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23. What is the minimum AM signal needed to transmit information? 24. The main advantage of SSB over standard AM or DSB is 25. In SSB, which sideband is the best to use? 26. The typical audio modulating frequency range used in radio and telephone communications is 27. An AM signal with a maximum modulating signal frequency of 4.5 kHz has a total bandwidth of 28. Distortion of the modulating signal produces harmonics which cause an increase in the signal 29. The process of translating a signal, with or without modulation, to a higher or lower frequency for processing is called 30. Frequency translation is carried out by a circuit called a 31. An input signal of 1.8 MHz is mixed with a local oscillation of 5 MHz. A filter selects the difference signal. The output is 32. The output of an SSB transmitter with a 3.85 MHz carrier and a 1.5 kHz sine wave modulating tone is 33. An SSB transmitter produces a 400 V peak-to-peak signal across a 52 ohms antenna load. The PEP output is Solution: 34. The output power of an SSB transmitter is usually expressed in terms of 35. An SSB transmitter has a PEP rating of 1 kW. The average output power is in the range of Chapter 3: AM Circuits 1. Amplitude modulation is the same as 2. In a diode modulator, the negative half of the AM wave is supplied by a(n) 3. Amplitude modulation can be produced by 4. Amplitude modulators that vary the carrier amplitude with the modulating signal by passing it through attenuator work on the principle of an 5. In Fig. 3-4, D1is a 6. The component used to produce AM at very high frequencies is a 7. Amplitude modulation generated at a very low voltage or power amplitude is known as 8. A collector modulator has a supply voltage of 48 V. The peak-to-peak amplitude of the modulating signal for 100 percent modulation is 9. A collector modulated transmitter has a supply voltage of 24 V and a collector