Transmission Definition and 708 Threads

Homework Statement An ideal transmission line is terminated with a load impedance of 90 ohms and has a characteristic impedance of 50 ohms. Why does it's S11 response trace out a circle on the smith chart? Homework Equations Z_{\text{in}}=Z_0\frac{Z_0+j Z_L \tan(\beta l)}{Z_L+j Z_0 \tan(\beta...

Hello! I need to understand one seemingly simple thing in wave mechanics, so any help is much appreciated! When a pulse travels to the right toward an open end(like a massless ring that is free to oscillate only in the vertical direction), then when the wave reaches the end it gets reflected and...

Hi, I am new in this forum and still can find my way around easily. Please forgive me if I have posted this in a wrong section. I need help from seniors in the field of wireless transmission. I have done a bit of research but not enough to justify any conclusion. I have a project to setup a LRS...

Hi there, I started working on an idea for an expandable gear CVT about 3 years ago, while out of work for a few months. I had some exciting progress on an idea that I think might be worth pursuing more, but I now have 2 kids, 2 jobs, and no time. I have brought up the project idea with a few...

Homework Statement An incident wave frequency f =500Hz , power Wi = 50 W and amplitude Ai= 5 mm spreads to the positive x in a linear density rope u1 unknown. When the wave encounters another rope ( attached to the first at a point P) density linear u2= 64 g/m (such as u2>u1 ) , The...

Homework Statement find TM p-parallel for (angle of incidence)=68 degrees, n(sub1) = 1.0, n(sub2) = 1.6[/B]Homework Equations how to find angle of transmission, theta(sub)i[/B]The Attempt at a Solution I know that when the angle of incidence is greater than the critical angle, all the light...

Homework Statement Calculate the power (Pso) absorbed from the supply by the transmission line on open circuit. Given parameters are: A1= 0.8698 A2= 0.03542 B1= 47.94Ω B2= 180.8Ω C1= 0S C2= 0.001349S D1= 0.8698 D2= 0.03542 I have calculated Vs and Is earlier in the question Vs= 77325 +...

Homework Statement A transmission line has the primary coefficients R= 2 ohm/m, L=8 nH/m, G= 0.5 mS/m and C= 0.23 pF/m. Determine the lines secondary coefficients Zo, α and β at a frequency of 1 GHz. Homework Equations ω= 2 π f See uploaded formulas document The Attempt at a Solution I'm not...

If I imagine an interplanetary fight between two early races (the universe is about 8 billion years old) and one of them invents a super weapon to extinct the other. The weapon is a grey goo weapon, a swarm of billions of machines, each with the ability to bend light around it to cloak itself...

Dear friends 1.What is wind span ,wight span and normal span, and what is the difference. 2. Factory acceptance test. FAT. For towers what is that meaning and what is necessary test to be require to do or check. Thanks

Hi , I'm studying transmission lines and how waves move through the device , so far I haven't delved into the maths behind it as I have been trying to get an overview of it.So far I have seen the effects when there is an open circuit , shorted and matched impedance loads. The example I saw...

I need to trace a simple radio transmission for school. It's a signal that is broadcasting some talk radio. If I could locate the signal within a couple hundred feet I get an A. Extra credit is for jamming, re-directing or scrambling the signal. Any ideas for any of the said process. It's...

Hello dears i want to know which is best for 132kv transmission line. advantages and disadvantages as in prectical use. but also consider economical factor wisely . what you chose if you are in my place... ACSR Conventional AAAC ( All Aluminium Alloy Conductors ) ACCC Aluminum Conductor...

Hello everyone. The physics forum is a great online community, and I used to spend a lot of time browsing the philosophy pages. But now I've had to register and post, because I've got a very specific problem with regards mechanical engineering. My problem is relating to torque transmission...

hi friends. I am new for transmission 132kv project. For transfer 100MW power about 95km line. 1. I want to know what is short ckt current and how to calculate it. 2. load breaking current Your kind help required thanks.

