Ch 1 - P 1 - Analog Signals

Question 1

What is the most fundamental concept of an analog signal?

Answer 1

Sinusoid

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Question 2

Name the 3 parameters used to describe a sinusoid.

Answer 2

1. Amplitude
2. Frequency
3. Phase

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Question 3

What is the standard unit of frequency measurement?

Answer 3

Hertz (Hz)

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Question 4

What formula is used to represent the relationship between cycle time and frequency?

Answer 4

f = 1/T

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Question 5

What is the typical range of frequencies that humans can hear?

Answer 5

20 Hz to 20,000 HZ

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Question 6

What range of frequencies is typically used for voice telephone circuits?

Answer 6

300 Hz to 3,400 Hz

Question 7

What is a phase?

Answer 7

A description of the reference time, t = 0

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Question 8

How many degrees are in a cycle?

Answer 8

360 degrees TDMM: page 1-19

Question 9

What is the signal’s spectrum?

Answer 9

A sum of sinusoidal signals that differ in amplitude, frequency, and phase?

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Question 10

What is necessary for the received signal to be an exact duplicate of the transmitted signal?

Answer 10

The transmission system must not change the frequency of any signal components, and the relative amplitude and phases of all components must be maintained.

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Question 11

What defines the analog signal’s bandwidth?

Answer 11

The frequency range of the sinusoidal signals needed to describe an analog signal.

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Question 12

What is the frequency range of the very low frequency (VLF) band?

Answer 12

3 to 30 kHZ

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Question 13

What is the frequency range of the low frequency (LF) band?

Answer 13

30 to 300 kHz

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Question 14

What is the frequency range of the medium frequency (MF) band?

Answer 14

300 to 3000 kHz

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Question 15

What is the frequency range of the high frequency (HF) band?

Answer 15

3 to 30MHz

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Question 16

What is the frequency range of the very high frequency (VHF) band?

Answer 16

30 to 300 MHz

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Question 17

What is the frequency range of the ultra high frequency (UHF) band?

Answer 17

300 to 3000 MHz

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Question 18

What is the frequency range of the community antenna TV (CATV) band?

Answer 18

54 to 1002 MHz

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Question 19

What is the frequency range of the super high frequency (SHF) band?

Answer 19

3 to 30 GHz

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Question 20

What is the frequency range of the extremely high frequency (EHF) band?

Answer 20

30 to 300 GHz

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Question 21

What unit of measure is often used to express the strength of a signal?

Answer 21

Decibel (dB)

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Question 22

What dB change occurs when the power is doubled?

Answer 22

+3 dB

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Question 23

What dB change occurs when the power is reduced by half?

Answer 23

-3 dB

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Question 24

Decibel levels are used to express power rations of types of analog, digital signals, regardless of the medium.

Answer 24

True. Decibel levels are used to express power rations of all types of analog and digital signals, regardless of the medium.

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Question 25

In telephony, which delays re perceptible?

Answer 25

Delays greater than 50 ms if they are of sufficient strength.

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