✨ BASIC REQUIREMENTS OF RADIO COMMUNICATION
Modern radio communication consists of transmittin g electromagnetic waves into space,
a portion of which are intercepted at receiving end and the information or intelligence is recovered back, out of intercepted radio waves.
In the process of radio communication, transmitter generates radio frequencies (R.F.) energy of a particular frequency which is interrupted in accordance to Morse Code in continuous wave (C.W.) in radiotelegraphy or the intelligence in the form of audio-frequency (A.F.) waves converted by microphone from sound waves into electrical waves are superimposed in accordance with amplitude or frequency of A.F. waves on it, .in radiotelephony. The resulting waves available at the output of the transmitter are transferred to a radiating system (transmitting antenna) through a system known as transmitting line with minimum or no loss. The radio waves carrying intelligence are radiated by the transmitting antenna in the form of electromagnetic (radio) waves into free space which propagate with velocity of light (3 x 108 metre/seconds).
At receiving end, some of these radio waves are intercepted by receiving antenna and are fed to receiver for selection, amplification and detection of desired intelligence. At the output of the receiver, desired intelligence is still in the form of A.F. waves (electrical energy not hearable to
human ears) which is converted back to sound waves by loudspeaker 0r headphone and thus the transmitted information or intelligence is heard at the receiving end.
Concluding, the basic requirements of any system of radio communication are : (1') A Transmitter. To generate a high-frequency carrier (radio frequency waves).
(ii) A Microphone or Telegraphy Key. To 1mpress the intelligence upon the high-frequency carrier.
(iii) A Transmitting Antenna. To radiate the high-frequency carrier with intelligence impressed on it, into free space.
(iv) A Receiving Antenna. To intercept a portion of the radiated electromagnetic (radio) waves travelling in free space.
(v) A Receiver. To select the desired waves, to magnify the intercepted radio waves and to detect the intelligence contained in the transmitted radio waves.
(vi) A Loudspeaker or Headphone. To convert the detected A.F. electrical waves into sound
waves and thus to reproduce back the original intelligence transmitted from the transmitting end. ,
These basic requirements of radio communication system are represented schematically in Fig. 1.1.
Although the picture (Fig. 1.1) is very rough and in actual practice many more significant details have to be included which are extremely essential in the understanding of the process of radio
communication, yet it is the basic requirement of any radio communication system.
The process of radio communication is a complex process and each section (outlined above) has its own right to be dealt with in considerable detail.
Modern radio communication consists of transmittin g electromagnetic waves into space,
a portion of which are intercepted at receiving end and the information or intelligence is recovered back, out of intercepted radio waves.
In the process of radio communication, transmitter generates radio frequencies (R.F.) energy of a particular frequency which is interrupted in accordance to Morse Code in continuous wave (C.W.) in radiotelegraphy or the intelligence in the form of audio-frequency (A.F.) waves converted by microphone from sound waves into electrical waves are superimposed in accordance with amplitude or frequency of A.F. waves on it, .in radiotelephony. The resulting waves available at the output of the transmitter are transferred to a radiating system (transmitting antenna) through a system known as transmitting line with minimum or no loss. The radio waves carrying intelligence are radiated by the transmitting antenna in the form of electromagnetic (radio) waves into free space which propagate with velocity of light (3 x 108 metre/seconds).
At receiving end, some of these radio waves are intercepted by receiving antenna and are fed to receiver for selection, amplification and detection of desired intelligence. At the output of the receiver, desired intelligence is still in the form of A.F. waves (electrical energy not hearable to
human ears) which is converted back to sound waves by loudspeaker 0r headphone and thus the transmitted information or intelligence is heard at the receiving end.
Concluding, the basic requirements of any system of radio communication are : (1') A Transmitter. To generate a high-frequency carrier (radio frequency waves).
(ii) A Microphone or Telegraphy Key. To 1mpress the intelligence upon the high-frequency carrier.
(iii) A Transmitting Antenna. To radiate the high-frequency carrier with intelligence impressed on it, into free space.
(iv) A Receiving Antenna. To intercept a portion of the radiated electromagnetic (radio) waves travelling in free space.
(v) A Receiver. To select the desired waves, to magnify the intercepted radio waves and to detect the intelligence contained in the transmitted radio waves.
(vi) A Loudspeaker or Headphone. To convert the detected A.F. electrical waves into sound
waves and thus to reproduce back the original intelligence transmitted from the transmitting end. ,
These basic requirements of radio communication system are represented schematically in Fig. 1.1.
Although the picture (Fig. 1.1) is very rough and in actual practice many more significant details have to be included which are extremely essential in the understanding of the process of radio
communication, yet it is the basic requirement of any radio communication system.
The process of radio communication is a complex process and each section (outlined above) has its own right to be dealt with in considerable detail.
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