular Construction Modern IC appliances use modular construction. In this scheme, individual ICs perform defined functions within a circuit board; the circuit board or card, in turn, fits into a socket and has a specific purpose. Computers, programmed with customized software, are used by repair technicians to locate the faulty card in an appliance. The whole card can be pulled and replaced, getting the appliance back to the consumer in the shortest possible time. Then a computer can be used to troubleshoot the faulty card, getting the card ready for use in the next appliance that happens to come along with a failure in the same card.
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