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Questions and Answers
What is the purpose of using repeater stations in communication at VHF, UHF, and microwave frequencies?
What is the purpose of using repeater stations in communication at VHF, UHF, and microwave frequencies?
- To decrease the range of transmission and reception
- To reduce the need for tall buildings or mountains for antenna placement
- To increase the directivity of antennas
- To amplify and retransmit signals on different frequencies (correct)
Where are antennas for transmitters and receivers operating at very high frequencies typically located?
Where are antennas for transmitters and receivers operating at very high frequencies typically located?
- In underground tunnels
- On flat plains
- Underwater
- On top of tall buildings or mountains (correct)
How is the output power of a transmitter typically determined?
How is the output power of a transmitter typically determined?
- By the type of antenna used
- By measuring the directivity of the antenna
- By calculating or measuring it (correct)
- By the distance between the transmitter and receiver
What is one advantage of using microwave relay stations for long-distance communication?
What is one advantage of using microwave relay stations for long-distance communication?
What happens to a signal as it leaves an antenna in terms of attenuation?
What happens to a signal as it leaves an antenna in terms of attenuation?
What role do tall buildings or mountains play in increasing the range of transmission and reception for high-frequency antennas?
What role do tall buildings or mountains play in increasing the range of transmission and reception for high-frequency antennas?
What is the primary method of radio signal propagation described in the text?
What is the primary method of radio signal propagation described in the text?
What is the characteristic of space waves or direct waves according to the text?
What is the characteristic of space waves or direct waves according to the text?
What is the formula given in the text for computing the distance between a transmitting antenna and the horizon?
What is the formula given in the text for computing the distance between a transmitting antenna and the horizon?
What is the practical transmission distance for a transmitting antenna that is 350 ft high and a receiving antenna that is 25 ft high?
What is the practical transmission distance for a transmitting antenna that is 350 ft high and a receiving antenna that is 25 ft high?
What is the frequency range for which line-of-sight communication is characteristic according to the text?
What is the frequency range for which line-of-sight communication is characteristic according to the text?
Why must very high transmitting antennas be used for FM and TV broadcasts according to the text?
Why must very high transmitting antennas be used for FM and TV broadcasts according to the text?
What causes the variation in signal amplitude at the receiver known as fading?
What causes the variation in signal amplitude at the receiver known as fading?
What happens to the received signal when a receiver gets farther away from a transmitter?
What happens to the received signal when a receiver gets farther away from a transmitter?
What phenomenon causes fading when objects obstruct the path between a transmitter and receiver?
What phenomenon causes fading when objects obstruct the path between a transmitter and receiver?
How does shadow fading occur according to the text?
How does shadow fading occur according to the text?
What is the primary reason for the modification of the formula for power density from an isotropic radiator?
What is the primary reason for the modification of the formula for power density from an isotropic radiator?
Why does the received signal vary in amplitude due to fading?
Why does the received signal vary in amplitude due to fading?
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