20 Questions
What is the main function of a demultiplexer?
Separate data according to frequency band
Which type of multiplexing is used with analog signals?
Frequency division multiplexing (FDM)
What is the purpose of a guard band in FDM?
To prevent interference between channels
In the example given, where does the third voice channel occupy the bandwidth?
28-32 kHz
What provides most of the gain and narrowband filtering for a superheterodyne receiver?
The IF band-pass filter and amplifier
What is the process called when an analog audio signal modulates the amplitude of a carrier?
Amplitude Modulation (AM)
Which technique of modulating a radio wave is superior because it produces better fidelity with much higher noise immunity?
Frequency Modulation (FM)
What electronic circuit produces a sine wave at a specific frequency to create the RF carrier?
Oscillator
What is the transmission of information from more than one source to more than one destination over the same transmission medium called?
Multiplexing
What makes FM modulation superior to AM modulation in terms of noise immunity and fidelity?
Modulating the frequency of the carrier
What is the process called when a carrier is modulated by an analog audio signal to vary its amplitude?
Amplitude modulation (AM)
Which type of modulation is considered superior due to its ability to produce better fidelity and higher noise immunity?
Frequency modulation (FM)
What is the function of a multiplexer in the context of radio broadcasting?
To combine data from multiple input lines and transmit over a higher-capacity data link
What electronic circuit is responsible for producing a sine wave at a specific frequency to create the RF carrier?
Oscillator
Which modulation technique involves modulating the frequency of a carrier using an analog audio signal?
Frequency modulation (FM)
What is the minimum bandwidth required for multiplexing five 100 kHz channels with a 10 kHz guard band between each channel?
540 kHz
In frequency division multiplexing (FDM), what provides most of the gain and narrowband filtering for the radio?
The IF band-pass filter and amplifier
What is the process called when a demultiplexer separates (demultiplexes) the data according to channel and delivers data to the appropriate output lines?
Deplexing
Which type of modulation is used to change the incoming radio frequency signal to a higher or lower, fixed, intermediate frequency (IF) in a superheterodyne receiver?
Amplitude modulation (AM)
What makes frequency division multiplexing (FDM) inflexible when compared to other multiplexing techniques?
Waste of bandwidth if traffic distributed unevenly
Test your knowledge of radio broadcasting modulation techniques with this quiz. Learn about point to point transmission, modulating radio waves with audio signals, and the differences between amplitude modulation (AM) and frequency modulation (FM).
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