Mod 5 worksheets

Question 1

The process of superimposing an input signal, also called the intelligence signal, onto a carrier wave is called

Answer 1

Modulation

Question 2

Which is not a form of modulation: Amplitude, Frequency, Phase, Time

Answer 2

Time

Question 3

What type of modulation changes the voltage of the RF carrier for transmitting?

Answer 3

Amplitude

Question 4

In amplitude modulation, what parts of the intelligence waveform affect the amplitude of the modulated waveform.

Answer 4

Amplitude

Question 5

In amplitude modulation, what are the output signals of the modulator?

Answer 5

USB, LSB

Question 6

Which type of modulation inefficiently uses bandwidth and power during transmission?

Answer 6

AM

Question 7

What is the important AFI for Spectrum Interference resolution Program

Answer 7

AFI 17-221

Question 8

List three advantages of Amplitude modulation

Answer 8

Simple to implement. Demodulated with a Single diode rectifier circuit. Cheap

Question 9

What is Neutral EMI

Answer 9

Man made devices such as florescent lights

Question 10

What is Natural EMI

Answer 10

Non-man made, lightning

Question 11

What is RFI

Answer 11

Radio Frequency Interference

Question 12

Where do you look for information on ISP resolution

Answer 12

Paragraph 4 AFI 17-221

Question 13

List three disadvantages of Amplitude Modulation

Answer 13

inefficient use of power. Inefficient use of bandwidth. Prone to high levels of noise.

Question 14

The synchronous mode of TDM uses ____ bits

Answer 14

Frame

Question 15

The asynchronous mode of TDM uses ____ bits

Answer 15

Start and Stop

Question 16

What are the characteristics of an antenna wave

Answer 16

Amplitude, Frequency, Wavelength

Question 17

When and what frequencies work better with sky waves?

Answer 17

Night, Lower

Question 18

Free electrons in the ionosphere form into electron clouds that vary in

Answer 18

thickness

Question 19

Signal absorption mainly occurs in the ___ layer of the ionosphere

Answer 19

D

Question 20

Caused by random changes in the air and weather

Answer 20

Tropospheric scintillation

Question 21

____ is the weakening of signals in the atmosphere

Answer 21

Atmospheric attenuation

Question 22

Electrical wavelength is measured in

Answer 22

Wavelength

Question 23

The difference in the length of a wave as it travels through a new medium is the ____

Answer 23

Electrical length

Question 24

Which field determines the polarization of an antenna?

Answer 24

E

Question 25

____ radiation patterns are plotted as a function of the square of the magnitude of electric and magnetic fields on a DB scale

Answer 25

Power

Question 26

____ radiation patterns are plotted as a function of electric and magnetic fields on a logarithmic scale

Answer 26

Field

Question 27

Interference from 2 or more electrical systems affecting all systems equally is _______

Answer 27

Mutual Interference

Question 28

What type of antenna uses a ground plane to create a ground reflected image?

Answer 28

Whip

Question 29

This antenna can be center fed, end fed, or offset fed

Answer 29

Dipole

Question 30

What is MUF

Answer 30

Maximum usable frequency (The frequency that doesn't get absorbed or sent to space)

Question 31

What is VSWR

Answer 31

Voltage standing wave ratio, 1 to 1 is best

Question 32

What is this equation: C/F= Lambda

Answer 32

Electrical length. Speed of light, frequency, and wavelength

Question 33

What is velocity factor?

Answer 33

Whanging the speed of the EM waves below the speed of light. This is important for Electrical impedance.

Question 34

What is the law of reciprocity?

Answer 34

The antenna is just as good at receiving and transmitting

Question 35

What is antenna Gain.

Answer 35

The directivity of the antenna based on the dBi.

Question 36

What is an isotropic antenna?

Answer 36

A theoretical antenna that radiates perfectly in all directions.

Question 37

What is mutual interference?

Answer 37

When 2 or more devices interfere with each other.

Question 38

What are the important factors of radio etiquette?

Answer 38

Clarity, Simplicity, Brevity, Security

Question 39

What are thee Phonetic alphabet words for A, B, and C

Answer 39

Alpha, Bravo, Charlie

Question 40

What is takeoff angle?

Answer 40

The angle at which a radio wave leaves the antenna. Determines the Range.

Question 41

What device do Parabolic antennas use to transmit radio waves?

Answer 41

Feed horn (LOS)

Question 42

What is the important AFI that uses paragraph 4 for Installation Spectrum Managers (ISP).

Answer 42

AFI 17-221

Question 43

Encode is on which end

Answer 43

transmit