What is transmitter and its function?
The purpose of most transmitters is radio communication of information over a distance. The transmitter combines the information signal to be carried with the radio frequency signal which generates the radio waves, which is called the carrier signal. This process is called modulation.
What is the advantage and disadvantage of the FM?
Advantages and Disadvantages of Frequency Modulation
| Advantages | Disadvantages |
|---|---|
| Power Consumption is less as compared to AM. | More complicated receiver and transmitter |
| Adjacent FM channels are separated by guard bands. | The antennas for FM systems should be kept close for better communication. |
How are radio waves generated in a FM transmitter?
To generate the radio frequency carrier waves the FM transmitter circuit requires an oscillator. The tank circuit is derived from the LC circuit to store the energy for oscillations. The input audio signal from the mic penetrated to the base of the transistor, which modulates the LC tank circuit carrier frequency in FM format.
What does deviation mean in a FM transmitter?
deviation — the amount of frequency swing above and below the FM transmitter carrier frequency when modulating voltage is applied to the low-level RF energy. FM — frequency modulation. modulator — a circuit designed to add information to a carrier. modulation index pertains to an FM or PM transmitter.
What’s the difference between a FM transmitter and an AM transmitter?
FM Transmitter vs AM Transmitter The difference between the two is how the intelligence or modulation is superimposed on the carrier (or radio signal). In an AM system, the carrier is modulated up and down in amplitude while the frequency remains constant.
How is a variable capacitor used in a FM transmitter?
The variable capacitor is used to change the resonant frequency for fine modification to the FM frequency band. The modulated signal from the antenna is radiated as radio waves at the FM frequency band and the antenna is nothing but copper wire of 20cm long and 24 gauge.