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Electronic

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Submitted By abueideh2000
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1. Define angle modulation and list its subcategories.

Answer: Angle modulation is defined as modulation where the angle of a sine-wave carrier is varied from its reference value. The subcategories are Phase modulation and Frequency modulation.

2. What is the difference between frequency and phase modulation?

Answer: The difference between frequency and phase modulation is; Frequency modulation is where the instantaneous frequency of a carrier is caused to vary by an amount proportional to the modulating signal amplitude, Phase modulation is the same but it is where the phase angle of a carrier is caused to depart from its reference value.

6. Define deviation constant.

Answer: Deviation Constant is defined as in units of kHz/V. and it’s how much the carrier frequency will deviate for a given modulating input voltage level.

7. A 50-mV sinusoid, at a frequency of 1 kHz, is applied to a capacitor microphone FM generator. If the deviation constant for the capacitor microphone FM generator is 500 Hz/20 mV, determine:
(a) The total frequency deviation. (±1.25 kHz)

Answer: 50mV x (500 Hz)/(20 mV)= ±1.25 kHz

(b) The rate at which the carrier frequency is being deviated. (1 kHz)
Answer: The rate at which the carrier frequency is being deviated is ±1.25 kHz at a rate of 1 kHz.

8. Explain how the intelligence signal modulates the carrier.

Answer: The intelligence signal modulates the carrier by the intelligence amplitude determines the amount of the carrier frequency deviation and the intelligence frequency determines the rate of carrier frequency deviation.

12. Define modulation index (mf) as applied to an FM system.
Answer: Modulation index is defined as the measure of the extent to which a carrier is varied by the intelligence.
14. Explain what happens to the carrier in FM broadcast

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