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Explain how the FM system works in RF telemetry applications.
Explain how the FM system works in RF telemetry applications.
In an FM system 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. At the receiving station, an FM modulator (discriminator) is used, which senses frequency variations and converts them into an appropriate voltage. The output of the discriminator is calibrated into a display of 01 to 30001.
True or false: The FM system described in the text is used for audio broadcasting applications.
True or false: The FM system described in the text is used for audio broadcasting applications.
False (B)
What is the central frequency of the VCO in the FM system?
What is the central frequency of the VCO in the FM system?
The VCO operates at a central frequency of 400 Hz, and it deviates +7.5% from the central frequency. The output of the VCO varies between 370 Hz and 430 Hz.
True or false: The VCO in the FM system has a frequency range of 370 Hz to 430 Hz.
True or false: The VCO in the FM system has a frequency range of 370 Hz to 430 Hz.
How can the FM system be used to indicate the liquid level in a tank located far away?
How can the FM system be used to indicate the liquid level in a tank located far away?
True or false: The discriminator in the FM system converts voltage variations into appropriate frequency.
True or false: The discriminator in the FM system converts voltage variations into appropriate frequency.
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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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