In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide. Impedance mismatches result in standing waves along the transmission line, and SWR is defined as the ratio of the partial standing wave's amplitude at an antinode (maximum) to the amplitude at a node (minimum) along the line. The SWR is usually thought of in terms of the maximum and minimum AC voltages along the transmission line, thus called the voltage standing wave ratio or VSWR (sometimes pronounced "vizwar"). For example, the VSWR value 1.2:1 means that an AC voltage, due to standing waves along the transmission line, will have a peak value 1.2 times that of the minimum AC voltage along that line, if the line is at least one half wavelength long. The SWR can be also defined as the ratio of the maximum amplitude to minimum amplitude of the transmission line's currents, electric field strength, or the magnetic field strength. Neglecting transmission line loss, these ratios are identical. The power standing wave ratio (PSWR) is defined as the square of the VSWR, however, this deprecated term has no direct physical relation to power actually involved in transmission. SWR is usually measured using a dedicated instrument called an SWR meter. Since SWR is a measure of the load impedance relative to the characteristic impedance of the transmission line in use (which together determine the reflection coefficient as described ), a given SWR meter can interpret the impedance it sees in terms of SWR only if it has been designed for the same particular characteristic impedance as the line. In practice most transmission lines used in these applications are coaxial cables with an impedance of either 50 or 75 ohms, so most SWR meters correspond to one of these. Checking the SWR is a standard procedure in a radio station. Although the same information could be obtained by measuring the load's impedance with an impedance analyzer (or "impedance bridge"), the SWR meter is simpler and more robust for this purpose. By measuring the magnitude of the impedance mismatch at the transmitter output it reveals problems due to either the antenna or the transmission line. (Wikipedia).
Determining the Speed of a Standing Wave - Demonstration
The relationship between wavelength and frequency is determined. The number of waves, wavelength, and wave speed at each standing wave frequency is determined. The wave speed is measured independent from the standing waves. Want Lecture Notes? https://www.flippingphysics.com/standing-wave-
From playlist Mechanical Waves and Sound - AP Physics 1
Standing / stationary waves for beginners: from fizzics.org
Notes to support this video lesson are here: https://www.fizzics.org/standing-waves/ Standing waves or stationary waves (they mean the same) are formed by the interference of a wave and its reflection. The fundamental and harmonics of standing waves in a system are shown and the importance
From playlist Standing waves, resonance and damping
Physics - Mechanics: Mechanical Waves (15 of 21) Standing Waves 2: Example
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate f=? of a standing wave given m=2g and T=200N.
From playlist PHYSICS MECHANICS 5: WAVES, SOUND
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Standing waves and resonance.
From playlist Physics - Waves
What is a standing wave? How is it different than a traveling wave? And why and how does a standing wave form? Join Mr. H for some clear talk on the physics of standing waves. In 8 minutes of time, you'll understand this topic more than you ever thought you could. You can find more infor
From playlist Vibrations and Waves
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Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to develop the standing wave equation.
From playlist PHYSICS MECHANICS 5: WAVES, SOUND
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From playlist Physics - Waves
The disctinction between standing and traveling waves; a demonstration of how standing waves are formed; and their application to quantum physics.
From playlist Quantum Mechanics
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From playlist Bell Labs Wave Machine
But how exactly do the voltage and current propagate through transmission lines?
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From playlist Transmission Lines
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This video covers Section 17.5 of Cutnell & Johnson Physics 10e, by David Young and Shane Stadler, published by John Wiley and Sons. The lecture is part of the course General Physics - Life Sciences I and II, taught by Dr. Boyd F. Edwards at Utah State University. This video was produced
From playlist Lecture 17B. Linear Superposition and Interference Phenomena
Bell Labs Wave Machine: Standing Waves
Standing waves are created on the Bell Labs apparatus. The apparatus is "open" at both ends, therefore the number of nodes is equal to the number of overtones. For example, the fourth harmonic will have four nodes, the fifth harmonic will have five nodes, etc.
From playlist Bell Labs Wave Machine
Introduction to Pitch Systems in Tonal Music - Basic concepts
UCI Introduction to Pitch Systems in Tonal Music (Fall 2012) Lec 01. Pitch Systems in Tonal Music -- Basic Concepts -- View the complete course: http://ocw.uci.edu/courses/introduction_to_pitch_systems_in_tonal_music.html Instructor: John Crooks, MFA License: Creative Commons BY-NC-SA Ter
From playlist Introduction to Pitch Systems in Tonal Music
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From playlist 8.03 Vibrations and Waves - CosmoLearning.com Physics
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From playlist 8.03 Arabic Subtitles
UCI Physics 3C: Basic Physics III (Fall 2013) Lec 06. Basic Physics III View the complete course: http://ocw.uci.edu/courses/physics_3c_basic_physics_iii.html Instructor: Michael Smy, Ph.D. License: Creative Commons CC-BY-SA Terms of Use: http://ocw.uci.edu/info More courses at http://ocw
From playlist Physics 3C: Basic Physics III
Oxford Mathematics Public Lectures: Hooke Lecture: Michael Berry - Chasing the dragon: tidal bores in the UK and elsewhere. In some of the world’s rivers, an incoming high tide can arrive as a smooth jump decorated by undulations, or as a breaking wave. The river reverses direction and fl
From playlist Oxford Mathematics Public Lectures
UCI Physics 3C: Basic Physics III (Fall 2013) Lec 27. Basic Physics III View the complete course: http://ocw.uci.edu/courses/physics_3c_basic_physics_iii.html Instructor: Michael Smy, Ph.D. License: Creative Commons CC-BY-SA Terms of Use: http://ocw.uci.edu/info More courses at http://ocw
From playlist Physics 3C: Basic Physics III
UCI Physics 3C: Basic Physics III (Fall 2013) Lec 05. Basic Physics III View the complete course: http://ocw.uci.edu/courses/physics_3c_basic_physics_iii.html Instructor: Michael Smy, Ph.D. License: Creative Commons CC-BY-SA Terms of Use: http://ocw.uci.edu/info More courses at http://ocw
From playlist Physics 3C: Basic Physics III
Waves 2_21 Standing Waves and Resonances
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From playlist Physics - Waves