How It Works
A 3 stage TRF receiver includes an RF stage, a detector stage, and an audio stage:
This schematic diagram shows a typical TRF receiver. This particular example uses six triodes. It has two radio frequency amplifier stages, one grid-leak detector/amplifier and three class ‘A’ audio amplifier stages. Generally, two or three RF amplifiers are required to filter and amplify the received signal to a level sufficient to drive the detector stage. The detector recovers the audio frequency signal from the modulated RF signal, and the audio stage amplifies the information signal to a usable level. The final stage was often simply a grid-leak detector.
Read more about this topic: Tuned Radio Frequency Receiver
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