What is TRF in radio?

A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier.

What are the disadvantages of TRF receiver?

Disadvantages of TRF receiver Poor selectivity and low sensitivity in proportion to the number of tuned amplifiers used. Selectivity requires narrow bandwidth, and narrow bandwidth at a high radio frequency implies high Q or many filter sections.

Why many RF amplifiers are used in TRF receiver?

The detector requires a strong signal to work properly, so a high gain is required before it. In a TRF receiver all amplification is done at the incoming signal frequency, so it needs multiple RF amplifiers.

What amplifies the radio signal in a TRF receiver?

Fig shows the block diagram of Tuned Radio Frequency TRF receiver. The received signal is weak and noisy. It is given to broadband RF amplifier. The RF amplifier enhances signal to noise ratio and amplifies the signal.

What are the receiver parameters?

The parameters of the AM Receivers are Sensitivity, Selectivity, Fidelity, Image frequency rejection etc.

What are the advantages of TRF?

Its advantages are its simplicity and high sensitivity. Two or perhaps three RF amplifiers, all tuning together, were employed to select and amplify the incoming frequency and simultaneously to reject all others.

What is image frequency in radio receiver?

In heterodyne receivers, an image frequency is an undesired input frequency equal to the station frequency plus (or minus) twice the intermediate frequency. The image frequency results in two stations being received at the same time, thus producing interference.

What is fidelity in radio receiver?

Fidelity of a receiver is its ability to reproduce the exact replica of the transmitted signals at the receiver output. In other words, the fidelity of a receiver is its ability to accurately reproduce, in its output, the signal that appears at its input.

What is intermediate frequency in radio?

In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception.