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10. A receiver that responds to a desired signal, but not to another signal very close by in frequency, has good (a) sensitivity. (b) noise figure. (c) dynamic range. (d) selectivity. 11. Fill in the blank in the following sentence to make it true: The deviation of a narrowband voice FM signal normally extends up to either side of the unmodulated-carrier frequency. (a) 3 kHz (b) 5 kHz (c) 10 kHz (d) 3 MHz 12. An FM detector with built-in limiting is (a) a ratio detector. (b) a discriminator. (c) an envelope detector. (d) a product detector. 13. In which mode of PM does the peak power level of the pulses vary (a) PAM (b) PDM (c) PIM (d) PFM 14. A continuously variable signal (such as music audio) can be recovered from a signal having only a few discrete levels or states by means of (a) a ratio detector. (b) a D/A converter. (c) a product detector. (d) an envelope detector. 15. In which mode are signals intertwined in the time domain at the transmitter, and then separated again at the receiver (a) FDM (b) AFSK (c) PCM (d) None of the above 16. Which of the following modes can be demodulated with an envelope detector (a) AM (b) CW
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440 Wireless Transmitters and Receivers
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(c) FSK (d) USB 17. The bandwidth of a fax signal is kept narrow by (a) sending the data at a slow rate of speed. (b) maximizing the number of digital states. (c) optimizing the range of colors sent. (d) using pulse modulation. 18. The dynamic range in a superhet is largely influenced by the performance of the (a) local oscillator. (b) product detector. (c) front end. (d) selectivity in the IF chain. 19. Frequency sweeping can be used to get a transmitter to produce (a) spread-spectrum signals. (b) time division multiplexed signals. (c) narrowband AM signals. (d) double sideband, suppressed carrier signals. 20. Fill in the blank to make the following sentence true: The reception of improved by the use of DSP. (a) SSB signals (b) SSTV signals (c) synchronized communications signals (d) any of the above can be
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CHAPTER
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A SIGNAL IS DIGITAL WHEN IT CAN ATTAIN ONLY SPECIFIC LEVELS. THIS IS IN CONTRAST TO ANALOG
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signals or quantities that vary over a continuous range. A simple analog waveform is shown at Fig. 26-1A; note that the amplitude varies smoothly over time. Figure 26-1B is an example of a digital approximation of the same signal.
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26-1 An analog wave (A), and a digital rendition of this wave (B).
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People are used to dealing with the decimal number system, which has 10 different digits. But machines use schemes that have some power of 2 digits, such as 2 (21), 4 (22), 8 (23), 16 (24), 32 (25), 64 (26), and so on.
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442 Digital Basics
Decimal The decimal number system is also called base 10 or radix 10. The set of possible digits is {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}. The first digit to the left of the radix or decimal point is multiplied by 100, or 1. The next digit to the left is multiplied by 101, or 10. The power of 10 increases as you move farther to the left. The first digit to the right of the decimal point is multiplied by a factor of 10 1, or 1 10. The next digit to the right is multiplied by 10 2, or 1 100. This continues as you go farther to the right. Once the process of multiplying each digit is completed, the resulting values are added up. For example:
2 103 + 7 102 + 0 101 + 4 100 + 5 10 1 + 3 10 2 + 8 10 3 + 1 10 4 + 6 10 5 = 2704.53816
Binary The binary number system is a method of expressing numbers using only the digits 0 and 1. It is sometimes called base 2 or radix 2. The digit immediately to the left of the radix point is the ones digit. The next digit to the left is a twos digit; after that comes the fours digit. Moving farther to the left, the digits represent 8, 16, 32, 64, and so on, doubling every time. To the right of the radix point, the value of each digit is cut in half again and again, that is, 1 2, 1 4, 1 8, 1 16, 1 32, 1 64, and so on. Consider the decimal number 94. In the binary number system, this number is written as 1011110. It breaks down as follows:
0 20 + 1 21 + 1 22 + 1 23 + 1 24 + 0 25 + 1 26 = 1011110 When you work with a computer or calculator, you give it a decimal number that is converted into binary form. The computer or calculator does its operations entirely using the digits 0 and 1. When the process is complete, the machine converts the result back into decimal form for display. In a communications system, binary numbers can represent alphanumeric characters, shades of color, frequencies of sound, and other variable quantities.
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