Communications HW 4

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12 Terms

1
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FM changes the carrier ___________ whereas AM changes the carrier __________.

frequency, amplitude

2
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Which type of modulation makes the peaks change in amplitude?

AM

3
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The highest modulation index is with

low modulating frequency, wide deviation

4
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Deviation is 3 kHz, and modulating frequency is 12 kHz. The modulation index is

0.25

5
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Which type of modulation makes the peaks spread out or squeeze in?

FM

6
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Per FCC standards, the maximum modulation frequency should be:

15Khz

7
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FM means that modulation changes the

Frequency

8
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In the diagram at right, Vc means

Carrier amplitude

9
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I4NRO is on the 23cm ham band, with carrier frequency 1296 MHz, audio tone frequency 1

kHz, deviation 2 kHz. What is(are) the modulation index(indices)?

2.0

10
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Δf means

Total change in frequency due to modulation

11
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f m means

Frequency of the single modulating tone

12
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What is the frequency range for the FM band?

88MHz-108MHz