Podcast
Questions and Answers
Why are microwave frequencies limited to line-of-sight applications?
Why are microwave frequencies limited to line-of-sight applications?
- They reflect off surfaces
- They propagate in a straight line (correct)
- They are absorbed by the atmosphere
- They require digital modulation
What type of modulation is commonly used in existing microwave radio systems?
What type of modulation is commonly used in existing microwave radio systems?
- Phase-Shift Keying
- Frequency Modulation (FM) (correct)
- Quadrature Amplitude Modulation (QAM)
- Amplitude Modulation (AM)
Why are digital modulation techniques like phase-shift keying preferred in some microwave systems?
Why are digital modulation techniques like phase-shift keying preferred in some microwave systems?
- They are more efficient in power consumption
- They offer higher frequencies
- They have shorter propagation distances
- They are less affected by nonlinear distortion (correct)
What is a primary difference between satellite and terrestrial microwave radio systems?
What is a primary difference between satellite and terrestrial microwave radio systems?
Why is frequency modulation (FM) preferred over amplitude modulation (AM) in microwave radio systems?
Why is frequency modulation (FM) preferred over amplitude modulation (AM) in microwave radio systems?
What is the reason behind using satellite systems for long-distance communication?
What is the reason behind using satellite systems for long-distance communication?
What is the typical range of microwave frequencies?
What is the typical range of microwave frequencies?
What is the significance of dividing a microwave frequency band into a low band and a high band?
What is the significance of dividing a microwave frequency band into a low band and a high band?
What is the approximate wavelength of a 100-GHz microwave signal?
What is the approximate wavelength of a 100-GHz microwave signal?
What was the approximate cost of the first transcontinental microwave radio system built by the Bell System?
What was the approximate cost of the first transcontinental microwave radio system built by the Bell System?
How many relay stations were part of the first transcontinental microwave radio system?
How many relay stations were part of the first transcontinental microwave radio system?
What was the approximate average distance between relay stations in the first transcontinental microwave radio system?
What was the approximate average distance between relay stations in the first transcontinental microwave radio system?
What is the purpose of dividing the allocated bandwidth for the system in half?
What is the purpose of dividing the allocated bandwidth for the system in half?
In a high/low microwave repeater system, what happens if a repeater station receives a low-band RF carrier?
In a high/low microwave repeater system, what happens if a repeater station receives a low-band RF carrier?
What is the significance of ringaround in antenna design?
What is the significance of ringaround in antenna design?
When can multiple carriers of the same frequency be received?
When can multiple carriers of the same frequency be received?
What is the consequence if a transmission from station B is received by station D?
What is the consequence if a transmission from station B is received by station D?
What does a high/low-frequency scheme aim to prevent?
What does a high/low-frequency scheme aim to prevent?
Which wave path is directly between the transmit and receive antennas in a microwave radio system?
Which wave path is directly between the transmit and receive antennas in a microwave radio system?
What is the sum of the free-space path, ground-reflected wave, and surface wave called?
What is the sum of the free-space path, ground-reflected wave, and surface wave called?
Which wave path is the portion of the transmit signal that is returned (reflected) back to Earth's surface by the ionized layers of Earth's atmosphere?
Which wave path is the portion of the transmit signal that is returned (reflected) back to Earth's surface by the ionized layers of Earth's atmosphere?
At what frequency range does the surface wave provide the primary coverage, and the sky wave helps extend this coverage at night?
At what frequency range does the surface wave provide the primary coverage, and the sky wave helps extend this coverage at night?
What factor determines the magnitude of the surface wave in a microwave radio system?
What factor determines the magnitude of the surface wave in a microwave radio system?
Which of the following wave paths does not exist in a microwave radio system?
Which of the following wave paths does not exist in a microwave radio system?
What is the primary function of an IF repeater?
What is the primary function of an IF repeater?
Which type of repeater allows for reconfiguration of the baseband signal?
Which type of repeater allows for reconfiguration of the baseband signal?
In the configuration shown in Figure 4c, what is the purpose of demodulating the RF carrier to baseband?
In the configuration shown in Figure 4c, what is the purpose of demodulating the RF carrier to baseband?
Which statement is true about the baseband signal in a baseband repeater?
Which statement is true about the baseband signal in a baseband repeater?
What is the purpose of up-converting the signal to an RF carrier in a repeater?
What is the purpose of up-converting the signal to an RF carrier in a repeater?
In the context of microwave repeaters, what does the term 'reshaped' refer to?
In the context of microwave repeaters, what does the term 'reshaped' refer to?
