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Home Knowledge Base

Basic of Tuned Radio Frequency Receiver : TRF and Limitations

Nikita Bisen by Nikita Bisen
September 13, 2022
in Knowledge Base
0

The TRF, tuned radio frequency radio receiver was widely used in the early days of radio, but is hardly used today

  • This receiver was popular in the 1920s and a TRF is a type of radio receiver that is controlled by one or more RF amplifier stages followed by a detector circuit to extract the audio signal and usually an audio frequency amplifier.
  • Early models could be uninteresting to operate because when tuning in a station each stage had to be individually adjusted to the station’s frequency.
  • But now latest models had ganged tuning, the tuning mechanisms of all stages being linked together, and operated by just one control knob.
  • In the 1930’s it was replaced by the superheterodyne receiver patented by Edwin Armstrong.
Block Diagram of TRF Receiver
  • It consisted of three section RF amplifier, demodulator, and audio amplifier.
  • The signal received from the antenna is weak and noisy so this signal is given to a broadband RF amplifier.
  • This RF amplifier enhances the signal-to-noise ratio and amplifies the signal. Then this signal passed through AM detector or demodulator.
  • The output of AM detector or demodulator is an audio signal. The detected audio signal is then amplified by the audio power amplifier.
  • The audio amplifier output give to the speaker and then it finally produces the sound.
  • The RF amplifier is tuned to a specific frequency that is to be received. Hence if another frequency is to receive, then another TRF receiver should be used.
  • By using the RF amplifier tuned to a wide range of frequencies this problem is solved. But this reduces the selectivity of the receiver.

Advantages of TRF Receiver

  • Simplest type of receiver since it does not involve mixing and IF operation.
  • Very much suitable to receive single frequency.
  • TRF receivers have good sensitivity.

Disadvantages of TRF Receiver

  • Bandwidth changes with center frequency, when the TRF receiver is used to receive a wide range of frequencies.
  • Multiple stages of RF amplifiers are used. This can lead to instability since they all are tuned to the same center frequency. Hence stagger tuning is to be used.
  • The gain of the TRF receiver is not uniform over a wide range of frequencies.

Application of TRF Receiver

  • It was used in the early days of wire-less technology but it is rarely used today as other techniques offering much better performance are available.

Limitations of TRF Receiver

  • It suffers from variations in BW over the tuning range ( s 40 – 1650 kHz).
  • The gain of TRF RX is not uniform over the tuning range.
  • The TRF is unstable at high frequency.
  • Gang tuning of more capacitors simultaneously is difficult.
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Nikita Bisen

Nikita Bisen

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