Electronic Communication System By Wayne Tomasi
Elementary Doublet The simplest type of antenna. Students with previous knowledge in basic electronic principles and fundamental calculus concepts will gain a complete understanding of the topics presented here. Refractive index Simply the ratio of velocity of propagation of a light ray in free space to the velocity of propagation of a light ray in a given material.
Base Station Another name for cell-site controller. Used for most two-way radio communications. Incident voltage Voltage t hat propagates from the source toward the load. Sky waves Used for high-frequency applications. Midtread Quantization A way to reduce idle channel noise wherein the first quantization interval is made larger in amplitude than the rest of the steps.
Also developed the superheterodyne receiver. Types of Dispersion Material or Chromatic or Wavelength Dispersion light sources emit light that contains a combination of wavelengths. Ground losses vary considerably with surface material and composition. Piezoelectric Effect Occurs when oscillating mechanical stresses applied across a crystal lattice structure generate electrical oscillations and vice versa.
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Tank circuit operation involves an exchange of energy between kinetic and potential. Iridium Project The largest commercial venture undertaken in the history of the world. Coaxial Used for high dat a transmission rates to reduce losses and isolate transmission path.
Control Channel It is used for transferring control and diagnostic information between mobile users and a central cellular telephone switch through a base station. Differential Phase Shift Occurs when different frequencies undergo different phase shifts and ay have a detrimental effect on a complex waveform. Cooling process of glass irregularities, imperfections such as tiny bubbles, and imperfections in the internal uniformity causing light rays to be diffracted dispersed or to escape. Sometimes called balanced lattice modulator.
Used in heat seeking guidance systems, electronic photography, and astronomy. Thermal Noise Associated with the rapid and random movement of electrons within a conductor due to thermal agitation. The number of modes a fiber can transmit depend on its numerical aperture as well as the wavelength. Sporadic E layer The upper portion of the E layer.
Internet A public data communications network used by millions of people all over t he world to exchange business and personal information. Cellular Telephone It is similar to two-way mobile radio in that most communications occurs between base stations and mobile units. Transmission line Metallic conductor system used to transfer electrical energy from one point to another using electrical current flow. Fundamentals Through Advanced by Wayne Tomasi. Wayne Tomasi, pitbull fights videos DeVry Institute.
Reeves invents binary coded pulse-code modulation. Angle of Incidence Angle formed between the incident wave and the normal. Demodulator Demodulation is performed in a receiver by a circuit called? Co-channel Interference The interference between the co-channels cells.
Trench Considered as transmission medium. Line of Shoot or Point of Shoot The line bisecting the major lobe, or pointing from the center of the antenna in the direction of maximum radiation. Secondary constants Transmission characteristics of a transmission line.
Percent Modulation The coefficient of modulation stated as a percentage. Burst Mode Data are input and output for a single channel in a short burst. Alexander Graham Bell and Thomas A.
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Dispersion Spreading of pulse out in the time domain, changing its shape so that it may merge into the previous and succeeding pulses. Directly Proportional The relationship of captured power to the received power density and the effective capture area of the received antenna. Parallel-conductor transmission lines and coaxial transmission lines.
Index of Modulation Peak Phase Deviation is sometimes called? Heterodyning and Frequency Multiplication Two basic methods of performing frequency up-conversion. Space attenuation Spherical spreading of the wave. Index Profile A graphical representation of the refractive index of the core. Mutual Inductance Ability of one coil to induce a voltage in another coil.
Completion Execution Unnecessary network resources are relinquished and made available to other mobile units. Angle of refraction Angle formed between the propagating ray and the normal after the ray has entered the second medium. Open-loop Voltage Gain Is the voltage gain of the amplifier with the feedback path open circuited. Standing wave Two travelling waves set up an interference pattern.
Hartley Oscillator Is an oscillator circuit comprising of two inductors connected in series and capacitor that is connected in parallel with the two inductors. Unmatched or mismatched line I ncident power returned reflected to the source. Frequency Division Multiplexing Multiple sources that originally occupied the same frequency spectrum are each converted to a different frequency. Infrared Absorption photons of light absorbed by atoms of the glass core are converted to mechanical vibrations typical of heating.
Multiplexing The process of combining transmissions from more than one source and transmitting them over a common facility, such as metallic or optical fiber cable or a radio-frequency channel. Loading Adding inductors periodically in series with the wire. Trunks or Interoffice Trunk Telephone switching machines in local exchanges are connected to other local exchange office. Intermediate Frequency Refer to frequencies that are used within a transmitter or receiver that fall somewhere between the radio frequencies and the original source information frequencies.
Semirough surfaces Surfaces that falls between smooth and irregular. Adjacent Channel Interference The highest side frequencies from one channel are allowed to spill over into adjacent channels, producing an interference known as? Initiation Either the mobile unit or the network determines the need for a handoff and initiates the necessary network procedures. Types of Laser Gas Laser use a mixture of helium and neon enclosed in a glass tube.
We don't recognize your username or password. Cosmic Noise Noise sources that are continuously distributed throughout the galaxies. Sir William Cooke Allegedly invented the first telegraph in England. Forward Links Transmissions from base station to mobile units. Reflection Coefficient Ratio of the reflected to the incident voltage intensities.
Licuanan who assisted and taught them the necessary information in order to correctly summarize the Electronic Communications Systems by Wayne Tomasi. Shot Noise Noise caused by the random arrival of carriers holes and electrons at the output element of an electronic device. Information Theory A highly theoretical study of the efficient use of bandwidth to propagate information through electronic communications systems.
Pre-coder Performs level conversion and then codes the incoming data into groups of bits that modulate an analog carrier. Longitudinal currents Currents that flow in the same direction.
Comprehensive in scope and contemporary in coverage, this text introduces basic electronic and data communications fundamentals and explores their application. Strength member Increases the tensile strength of the overall cable assembly.
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