Transmission Definition and 708 Threads

Homework Statement Picture of Problem: Homework Equations $$\psi(x) = A_n e^{ikx} + B_n e^{-ikx}$$ for n=1,2,3 The Attempt at a Solution I know i need to relate the wave functions $$A_n e^{ikx} + B_n e^{-ikx}$$ for n=1,2,3 (the three areas of the barrier - before barrier, inside barrier...

Homework Statement Figure shows a 50 Hz, high-voltage, transmission line. The relationships between the sending and receiving end voltages and currents are given by the complex ABCD equations: where 'S' stands for sending-end and 'R' stands for receiving-end (a) Given the parameter...

I'm working an electricity broking desk at a finance firm this summer, and was hoping someone could clarify the science of it all for me. -For example, a plant has 350MW of capacity. Say 350MWh are demanded for a one hour period. Assuming this plant bids successfully to supply the full amount...

Hi pf, please could someone help explain some concepts relating to bandwidth and radio transmission. As I understand it, radio transmission involves modulating a carrier wave with the signal you wish to send. The bandwidth is the range of frequencies that are contained within the signal. I have...

Hi, I was wondering if it would be possible for someone to help me clarify a few things regarding transmission lines and transformers? For a Power Transmission line, what exactly is the mutual coupling between phases of a 3 phase line? Is this the same as the shunt capacitance and if not...

Hi, if I simulate a three phase transmission line operating with a fault across two of the phases, would the mutual coupling have any effect on the current through each of the lines, as I have calculated the fault current values using symmetrical component analysis and the values are...

We have just started to look at transmission lines/coaxial cables in one of my classes. This uses the concept of having 2 wires close together causing an impedance/capacitance that allows/controls propagation. However I have never really considered how electricity propagates in the first place...

Hey guys - I've been using this website to study transmission lines. (great study aid - posting for others to use. Great for smith charts) However, I've noticed this graph they have for load matching: I'm having trouble finding or understanding a relationship for reflection vs frequency...

I need to figure out if my companies pulling equipment can handle a 795 drake conductor (about 1 lb/ft) double bundled (times 2). The pulling equipment has a safe working load of 4000 lbs. We are pulling it across 16 spans with a average span of 674 feet. the towers are 115' tall. Max sag...

I understand that reflection of EM waves is the electrons on the surface of an object being caused to oscillate, and transmission is the electrons all the way through the object being caused to oscillate. Why, in reflection, when the electrons on the surface of an object are caused to...

I was wondering why light transmission through a solution decreases exponentially and not linear with the concentration of the absorbing compound in solution. I know the Beer-Lambert law, but I do not really understand the reason for this logarithmic rather than linear dependence. Can anyone...

Homework Statement A small town requires 1.00MW of electricity. The town is located 35 km away from power source. Electricity delivered at 120 Volts. (1) What current is required by the town? (2) Assume answer to part (1) is the current flowing along the transmission lines. Waste heat...

I've been asked to complete a project that requires secure FTP transmission of confidential legal agreements. Despite a healthy background/experience in data communications in the banking industry, time has passed and I've never used PGP or RSA before. NOTE: Everything will be done under...

Is it possible to have a material that transmits infrared in one direction but not in the other? There are a few articles available that say it is, though I don't have any here with me now. So, let's say you make a hollow sphere of this material, oriented so that infrared light can pass out of...

In some quantum textbooks [1], the tunneling transmission formula depends only on the density of states of 2 regions (DOS) involved in tunneling. (T(E)=C×DOS1(E)×DOS2(E), where C is constant). However, in Landauer transmission formula (without tunneling) the transmission depends on both DOS and...

Hey guys, So this is entirely theoretical and I am just curious if its possible and how it could be done. But how can you go about changing the bandwidth of a particular signal? So a lot of times we have a signal at a given frequency, and there might be a little bit of aliasing into other...

A lot of electronic hobbyists would want to transmit information, signals through a medium other than the usual rope called wire or cables As this is a bit old fashion to have wires as a means of sending switches. So here let's share ideas on how to produce Electromagnetic wave... The only...

i have decided to do wireless power transmission for my university mini project competetion. So can anyone clear me how to proceed with it. If possible recommend me a better topic. many thanks in advance...

Hi guys, I was playing around with conductor configurations and observed this phenomenon. Mind you these are for the High voltage transmission (138 kV) lines that span kms. So apparently, the orientation of the conductor relative to North will change the ampacity of the transmission line. Can...

Homework Statement Figure shows a 50 Hz, high-voltage, transmission line. The relationships between the sending and receiving end voltages and currents are given by the complex ABCD equations: V_S = V_R (A_1+jA_2)+I_R (B_1+jB_2) I_S = V_R(C_1+jC_2)+I_R(D_1+jD_2) where 'S' stands...

Howdy all! In some project I do,I need to design belt transmission,now the tricky part is: On the output of the belt,I have wheel that needs to turn at 700 rpm,and I need to deliver power of 6KW. Now the weird question:I need to design the belt transmission so I will have 20 percent power loss...

Hi all I'm an electrical engineering student currently looking for a thesis topic. I did a project previously in wireless power transmission based on inductive resonance coupling with different designs for the transmitter and receiver. I'm very interested in this topic, mainly wireless power...

