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Another way to improve image rejection is to convert the 9.000-MHz (or whatever frequency) first IF to a lower IF, known as the second IF. This is usually a frequency between about 50 kHz and 500 kHz. A standard second IF is 455 kHz. The resulting receiver is a double-conversion superhet. Sometimes the second IF is converted to a still lower frequency, called the third IF, usually 50 kHz. This is a triple-conversion superhet. The main advantage of using double or triple conversion, besides superior image rejection, is the fact that low IFs can be easily filtered to provide superior adjacentchannel rejection. Low IFs aren t practical with single-conversion receivers, because fIMAGE would be too close to fIN, and the front end could not adequately differentiate between them. This problem would be worst at the highest frequencies fIN.
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Detector and audio/video amplifier
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Once the IF signal has been filtered and amplified, it passes through a detector. This is generally a product detector for CW, FSK, and SSB, a ratio detector or PLL for FM, and an envelope detector for AM. Following the detector, a DSP circuit might be used. This further enhances the S/N ratio, minimizing the number of printer or display errors, or clarifying the audio or video.
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Quiz 517 Finally, an audio/video amplifier is used to boost the level to whatever is needed to drive the speaker, teleprinter, monitor, or instrumentation at the receiver output.
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A modulated-light receiver
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Modulated light beams can be demodulated easily using photodiodes or photovoltaic cells, as long as the modulating frequency isn t too high. At audio frequencies, a circuit such as the one in Fig. 27-14 will provide sufficient output to drive a headset. This demonstrates the method by which fiberoptic signals are detected.
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27-14 A simple modulated-light receiver.
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For use with a speaker, another bipolar amplifier stage can be added following the stage shown. To increase the sensitivity of the receiver (that is, to allow reception of much fainter modulated-light beams), an FET stage can be added between the photovoltaic cell and the bipolar stage shown. Modulated-light experiments can be done with simple apparatus, costing only a few dollars. If reasonably large lenses and/or reflectors are used, line-of-sight voice communications can be had for distances up to several hundred feet, using circuits based on the transmitter of Fig. 26-17 and the receiver of Fig. 27-14. With additional amplification and very large reflectors, the range can be increased to several miles on clear nights. This could make a great science-fair project.
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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. The reflected wave in a radio signal: A. Travels less distance than the direct wave.
518 Data reception B. Travels just as far as the direct wave. C. Travels farther than the direct wave. D. Might travel less far than, just as far as, or farther than the direct wave. 2. The reflected wave: A. Arrives in phase with the direct wave. B. Arrives out of phase with the direct wave. C. Arrives in a variable phase compared with the direct wave. D. Is horizontally polarized. 3. The ionospheric layer that absorbs radio waves is: A. The D layer. B. The E layer. C. The F layer. D. No layers ever absorb radio waves. 4. The highest layer of the ionosphere is: A. The D layer. B. The E layer. C. The F layer. D. Dependent on the time of day and the solar cycle. 5. Radio waves that curve earthward in the lower atmosphere are being affected by: A. Troposcatter. B. The D layer. C. Ionospheric ducting. D. Tropospheric bending. 6. Single-sideband can be demodulated by: A. An envelope detector. B. A diode. C. A BFO and mixer. D. A ratio detector. 7. A diode and capacitor can be used to detect: A. CW. B. AM. C. SSB. D. FSK. 8. The S N/N ratio is a measure of. A. Sensitivity.
Quiz 519 B. Selectivity. C. Dynamic range. D. Adjacent-channel rejection. 9. The ability of a receiver to perform in the presence of strong signals is a consequence of its: A. Sensitivity. B. Noise figure. C. Dynamic range. D. Adjacent-channel rejection. 10. A receiver that responds to a desired signal, but not to one very nearby in frequency, has good: A. B. C. D. Sensitivity. Noise figure. Dynamic range. Adjacent-channel rejection.
11. An AM receiver can be used to demodulate FM by means of: A. Envelope detection. B. Product detection. C. Slope detection. D. Pulse detection. 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. Time-division multiplex is often done with: A. AM. B. FM. C. FSK. D. PM. 14. A continuously variable signal is recovered from a signal having discrete states by: A. A ratio detector. B. A D/A converter. C. A product detector. D. An envelope detector.
520 Data reception 15. Digital modulation is superior to analog modulation in the sense that: A. Analog signals have discrete states, while digital ones vary continuously. B. Digital signals resemble noise less than analog ones. C. Digital signals are easier to use with FM. D. Digital signals have greater bandwidth. 16. A product detector would most often be used to receive: A. AM. B. CW. C. FM. D. None of the above. 17. To receive UHF signals on a shortwave receiver, you would need: A. A heterodyne detector. B. A product detector. C. An up converter. D. A down converter.
18. Image rejection in a superhet receiver is enhanced by: A. Front-end selectivity. B. A product detector. C. A variable LO. D. A sensitive IF amplifier chain.
19. A low IF is not practical with a single-conversion receiver because: A. Product detection cannot be used. B. The image frequency would be too close to the incoming-signal frequency. C. Sensitivity would be impaired. D. Adjacent-channel rejection would be poor. 20. Digital signal processing can be used to advantage with: A. SSB. B. SSTV. C. FSK. D. Any of the above.
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