Hi all, Hopefully this is the right subforum. I have a question related to Arduino sensors. Q:Generally, when do you need to be worried about losing data from having long wires from your sensor to your Arduino board? Details:For example, I've been looking at two sensors. Sensor 1: MLX90614...

Hello I'm now studying transmission line theory. I got to know how impedance matching between characteristic impedance of transmission line and electrical load is important to achieve maximum power transfer and minimize power reflection which causes danger for the system. But the textbook...

To calculate Transmission and Reflection amplitudes (t and r), say in the figure below which is composed of three regions, first we have the solution of Schrodinger equation in each region as: \psi _i=A_i |i> +B_i |-i> ; i=I,II,III. It seems that by matching the three wave functions and their...

1. Homework Statement After a certain amount of running, there is likely to be changes in the values of the engineering parameters of the system in section (a). One of these is the friction coefficient, Carry out the activity with calculations to find out the effect on power transmission if...

Homework Statement I would like to define pressure loses through transmission line to the transducer. In transmission line I have a reducing union, filter and L pipe. How I can find this differences? In case of frequency my reducing union reduce pipe diameter 6 mm to 3 mm how i can determine...

Homework Statement Is there any difference if I measure static pressure value from the down side of the pipe or up side of the pipe? I am getting an error just small as 300 pascal when I do zero measurement. Here I draw the system also. The diameter of pipe is 10 cm. What could be the possible...

China is embarking on developing high speed railways that use wireless transmission of power, thus reducing the need to replace the sliding electrode which needs frequent replacement. The project is aware of the health & safety issue, of course. It also implies that they have already come to the...

Hey guys, I am a bit confused while calculating top speed of the car using gear ratio, Torque, Power and Engine Speed(RPM). Can someone help me out with this? Specifications are given as follows: Maximum Torque : 19.2 N-m @ 3800 RPM Maximum Power : 10 Hp @ 2800 RPM Tire Specifications: 25x8...

This may appear like a homework question, but I am not asking for answers for the question, so please don't remove this post! This is a conceptual question, and I just want to show how I came to that question. The following question, " An electron and a proton of identical energy E encounter...

When wave is reflected back means power is reflected back and not all power is consumed at the load. But I am thinking if I placed the load at the position of Vmax (of the stationary wave formed by the incident and reflected wave). Isn't that all the power will be dissipated at the load, so...

I have a question about complex reflection and transmission coefficients. For example, I am modeling a wave in air (medium 1) ## \varepsilon = \varepsilon_0 ## reflecting on, and transmitted to, a medium 2 with ## \varepsilon = \varepsilon' -j \varepsilon'' ## If the wave would have traveled...

Homework Statement If 39.4 kW of power is to be transmitted from a generating station over two 0.141-Ω lines, estimate how much power is saved if the voltage is stepped up from 120 V(rms) to 1200 V(rms) and then down again, rather than simply transmitting at 120 V. Assume the transformers are...

Ok I do not know if I am right about this but : if you have an AC 120 V 60Hz generator connected to a wire of Length L(1000KM) and Resistance R going to a motor down a well, to know if you will have Voltage loss you do λ = C / F C is the speed of Light = 299 792 458 m/s F is the 60Hz λ =...

Consider this, A couple, where the male is HIV+ve and the female is perfectly alright, not infected. Can they have a baby without getting neither the mother nor the baby infected? Naturally, probably not because, the female will get infected, so by AI(artificial insemination) there is no sexual...

Hello, As I understand it there is an equal and opposite reaction for every mechanical action. In the case of a vehicle drivetrain the engine generates a torque at the flywheel or flex plate which becomes an input to the transmission and ultimately the wheels. The rollong resistance of the...

Hi, The reflection coefficient (R) of an EM wave is, as far as I know, 1 if there is total reflection and -1 if there is total reflection AND the phase changes by 180º. However, we also know that the transmission coefficient is given by T = R + 1 (or by its own formula, which should give the...

I have calculated the electron transmission function T(E) over a potential step of height V0 using T-matrices. I model a semiconductor heterojunction, which requires different effective electron masses on either side of the step. The wave functions on either side of the step are planar waves...

