Introduction to Radio Transmission and Reception
It is an instrument that receives the radio signals from the broad casting stations and produce sound. In year 1895, Marconi achieved in telecommunication that is termed as Radio communication.
He confirmed the wireless communication in the year 1901. The most simple radio receiver is the crystal receiver. It was created through Henrich Hertz in 1970. It was intended to work equal to 50 Kilometers. After that, in 1909, the Tuned radio frequency receiver was prepared. Major Armstrong planned a dissimilar type of radio of radio recever in 1917. This receiver is termed as Superheterodyne or shortly superhet receiver. Sensitivity and selectivity of It are high. All of the current radio receiver work within the principle of Superheterodyne. In USA (united state of America), the first regular boaradcast started in the year 1920.
BASIC PRINCIPLE
The principles that are determined in all type of radio receivers are as follows:
1. RECEPTION
For the reception of radio waves an aerial is essential. It provides the connection between the radio waves with the receiver.
2. SELECTION
It is the capability to select a wanted radio station from several radio station. This work is performed through a LC resonant net work.
3. DETECTION
Radio frequency signals are converted into audio frequency signals in this process. It is performed through a crystal diode.
4. REPRODUCTION
The conversion of audio signal into sound is known as reproduction. It is performed through a speaker.
ABILITIES OF RECEIVERS
This speciality and quality of a radio receiver is specified on the basic of the following abilities.
1. SENSITIVITY
It is the ability to generate enough audio output even for weak input radio frequency signal. It relies on the R.F. and I.F amplication abilities.
2. SELECTIVITY
It is the ability to choose only the wanted signal or radio station, from the various signals that are received through the aerial. It relies on precise alignment of the tuned circuits. Therefore converter and R.F amplifier is intended to enhance the selectivity. If selectivity rises, the frequency of image and adjacent channels interference of a receiver decreases.
3. FIDELITY
It is the ability to amplify the total range of audio frequency with no loss. It relies on the design of AF amplifiers.
4. STABILITY
It is the ability to generate stable output with no variation. AVC circuit is employed to generate stability in the sound.
5. SIGNAL TO NOISE RADIO
It is the radio among the signal and noise. A noise limiter stage is employed to enhance this ability.
TYPES OF RADIO RECEIVER
Usually the Radio receivers are categorized into the following two types.
1. TRF Radio receiver
2. Superhet Radio receiver
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