What are the three important sections of high level AM transmitter?
In broadcast transmitters, where the transmitting power may be of the order of kilowatts, high level modulation is employed….The various sections of the figure (a) are:
- Carrier oscillator.
- Buffer amplifier.
- Frequency multiplier.
- Power amplifier.
- Audio chain.
- Modulated class C power amplifier.
What is high level modulation?
High-Level modulators: This type of modulator is defined by one which modulates a high-power section of the circuit (RF amplifier). The advantage is that those linear amplifiers are not required for amplification stages. The drawbacks are that high power audio amplifiers are required.
What are the main requirements of AM broadcast transmitters along with block diagram?
The block diagram of AM transmitter is shown in the following figure. The working of AM transmitter can be explained as follows. The audio signal from the output of the microphone is sent to the pre-amplifier, which boosts the level of the modulating signal. The RF oscillator generates the carrier signal.
What do you understand by high level AM?
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 difference between high level modulation and low level 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 type of processing is required for AM transmitter?
In modern radio systems, modulated signals are generated via digital signal processing (DSP).