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Antennas should never be placed in such a way that they can fall or blow down on power lines. Also, it should not be possible for power lines to fall or blow down on an antenna. Wireless equipment having outdoor antennas should not be used during thundershowers, or when lightning is anywhere in the vicinity. Antenna construction and maintenance should never be undertaken when lightning is visible or thunder can be heard, even if a storm appears to be many miles away. Ideally, antennas should be disconnected from electronic equipment, and connected to a substantial earth ground, at all times when the equipment is not in use. Tower and antenna climbing is a job for professionals. Under no circumstances should an inexperienced person attempt to climb such a structure. Indoor transmitting antennas can expose operating personnel to EM field energy. The extent of the hazard, if any, posed by such exposure has not been firmly established. However, there is sufficient concern to warrant checking the latest publications on the topic. For detailed information concerning antenna safety, consult a professional antenna engineer and/or a comprehensive text on antenna design and construction.
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Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 1. Imagine a center-fed, straight wire antenna in free space, whose length can be varied at will. At which of the following lengths is the radiation resistance at the feed point the highest (a) /4 (b)
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(c) /3 (d) /2 2. What is the approximate length, in meters (m), of a center-fed, /2 wire antenna at a frequency of 18.1 MHz Assume the velocity factor is typical for wire. (a) 7.90 m (b) 8.29 m (c) 13.6 m (d) 25.9 m 3. What is the approximate height, in feet (ft), of a ground-mounted, /4 vertical antenna, made of aluminum tubing, at a frequency of 7.025 MHz Assume the velocity factor is 92 percent. (a) 64.43 ft (b) 32.22 ft (c) 19.64 ft (d) 9.822 ft 4. In order to obtain reasonable efficiency with a /4 vertical antenna mounted over poorly conducting soil at a frequency of 10 MHz, it is necessary to (a) make the antenna out of large-diameter aluminum or copper tubing. (b) suspend the antenna from a kite or balloon. (c) feed the antenna with a waveguide. (d) minimize the loss resistance by installing numerous ground radials. 5. A driven element in a parasitic array is (a) grounded for dc. (b) a loop with a circumference of /2. (c) connected to the feed line. (d) a straight length of wire. 6. In a zepp antenna, feed-line radiation can be minimized by (a) using the antenna only at frequencies where its length is a whole-number multiple of /2. (b) using the antenna only at frequencies where its length is a whole-number multiple of /4. (c) using the antenna only at frequencies where its length is an even-number multiple of /10. (d) using the antenna only at frequencies where its length is an odd-number multiple of /4. 7. Consider a single-turn, closed loop having a circumference of 95 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 10 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.
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(c) along a line coinciding with the path of the feed line. (d) equally in all directions in three-dimensional space. 8. Suppose an antenna system has a radiation resistance of 40 at 8.5 MHz. What is the efficiency of this system (a) 25 percent (b) 40 percent (c) 80 percent (d) Impossible to determine without more information 9. Suppose an antenna system has a radiation resistance of 40 and a loss resistance of 10 . What is the efficiency of this system (a) 25 percent (b) 40 percent (c) 80 percent (d) Impossible to determine without more information 10. The null in a loopstick antenna exists (a) in the plane perpendicular to the coil axis. (b) in the line that coincides with the coil axis. (c) at a 45 angle with respect to the coil axis. (d) nowhere, because a loopstick is an isotropic antenna. 11. As elements are added to a properly designed Yagi antenna, (a) the forward gain decreases. (b) the f/b ratio decreases. (c) the f/s ratio increases. (d) None of the above apply. 12. When the radiation resistance in an antenna system represents most of the total system resistance, (a) the system can be expected to have high loss. (b) the system can be expected to have high efficiency. (c) the system can be expected to have a high f/s ratio. (d) the system can be expected to have a high f/b ratio. 13. What state of affairs is optimal in a waveguide (a) A colony of spiders inside (b) A cross-sectional measurement of less than /4 (c) Operation at frequencies below 3 MHz (d) None of the above
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