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Questions and Answers
What is the central frequency of the VCO used in the FM system?
What is the central frequency of the VCO used in the FM system?
- 400 Hz (correct)
- 500 Hz
- 300 Hz
- 200 Hz
What is the purpose of the FM modulator (discriminator) in the receiving station?
What is the purpose of the FM modulator (discriminator) in the receiving station?
- To calibrate the output of the discriminator into a display of 01 to 30001
- To mix multiple oscillators for radio transmission
- To modulate the frequency of a voltage-controlled subcarrier oscillator
- To sense frequency variations and convert them into appropriate voltage (correct)
What is the range of frequency variation for the output of the VCO in the FM system?
What is the range of frequency variation for the output of the VCO in the FM system?
- 350 Hz to 450 Hz
- 380 Hz to 420 Hz
- 370 Hz to 430 Hz (correct)
- 360 Hz to 440 Hz
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Study Notes
- An FM system is used for RF telemetry applications.
- The output of each transducer modulates the frequency of a voltage-controlled subcarrier oscillator.
- Multiple oscillators are mixed for radio transmission.
- FM modulator (discriminator) is used at the receiving station.
- The discriminator output voltage changes as the measurement value changes.
- The VCO operates at a central frequency of 400 Hz and deviates +7.5% from the central frequency.
- The output of VCO varies between 370 Hz and 430 Hz.
- The discriminator senses frequency variations and converts them into appropriate voltage.
- The output of the discriminator is calibrated into a display of 01 to 30001.
- This system can be used to indicate the liquid level in a tank located far away.
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