Master FM Telemetry Systems

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Questions and Answers

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?

  • 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?

  • 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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