What is high level Amplitude Modulation?
What is high level Amplitude Modulation?
In High level Amplitude Modulation system, Modulation is done at high power of carrier and modulating signals so Power amplifiers are used to boost the carrier and modulating signals before modulation. Collector modulation method is the example of High level Amplitude Modulation.
What is the high level modulation?
High level modulation occurs when the modulating voltage is applied to the collector/plate circuit of the final power amplifier. With high level modulation, the final stage is operated class C and the preceding stages are also operated class C. The overall efficiency of such a transmitter is very high.
What is the difference between high and low level modulations?
Low level modulation is generating AM wave with small signal which must be amplified before transmission. High level modulation is generating AM wave with high power levels in the final stage of transmitter.
What is high and low level Amplitude Modulation?
The low level transmitter circuit does not require a large AF modulator power so its design is simplified. However the overall efficiency is much lower compared to high level modulation. This is due to the use of less efficient linear amplifiers.
What is the cause of over modulation?
When the input telecommunication exceeds the required value, it results in over modulation. Over modulation can take place in both AM and FM systems.
What is the result of over modulation?
Overmodulation results in spurious emissions by the modulated carrier, and distortion of the recovered modulating signal. This means that the envelope of the output waveform is distorted.
What are the advantages and disadvantages of amplitude modulation?
Advantages and Disadvantages of Amplitude Modulation
| Advantages | Disadvantages |
|---|---|
| Amplitude Modulation is easier to implement. | When it comes to power usage it is not efficient. |
| Demodulation can be done using few components and a circuit. | It requires a very high bandwidth that is equivalent to that of the highest audio frequency. |
What is the block diagram for high level modulation?
The image below is the block diagram of high level amplitude modulation. As this is high level amplitude modulation, therefore it uses a high level AM modulator which operates at high level. Before applying the message signal and the carrier wave to the high-level AM modulator, both of these signals are amplified.
How is the wideband used in high level modulation?
The wideband is used to preserve the sidebands of the amplitude modulated wave and then it is transmitted with the help of this antenna. The image below is the block diagram of high level amplitude modulation. As this is high level amplitude modulation, therefore it uses a high level AM modulator which operates at high level.
How to draw block diagram of amplitude modulated radio transmitter?
Draw the block diagram of Amplitude Modulated (AM) Radio transmitter. Draw the block diagram of Amplitude Modulated (AM) Radio transmitter. Fig gives the block diagram of amplitude modulated radio transmitter. It consists of two sections (i) Audio frequency (AF) section and (ii) Radio frequency (RF) section.
Why do we use a high level AM modulator?
As this is high level amplitude modulation, therefore it uses a high level AM modulator which operates at high level. Before applying the message signal and the carrier wave to the high-level AM modulator, both of these signals are amplified.