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9-1: Basic Principles of Signal Reproduction
Tuned Radio Frequency (TRF) Receiver
In the tuned radio frequency (TRF) receiver sensitivity is improved by adding a number of stages of RF amplification between the antenna and detector, followed by stages of audio amplification.
The RF amplifier stages increase the gain before it is applied to the detector.
The recovered signal is amplified further by audio amplifiers, which provide sufficient gain to operate a loudspeaker.