What is a low level AM modulator?
Low level modulator: A low level AM modulator would be one where the modulation is applied to low power stage of the transmitter, typically in the RF generation stages, or via the digital signal processing areas. The drawback of this approach is that linear amplification is required for the RF stages.
What is the difference between high and low level modulations?
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 difference between low level and high level AM transmitter?
These are known as low and high level modulation. They’re easy to identify: A low level AM transmitter performs the process of modulation near the beginning of the transmitter. A high level transmitter performs the modulation step last, at the last or “final” amplifier stage in the transmitter.
What are the two types of modulator in AM?
There are three main types of amplitude modulation….Types of Amplitude Modulation
- Double sideband-suppressed carrier modulation (DSB-SC).
- Single Sideband Modulation (SSB).
- Vestigial Sideband Modulation (VSB).
What makes an AM modulator a high level modulator?
High level modulator: A high level modulator is defined as one that modulates a high power section of the circuit, typically the final RF amplifier. It has the advantage that linear amplifiers are not required for the RF amplification stages after AM modulation has been applied. The drawback is that high power audio amplifiers are needed.
How does a low level modulation block work?
At its first input we apply the modulating signal source (message signal) and it’s second input is supplied by the RF carrier oscillator. Since it is low level amplitude modulation therefore before applying the modulating signal to the low level AM modulator, we do not amplify it. In the same way, RF carrier is also not amplified.
How is a low level modulation wave amplified?
But when we get the amplitude modulated wave at the output of this low level AM modulator, then it is amplified by the wide band power amplifier. This wideband power amplifier amplifies the power level of the amplitude modulated wave.
Which is most stable low level or high level modulation?
Low level modulation: The block diagram of a low level AM transmitter is shown below. The RF crystal oscillator is most stable mechanical device suitable to generate high frequency carrier signal of particular frequency. The amplified modulating signal is applied to the modulator signal along with carrier.
