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Questions and Answers
What is the main function of a demultiplexer?
What is the main function of a demultiplexer?
- Demodulate the audio or other modulation
- Provide initial selectivity for the radio signal
- Combine modulated signals
- Separate data according to frequency band (correct)
Which type of multiplexing is used with analog signals?
Which type of multiplexing is used with analog signals?
- Time division multiplexing (TDM)
- Frequency division multiplexing (FDM) (correct)
- Space division multiplexing (SDM)
- Code division multiplexing (CDM)
What is the purpose of a guard band in FDM?
What is the purpose of a guard band in FDM?
- To demodulate the audio or other modulation
- To combine modulated signals
- To provide initial selectivity for the radio signal
- To prevent interference between channels (correct)
In the example given, where does the third voice channel occupy the bandwidth?
In the example given, where does the third voice channel occupy the bandwidth?
What provides most of the gain and narrowband filtering for a superheterodyne receiver?
What provides most of the gain and narrowband filtering for a superheterodyne receiver?
What is the process called when an analog audio signal modulates the amplitude of a carrier?
What is the process called when an analog audio signal modulates the amplitude of a carrier?
Which technique of modulating a radio wave is superior because it produces better fidelity with much higher noise immunity?
Which technique of modulating a radio wave is superior because it produces better fidelity with much higher noise immunity?
What electronic circuit produces a sine wave at a specific frequency to create the RF carrier?
What electronic circuit produces a sine wave at a specific frequency to create the RF carrier?
What is the transmission of information from more than one source to more than one destination over the same transmission medium called?
What is the transmission of information from more than one source to more than one destination over the same transmission medium called?
What makes FM modulation superior to AM modulation in terms of noise immunity and fidelity?
What makes FM modulation superior to AM modulation in terms of noise immunity and fidelity?
What is the process called when a carrier is modulated by an analog audio signal to vary its amplitude?
What is the process called when a carrier is modulated by an analog audio signal to vary its amplitude?
Which type of modulation is considered superior due to its ability to produce better fidelity and higher noise immunity?
Which type of modulation is considered superior due to its ability to produce better fidelity and higher noise immunity?
What is the function of a multiplexer in the context of radio broadcasting?
What is the function of a multiplexer in the context of radio broadcasting?
What electronic circuit is responsible for producing a sine wave at a specific frequency to create the RF carrier?
What electronic circuit is responsible for producing a sine wave at a specific frequency to create the RF carrier?
Which modulation technique involves modulating the frequency of a carrier using an analog audio signal?
Which modulation technique involves modulating the frequency of a carrier using an analog audio signal?
What is the minimum bandwidth required for multiplexing five 100 kHz channels with a 10 kHz guard band between each channel?
What is the minimum bandwidth required for multiplexing five 100 kHz channels with a 10 kHz guard band between each channel?
In frequency division multiplexing (FDM), what provides most of the gain and narrowband filtering for the radio?
In frequency division multiplexing (FDM), what provides most of the gain and narrowband filtering for the radio?
What is the process called when a demultiplexer separates (demultiplexes) the data according to channel and delivers data to the appropriate output lines?
What is the process called when a demultiplexer separates (demultiplexes) the data according to channel and delivers data to the appropriate output lines?
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?
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?
What makes frequency division multiplexing (FDM) inflexible when compared to other multiplexing techniques?
What makes frequency division multiplexing (FDM) inflexible when compared to other multiplexing techniques?
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