In telecommunication, the term front-to-back ratio (also known as front-to-rear ratio) can mean: 1. * The ratio of power gain between the front and rear of a directional antenna. 2. * Ratio of signal strength transmitted in a forward direction to that transmitted in a backward direction. For receiving antennas, the ratio of received-signal strength when the antenna is rotated 180°. The ratio compares the antenna gain in a specified direction, i.e., azimuth, usually that of maximum gain, to the gain in a direction 180° from the specified azimuth. A front-to-back ratio is usually expressed in dB. In point-to-point microwave antennas, a "high performance" antenna usually has a higher front to back ratio than other antennas. For example, an unshrouded 38 GHz microwave dish may have a front to back ratio of 64 dB, while the same size reflector equipped with a shroud would have a front to back ratio of 70 dB. Other factors affecting the front to back ratio of a parabolic microwave antenna include the material of the dish and the precision with which the reflector itself was formed. In other electrical engineering the front to back ratio is a ratio of parameters used to characterize rectifiers or other devices, in which electric current, signal strength, resistance, or other parameters, in one direction is compared with that in the opposite direction. (Wikipedia).
This video defines a ratio and provides several examples on how to write a ratio and shows how to simplify a ratio. http://mathispower4u.wordpress.com/
From playlist Ratios and Rates
Similar Triangles Using Side-Side-Side and Side-Angle-Side
This video explains how to determine if two triangles are similar using SSS and SAS. Complete Video List: http://www.mathispower4u.yolasite.com
From playlist Similarity
Ratios Introduction - what are ratios?
Ratios are used to compare different quantities. In this introduction to ratios we will look at what ratios are, how we deal with ratios of different measurement units and that ratios can be simplified. To donate to the tecmath channel:https://paypal.me/tecmath To support tecmath on Pa
From playlist Ratios
This video introduces the Golden ratio and provides several examples of where the Golden ratio appears. http:mathispower4u.com
From playlist Mathematics General Interest
Three ways to solve a proportion
This is a short video tutorial on three ways to solve a proportion. For interactive applets, worksheets, and more videos go to http://www.mathvillage.info
From playlist All about ratios and proportions
Learn how to take equivalent ratios and rewrite them into a ratio table. Then solve a proportion question with the table. http://www.MathVillage.info
From playlist All about ratios and proportions
This is a short video tutorial on the basics of ratios. For interactive applets, worksheets, and more videos go to http://www.mathvillage.info
From playlist All about ratios and proportions
Thinking about the meaning of a ratio
From playlist Middle School - Worked Examples
surface area to volume ratio of prisms (KristaKingMath)
► My Geometry course: https://www.kristakingmath.com/geometry-course In this video we'll learn how to find the ratio between the surface area of a rectangular prism and the volume of a rectangular prism, including a cube and a right rectangular prism. ● ● ● GET EXTRA HELP ● ● ● If you c
From playlist Geometry
Building Wolfram Cloud APIs to JS Frontends and Serverless Backends (Part 3)
Mitch Stonehocker discusses making dynamic image APIs with WC for JS front-ends.
From playlist Building Cloud APIs with Mitchell Stonehocker
Physics: Viewer's Request: Mechanics #14: Gear Ratio of a Bicycle
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will solve: How far will the cyclist travel=? If” The pedal rotates 60 times, the wheel diameter is 70cm, the front sprocket has 4
From playlist VIEWER REQUEST VIDEOS: PHYSICS MECHANICS
Arithmetic and Geometric Sequences | Explanation + Examples | Precalculus
This video is an introduction to sequences, where I focus on arithmetic and geometric sequences. Timestamps: What is a sequence? 00:34 Explicit vs recursive definitions: 3:10 What is an arithmetic sequence? 5:09 General formulas for arithmetic sequences: 7:39 Arithmetic sequence example
From playlist Precalculus
Physical Modeling Tutorial, Part 4: Powertrain Modeling
Learn about powertrain modeling and how to actuate vehicle models with power sources, build driveline mechanisms, create multispeed transmissions, and model engines. - Enter the MATLAB and Simulink Racing Lounge: http://bit.ly/2HhcXnU - Download Example Files: Physical Modeling for Formu
From playlist Physical Modeling Tutorials
Science from a Sheet of Paper - Tadashi Tokieda
By curling, folding, crumpling, sometimes tearing paper, Tadashi Tokieda will explore a variety of unexpected phenomena - from geometry and the traditional art of origami, to magic tricks and engineering of materials.
From playlist Mathematics Research Center
Mod-14 Lec-34 Engine component matching and Sizing
Jet Aircraft Propulsion by Prof. Bhaskar Roy and Prof. A. M. Pradeep, Department of Aerospace Engineering, IIT Bombay. For more details on NPTEL visit http://nptel.iitm.ac.in
From playlist IIT Bombay: Aerospace - Jet Aircraft Propulsion (CosmoLearning Aerospace Engineering)
Year 13/A2 Pure Chapter 3.3 (Sequences and Series)
After investigating arithmetic sequences and series in the first two lessons we now take a look at the idea of a geometric sequence, where the next term is generated by multiplying the previous one by a constant value. #sequences #series #sequencesandseries #9MA0 This lesson is meant as p
From playlist Year 13/A2 Pure Mathematics
Making a Mirror with a Variable Surface Shape
Some concepts in this video have been pictured in a somewhat simplified manner to make it more accessible to a less specialized audience. Contents: 00:00 General intro 00:56 Conic constant explained 10:00 Explanation of the manufacturing process 12:25 Testing the mirror 15:32 interferom
From playlist optics
EEVblog #605 - Fig.8 & Cardioid Microphone Patterns
Doug Ford, former head designer from Rode Microphones continues with Part 2 of the microphone technology series by explaining the construction of noise cancelling Figure 8, cardioid, and hyper cardioid microphones. Also, how the polar patterns and responses relate to the physical construct
From playlist Microphone Technology & Design
CCSS What is the difference between Acute, Obtuse, Right and Straight Angles
👉 Learn how to define angle relationships. Knowledge of the relationships between angles can help in determining the value of a given angle. The various angle relationships include: vertical angles, adjacent angles, complementary angles, supplementary angles, linear pairs, etc. Vertical a
From playlist Angle Relationships