Mod 1: Basic RF Theory - PE

Question 1

All electromagnetic waves experience velocity, frequency, and _________.

Answer 1

wavelength

Question 2

[TRUE / FALSE]

The electric and the magnetic fields are arranged 180° from each other.

Answer 2

FALSE.

They are arranged 90* from each other.

Question 3

[TRUE / FALSE]

The electric component runs perpendicular to the direction of the antenna.

Answer 3

FALSE.

The electric component runs parallel to the direction of the antenna, spreading out as it leaves the antenna.

Question 4

Radio signals exist in the form of ______ waves.

Answer 4

electromagnetic

Question 5

The three basic properties of an RF wave include all of the following except :

• Amplitude
• Wavelength
• Frequency
• Phase

Answer 5

Wavelength

Question 6

What happens to a signal when a wave is not absorbed after encountering an obstruction?

• Reflection
• Refraction
• Diffraction
• Path loss

Answer 6

Reflection

Question 7

Of the four main types of interference, which type of interference is defined as mixing together different signals?

• Co-Channel interference
• Adjacent Channel interference
• Inter-modulation interference
• Unintended Electromagnetic Radiation

Answer 7

Inter-modulation interference

Question 8

What occurs when a coherent signal takes multiple paths to a destination, and arrives out of phase?

Answer 8

multi-path

Question 9

What type of RF propagation occurs a radio wave hits an object, and some of its energy is absorbed rather than redirected?

• Reflection
• Refraction
• Diffraction
• Absorption

Answer 9

Absorption

Question 10

This type of interference occurs when channels are close together on different set of frequencies?

• Co-Channel interference
• Adjacent Channel interference
• Inter-modulation interference
• Unintended Electromagnetic Radiation

Answer 10

Adjacent Channel interference

Question 11

The ______ is a high range of frequency signal that does not hold any data.

Answer 11

carrier wave

Question 12

_________ is process by which voice, music, and other “intelligence” is added to the radio waves.

Answer 12

modulation

Question 13

AM radio stations transmit on what frequencies?

• 500 MHz-1605 MHz
• 535 kHz – 1605 kHz
• 87.9 MHz-107.9 MHz
• 87.9 kHz – 107 MHz

Answer 13

535 kHz – 1605 kHz

Question 14

FM radio stations transmit on what frequencies?

• 500 MHz-1605 MHz
• 535 kHz – 1605 kHz
• 87.9 MHz-107.9 MHz
• 87.9 kHz – 107 MHz

Answer 14

87.9 MHz-107.9 MHz

Question 15

In an event where power is observed to decrease, the signal has experienced _____?

• Distance
• Frequency and Noise
• Modulation
• Attenuation

Answer 15

Attenuation