What is plate modulation?
: modulation in radio in which the modulating voltage is introduced into the plate circuit of the tube which provides the carrier.
What is the advantage of Class C amplifier?
➢ The Class C amplifier is used in the applications like RF oscillators, RF amplifier, FM transmitters, Booster amplifiers, High frequency repeaters and Tuned amplifiers. ➢ The main advantage of the Class C amplifier is, it has a Lowest physical size for a given power output.
What is modulating amplifier?
[′mäj·ə‚lād·əd ′am·plə‚fī·ər] (electronics) Amplifier stage in a transmitter in which the modulating signal is introduced and modulates the carrier.
What is base modulator?
[′bās ‚mäj·ə′lā·shən] (electronics) Amplitude modulation produced by applying the modulating voltage to the base of a transistor amplifier.
What are the fundamental differences between Class A and Class C amplifiers?
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| Class | A | C |
|---|---|---|
| Operating Cycle | 3600 | Less than 1800 |
| Position of Q point | Center of load line | Below X-axis |
| Efficiency | Poor, 25% to 50% | High |
| Distortion | Absent No distortion | Highest |
What is the maximum efficiency of Class C amplifiers?
Theoretical maximum efficiency of a Class C amplifier is around 90%. Due to the huge amounts of distortion, the Class C configurations are not used in audio applications.
What is difference between modulator and amplifier?
Amplifier is a circuit which converts a small signal in to a large signal. In amplification frequency remains constant ,amplitude magnified. The purpose of modulation is to vary the frequency so that signal can be transmitted properly.
What is the use of SSB?
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently.
How is a modulator related to a Class C amplifier?
The modulator is a linear power amplifier that takes the low level modulating signal and amplifies it to a high power level. The modulating output signal is coupled through modulation transformer T1 to the class C amplifier.
How is the grid of Class C amplifier controlled?
-Ve bias of the grid of class C amplifier is controlled by the RF driver transformer. Due to which plate current, varies in accordance to the RF. In this way, the RF is superimposed on AF and the amplitude modulated signal is coupled to the load through the tuned transformer.
How is the AF voltage applied in a Class C amplifier?
The audio voltage (AF) is placed in series with the plate supply voltage +Vbb of a class C amplifier. In actual circuits as shown in figure, how this condition is obtained? AF signal is applied to the AF driver transformer which varies the grid bias of both triodes in accordance to the message signal.
How is the amplitude of a plate modulator determined?
The RF input voltages are superimposed on the total bias. The resulting plate flows in pulses, the amplitude of each pulse being proportional to the instantaneous bias and therefore to the instantaneous modulating voltage. The application of these pulses to the tuned tank circuit will give amplitude modulation.