3 Questions
What is the central frequency of the VCO used in the FM system?
400 Hz
What is the purpose of the FM modulator (discriminator) in the receiving station?
To sense frequency variations and convert them into appropriate voltage
What is the range of frequency variation for the output of the VCO in the FM system?
370 Hz to 430 Hz
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.
Test your knowledge on FM telemetry systems and their components with this quiz. Learn about how transducers modulate subcarrier oscillators and how FM modulators at receiving stations convert frequency variations into voltage. See if you can identify the central frequency and frequency deviation of a VCO and understand how a discriminator converts frequency variations into a display of liquid levels in a tank. Sharpen your skills on this important technology for RF telemetry applications.
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