What is the purpose of the radio frequency amplifier in a receiver?

What is the purpose of the radio frequency amplifier in a receiver?

RF amplifier: A sensitive amplifier that amplifies the very weak radio frequency (RF) signal from the antenna so that the signal can be processed by the tuner.

What are the functions of radio receiver?

The principal functions of a radio receiver are frequency selection, amplification, and detection. Frequency selection is the discrimination of the part of the radio-frequency spectrum that contains the desired information from the entire spectrum of electromagnetic oscillations acting on the antenna.

How do you make a radio receiver?

Design of a radio receiver must consider several fundamental criteria to produce a practical result. The main criteria are gain, selectivity, sensitivity, and stability. The receiver must contain a detector to recover the information initially impressed on the radio carrier signal, a process called modulation.

Which of the following is radio receiver characteristic?

Sensitivity of a radio receiver is its ability to respond to weak signal and is expressed as the minimum signal input voltage or power required to produce required output. Fidelity of a radio receiver is its ability to reproduce the signal that appears in its input faithfully in its output.

What determines the selectivity of a receiver?

The selectivity of a receiver is evaluated by that relative intensity of a signal received from an external source, such as a radio station, for which the signal has a marked interfering effect on the reception of a chosen weak signal.

What are the two basic specifications of a receiver?

A radio receiver must perform two basic functions: It must respond to, detect, and demodulate desired signals. It must not respond to, detect, or be adversely affected by undesired signals.

What do you need to know about a radio receiver?

Many receivers include additional filtering and tuning circuits to better lock on to the intended frequency — or to produce better-quality audio output — and exclude other signals. Still, these basic elements are found in most receiver circuits. Doug Lowe still has the electronics experimenter’s kit his dad gave him when he was 10.

How does a radio receiver adjust the frequency?

In simple radio receiver circuits, the tuning is adjusted by varying the number of turns of wire in the coil. More sophisticated tuners use a variable capacitor (also called a tuning capacitor) to vary the frequency. Detector: Responsible for separating the audio information from the carrier wave.

How does the tuning of a radio set work?

The tuning is one of the key areas of any radio set. To see how it works it is necessary to look at the inductor and capacitor L1 and VC1 in the diagram. Together these form a resonant circuit. It provides the receiver with selectivity. The tuned circuit provides a passband within which signals are accepted.

How to design a simple digital radio receiver?

With many new advances in data converter and radio technology, complex receiver design has been greatly simplified. This paper attempts to explain how to calculate sensitivity and selectivity of such a receiver.