I have calculated the electron transmission function T(E) over a potential step using T-matrices. I model a semiconductor heterojunction, which requires different effective electron masses on either side of the step. We have 2 boundary conditions at the step at x = x0: Y1(x0) = Y2(x0)...

For some reason I can't find any satisfying answers to my questions on the internet. 1. Are mostly all remotes, phones, wifi, etc. using wireless digital transmission? If so, why does a wifi signal get weaker when you move further away? The inverse square law shouldn't apply to a digital signal...

Hello, So I have a circuit where I input a square pulse with a source impedance and load impedance (which are just pure resistors) each of which can be varied and a transmission line circuit connecting them which is made up of resistors, capacitors, inductors in a lumped element model. I set...

I was reading textbook and felt confused about this-- when trying to deal with inner inductance of transmission line, only the fraction (x/r)^2 of total current, which interlock with magnetic lines should be considered. However, isn't the inductance or even flux linkage an intermediate...

Hello, I have a few questions for calculating heat tranmission between materials ( i need some formulas and tips). First of all i need to find out how much energy a water pipe transmit to the concrete where it is in. I couldn't find a formula for this one. Then the concrete should store some...

I'm a little confused regarding the maths of TE and TM modes. Solving the following system for TE (which derives from Ey(x, z, t) = Em(x) = exp[i(ωt-βz)] ): Asin(px) + Bcos(px) , -d/2 < x <d/2 Cexp(-qx), x>d/2 Dexp(qx), x<-d/2 we conclude in two types of solutions for TE modes: symmetric...

Homework Statement I am currently embarking on a project where I have to build a communications system which can take in an analog voice signal, translate it into digital signal, and send it across to the receiver where the original voice gets recovered and it can be played back using a...

OK, struggling a little here to grasp this one. Any help guiding me in the correct direction would be welcome. 150mm diameter pulley is directly driven at 250 rev per min. A V-belt is used to transmit power from this electrically driven pulley to another, which is 400mm in diameter. The centre...

Many modern electric train locomotives have the option of regenerative braking. Most of these locos have HVAC power transmission. I'm wondering, when they brake in regenerative mode do they actually generate DC (I'm not sure whether modern electric locos prefer DC motors or AC motors or is the...

Homework Statement A power station supplies a factory with 1MW of electrical power at a p.d of 10KV. The total resistance of both cables between power station and factory is 0.5 ohm. Find the percentage of the power station output power which is delivered to the output factory.How does this...

We all know that current can be induced in a coil other than the coil carrying current by electromagnetic induction. This type of wireless current transmission is possible only in a limited or short distance. My question is that can we transmit current over long distances.this could have many uses

Homework Statement (a) A transmission line has a length, ℓ, of 0.4λ. Determine the phase change, βℓ, that occurs down the line. (b) A 50Ω lossless transmission line of length 0.4λ is terminated in a load of (40 + j30) Ω. Determine, using the equation given below, the input impedance to the...

Hi just started working on a hobby project with making a wind mill. I got to the part were i have made the blades and the casing, for the wind mill. I was wondering what type of generator should i use for a 1,5m diameter blade. I really don't have anything special that i want the power to go to...

If I modulated a laser frequency with voice, would a photo cell be capable of receiving that information?

hello! as for wireless transmission of energy, what is the efficiency and how far the item can be? where can I read more about it? thanks!

Homework Statement Consider an uni-dimensional scattering by a delta function at the origin, given by the potential ##V(x) = g \delta(x)##, with ##g>0##. Using the following result, with ##G(x)## being the green function: $$\Psi (x) = e^{ikx} + g...

I have several questions about poles and towers. a. Does all of transmission towers carries three-phase powers? Is there no transmission towers designated for single-phase? b. Does all towers are for transmission purposes only? Is there any towers in the world used for distribution instead of...

Can you use a speaker to influence a FM analogue radio transmission no matter how small? The speaker and antenna where about 2 m apart. The PC has an audio AMP added in of 20 W. see Drawing not to scale.