LESSON 4
DESCRIBE AND IDENTIFY THE PRINCIPLES OF RADIO AND
LINE TRANSMISSION, AM/FM CHARACTERISTICS, STEREO PHASE
PROBLEM, AND THE ELECTRONIC REQUIREMENTS OF RADIO RECEIVERS
TASK
Describe and identify the principles of radio and line transmission, characteristics of AM and FM stereo
phase problems and the electronic requirements of radio receivers.
CONDITIONS
Given information and illustrations relating to principles of radio line transmissions, AM and FM
characteristics, stereo phase problems and electronic requirements and radio receiver.
STANDARDS
Demonstrate competency of the task skills and knowledge by correctly responding to 80% of the
multiple-choice test covering principles of radio line transmission, AM and FM characteristics, stereo
phase problems, and electronic requirements of radio receivers.
REFERENCES
None
Learning Event 1:
DESCRIBE AND IDENTIFY THE PRINCIPLES OF RADIO AND LINE TRANSMISSIONS
1.
Transmission of sound. Radio communications include transmission of signals through space to
a point of reception from a point of origin not connected by wires. This is accomplished by the use of
microphones to convert sound waves into patterns of electrical energy. This energy is amplified and
modulated by transmitting apparatus and broadcast on radio frequencies into the air. At the point of
reception, the electrical patterns are converted by sound waves, which emerge from the loudspeaker.
2.
Modulate. To modulate means to regulate or adjust within a communication system, modulation
has three very important functions.
a. It converts electrical signals from information; it sends multiple channels of information over
one communication line (multiplexing) and it makes radio transmission possible.
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