Radio Wave Propagation (3 Questions)

Question 1

What is a selective fading effect?

1. A fading effect caused by small changes in beam heading at the receiving station
2. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station
3. A fading effect caused by large changes in the height of the ionosphere, as experienced at the receiving station
4. A fading effect caused by time differences between the receiving and transmitting stations

Answer 1

A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station

Question 2

What is the propagation effect called when phase differences between radio wave components of the same transmission are experienced at the recovery station?

1. Faraday rotation
2. Diversity reception
3. Selective fading
4. Phase shift

Answer 2

Selective fading

Question 3

What is the major cause of selective fading?

1. Small changes in beam heading at the receiving station
2. Large changes in the height of the ionosphere, as experienced at the receiving station
3. Time differences between the receiving and transmitting station
4. Phase differences between radio wave components of the same transmission, as experienced at the receiving station

Answer 3

Phase differences between radio wave components of the same transmission, as experienced at the receiving station

Question 4

Which emission modes suffer the most from selective fading?

1. CW and SSB
2. FM and double sideband AM
3. SSB and image
4. SSTV and CW

Answer 4

FM and double sideband AM

Question 5

How does the bandwidth of the transmitted signal affect selective fading?

1. It is more pronounced at wide bandwidths
2. It is more pronounced at narrow bandwidths
3. It is equally pronounced at both narrow and wide bandwidths
4. The receiver bandwidth determines the selective fading effect

Answer 5

It is more pronounced at wide bandwidths

Question 6

What phenomenon causes the radio-path horizon distance to exceed the geometric horizon?

1. E-layer skip
2. D-layer skip
3. Auroral skip
4. Radio waves may be bent

Answer 6

Radio waves may be bent

Question 7

How much farther does the radio-path horizon distance exceed the geometric horizon?

1. By approximately 15% of the distance
2. By approximately twice the distance
3. By approximately one-half the distance
4. By approximately four times the distance

Answer 7

By approximately 15% of the distance

Question 8

What propagation condition is usually indicated when a VHF signal is received from a station over 500 miles away?

1. D-layer absorption
2. Faraday rotation
3. Tropospheric ducting
4. Moonbounce

Answer 8

Tropospheric ducting

Question 9

**What happens to a radio wave as it travels