RF Theory PE

Question 1

All electromagnetic waves experience velocity, frequency, and _________

Answer 1

Wavelength

Question 2

The electric and the magnetic fields are arranged 180° from each other,
T/F

Answer 2

False its 90 degrees

Question 3

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

Answer 3

False. It runs parallel

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?

Answer 6

Reflection

Question 7

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

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?

Answer 9

Absorption

Question 10

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

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?

Answer 13

535 kHz – 1605 kHz

Question 14

FM radio stations transmit on what frequencies?

Answer 14

87.9 MHz-107.9 MHz

Question 15

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

Answer 15

Attenuation