Questions and Answers
In communication, a ______ is defined as 'A physical quantity that varies with time, space or any other independent variable by which information can be conveyed'.
Signal
Analog Signals vary with time without discontinuity and can assume any value within the range of the system, such as the output from a ______.
microphone
Digital signals can only assume limited specified discrete values and consist of patterns of ______.
bits
The unit of frequency is ______ and is denoted as Hz.
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The distance between any two points on a wave having the same amplitude is called ______.
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As the frequency of a wave increases, its ______ decreases.
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In the basic communication model, understanding the capabilities and limitations of each piece of ______ is essential.
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Frequency is defined as the number of cycles a wave completes in one ______.
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Mathematically this relationship may be represented as: f = c / ______ (Where c is the speed of light)
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Voice or the information signal in its basic form is known as the ______ signal.
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Carrier is a high frequency signal on which the base band signal is ______ to transmit it through antenna.
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Modulation is the process of superimposing the baseband on to ______ for the purpose of transmission.
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A carrier wave conveys no information by itself; it's simply a rhythmic stream of continuous ______.
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Voice frequencies are too low to be radiated effectively from an ______.
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A carrier wave is described by three quantities: its amplitude, frequency, and ______.
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Although phase modulation is widely used in digital modulation, it is ______.
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Study Notes
Introduction to General Communication
- Communication is essential for integration within mechanized forces.
- Understanding the basic terminologies and working principles of communication equipment is crucial for effective operation.
Basic Communication Terminologies
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Signal: A physical quantity that varies with time, space, or any independent variable, enabling information conveyance.
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Types of Signals:
- Analog Signals: Continuous variations over time; can represent any value within a system's range (e.g., microphone output).
- Digital Signals: Discrete values or levels represented by patterns of bits (0s and 1s); used for storing and manipulating data like pictures and sound.
Frequency and Wavelength
- Frequency: Number of cycles completed in one second, measured in hertz (Hz).
- Wavelength: Distance between two points on a wave with the same amplitude, or the distance traveled by a wave in one cycle; denoted by the symbol λ.
- Relation: Frequency and wavelength are inversely proportional (f = c / λ), where c is the speed of light.
Baseband and Carrier Signals
- Baseband Signal: The raw form of voice or information; the microphone converts sound waves into an electrical signal to be amplified for transmission.
- Carrier Signal: A high-frequency signal that carries the baseband signal for transmission via antenna; essential for effective communication.
Modulation
- Modulation: The process of superimposing baseband signals (voice, video, data) onto a carrier wave for transmission; the carrier conveys no information without modulation.
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Need for Modulation in Radio Systems:
- Voice frequencies are too low to be effectively radiated from an antenna.
- Modulation allows receivers to select desired transmissions in the presence of multiple signals on similar frequencies.
Modulation Methods
- Analog or digital signals can be modulated onto a carrier wave, which is determined by its amplitude, frequency, and phase.
- Various modulation techniques can be used to vary one of these three quantities for efficient transmission.
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Description
This quiz covers the essential terminologies and working principles of communication equipment used in mechanized units. Understanding these basics is crucial for effective operation and integration within mechanized forces. Test your knowledge on key concepts and improve your communication skills.
