A typical 50,000 watt AM broadcast transmitter will generally have several low p

Question

A typical 50,000 watt AM broadcast transmitter will generally have several low power audio amplifier stages, a high power (~25,000 watt) audio output stage to generate the audio power that modulates the RF carrier, low power RF stages to generate the carrier signal, and a very high power RF amplifier to generate the unmodulated RF carrier. Discuss the applicability of various amplifier classes to two or more of these applications. Why might one class of amplifier or the other be the best choice for each circuit?

Explanation / Answer

Low power audio amplifier for generating the carrier signal:

low power amplifier is used because we want lesser noise in this case.

low power amplifier is used because low power means lesser the cost and we also want the signal to be decoded at low power so less cost there too.(since it is a brodcast there will be only one transmitter and several receivers)

High power RF amplifier to generate the unmodulated RF carrier:

We want the signal to reach as far as we can so we use a high power unmodulated RF carrier(because it's a transmission)

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