Chapter 9 / 9.6 / 9.6.7

9.6.7 Why Must Radio Receivers Reject Unwanted Signals?

Explore how receivers distinguish the desired signal from nearby transmissions. Learn about selectivity, image frequencies, adjacent-channel interference, intermodulation, filtering, and the importance of receiver front-end design.

1. What Is Receiver Selectivity?
2. Why Is Selectivity Important?
3. Isn't Tuning Enough?
4. What Is a Filter?
5. Why Are Band-Pass Filters So Important?
6. What Is Adjacent-Channel Interference?
7. What Is Co-Channel Interference?
8. What Is Image Frequency?
9. How Are Image Frequencies Rejected?
10. What Is Receiver Blocking?
11. What Is Desensitization?
12. What Is Intermodulation?
13. Why Is the Receiver Front End So Important?
14. What Is Dynamic Range?
15. How Does Digital Signal Processing Improve Selectivity?
16. What Is Adaptive Filtering?
17. Why Is Narrower Bandwidth Often Better?
18. Where Is Excellent Selectivity Most Important?
19. Why Are Modern Receivers Better Than Earlier Designs?

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