Chapter 10: Wireless Radio Systems Flashcards
Which of the following is NOT a key term directly related to wireless radio systems as defined in the text?
c) Fiber Optics
Fiber optics are wired, not wireless.
What is the minimum carrier signal frequency required for transmitting information with a 100 kHz signal?
b) 200 kHz
The carrier frequency must be at least double the information frequency.
What is the primary function of a transmitter in a wireless communication system?
b) To convert incoming signals into modulated RF carrier signals.
What characteristic of radio waves makes them less suitable for penetrating obstacles like walls?
a) Higher frequencies.
Shorter wavelengths, which correspond to higher frequencies, are more easily blocked.
Which organization is responsible for regulating radio frequencies globally?
c) International Telecommunication Union (ITU)
Why is it crucial to consult local authorities regarding radio frequency usage?
c) To ensure compliance with regulations and optimize usage.
What type of antenna is best suited for point-to-point communication due to its high signal gain?
c) Parabolic Antenna
What is a significant advantage of vertical antennas?
b) Their compact size and omnidirectional radiation pattern.
At what frequencies are parabolic antennas most effective?
b) Above 1 GHz
What is the typical polarization of a vertical antenna?
d) Vertical
What is the ideal length of a highly efficient vertical antenna in relation to the signal’s wavelength?
c) A quarter of the wavelength
What is the purpose of a ground plane in relation to a vertical antenna?
b) To improve radiation efficiency and performance.
What phenomenon does a diversity system aim to mitigate?
c) Signal cancellation from direct and reflected signals
How does a diversity receiver improve audio quality?
c) By dynamically selecting the strongest signal.
Which of the following is NOT a common application of wireless radio systems?
a) Wired network connections
What does the term ‘wireless’ encompass?
b) Any signal transmitted without wires or fiber optics.
What is the frequency range of radio waves?
d) 3 kHz to 300 GHz
Which of the following best describes ‘radio’ in the context of the text?
c) The waves themselves.
What is the role of an antenna in a wireless communication system?
c) To transmit and receive radio signals.
What is a key consideration when configuring antennas?
c) Antenna orientation.
What does RF stand for?
a) Radio Frequency
How do radio waves propagate?
c) In straight lines.
What is the relationship between wavelength and the ability of radio waves to penetrate obstacles?
a) Longer wavelengths penetrate better.
Which of the following is an example of a diversity system application?
b) Enhancing the reliability and audio quality of a wireless microphone system.