Hello all, I had a question out of curiosity. Say you have a green piece of paper. This paper is green because it absorbs the wavelength of lights corresponding to the other colors of the visible spectrum and reflects (transmits) green light, thus appearing green. If one were to shine a laser...

Homework Statement An infinite string is made of three sections, a single intermediate section of length a and density p1 between two semi-infinite sections of density p2. A wave of frequency f is incident on the intermediate section. If a is an integer multiple of the wavelength in that...

Hello to experts! What is impedance inversion in quarter wave transformer? I need definition not a concept, not explanation, not description. But a precise and point definition. Thank you very much.

Hello experts! What is stubs in regards with transmission lines? I don't find any precise and point to point definition of it. Every where book tries to make us understand with a concept of 4 to 5 lines and this makes me confused. Please tell me the very precise and easiest definition of...

Homework Statement A lossless transmission line with characteristic impedance Z0 = 50Ω , β = 5∏x10-3, and length l =80 meters, is terminated into a load ZL = 80Ω. The transmission line is powered by a source with 120 V and ZG = 12 Ω. Calculate the load voltage. Homework...

Hello. I need to derive this equation (attached), can you help me please? That's the equation for a two-pair terminal medium-distance power transmission line (20~100km). I have no idea how to start it. Can someone guide me, please?

I have recently found an intresst in thinking about and want to try to develop a CNC system or something similar with computer to mechnical hardware communication. but i believe my knowledge about mechanical engineering feels limited and would appreciate some good general books about...

Homework Statement As seen in picture: A coaxial transmission line has a characteristic impedance of 50 Ω, propagation velocity of 200m/μs, length of 400m, and is terminated by a load resistance, RR = 16.7 Ω. At the sending end the line is connected to a pulse generator that has an...

Homework Statement Incase formatting of numerical answers below is weird, please see attached picture of question. "Consider a distortionless transmission line with impedance 50 Ω, capacitance 0.1 nF/m and attenuation 0.01 dB/m. Find: (a) the resistance, inductance and conductance of...

Homework Statement I have this self study question, can anyone provide some guidance?... A pulley 150 mm diameter is driven directly by an electric motor at 250 revs min–1. A V-belt is used to transmit power from this pulley to a second pulley 400 mm diameter against a load of 200 Nm...

Homework Statement The task is to calculate the transmission probability when E<V0 given that the step potential barrier is of infinite length. Homework Equations So far it seems simple enough. For region I, where x<0, (we're assuming, as usual, that the particles/ waves are coming...

Hi all... I am trying to design digital modem to send 3 things,, audio, data and image, the problem that when I try to send image 640x480 pixel, with JPEJ format, I need to get a value for a transmission time by using the type of modulation scheme and symbol rate, my question is what the...

Greetings, When I think of light being "transmitted" through air, I have always used the idea that the light is not interacting... it is just passing through. However, I had a student ask me, if transmitted light is not interacting with air molecules, then why is the speed of light slower in...

I can show that for a step potential and E < V, that the wave function is fully reflected and has no transmission into the potential interval (interval 2), x =0 at interval boundary, by Wave equation for interval 1: Ψ1 = A1eik1x + B1e-ik1x Wave equation for interval 2: Ψ2 = A2eκ2x...

Homework Statement In optics, the following expression needs to be evaluated in calculating the intensity of light transmitted through a film after multiple reflections at the surfaces of the film: {\sum _{ n=0 }^{ \infty }{ { r }^{ 2n } } cos\quad n\theta })^{ 2 }+{ \sum _{ n=0 }^{ \infty...

In wikipedia, it said for optical fiber, a loss that takes place at discontinuities of refractive index, especially at an air-glass interface such as a fiber endface. At those interfaces, a fraction of the optical signal is reflected back toward the source. But what I learned in tranmission...

I'll start with what I do know: [SIZE="2"]Shannon Law gives the theoretical upper limit C_{noisy}=B*log_{2}(1+\frac{S}{N}) if S = N, then C = B As N→∞, C→0 As N→0, C→∞ Nyquist Formula says approximately how many levels are needed to achieve this limit C_{noiseless}=2*B*log_{2}M (If you do not...

Hey all, Refer to page 5 in the pdf in the link (http://whites.sdsmt.edu/classes/ee481/notes/481Lecture26.pdf) I am having a little bit of a hard time understanding a portion of a derivation. You will notice that when determining the ABCD paramters of the shunt stubs they merely use A=1...

A 50 ohm transmission line is terminated with 60 ohm and 30 ohm resistors in parallel. The voltage at the input to the line is V(t) = 100 cos (5X10 ^ 9 t) and the line is 3/8 th of a wavelength long. What average power is delivered to each load resistor ? My ans is getting 81.6 but actual...

I have been reading up on transmission lines and I was wondering: If a transmission line has high dielectric loss (low conductance, G) does this have any effect on the velocity factor? I would think that it would reduce the velocity factor because some of the energy would be absorbed by...

Homework Statement A 230kV, 160km long transmission line has the following parameters expressed on a 230kV, 100MVA base. R = 0.0151 X = 0.1476 Y = 0.288 The sending end voltage of the line is held constant at 1.0 pu. The load at the receiving end has a lagging power factor of 0.8...

Homework Statement Two conductors are separated by an insulator. Model the insulator as a square barrier of height 0.01 keV and a width of 5nm. Determine the transmission coefficients for electrons of 7,000 meV. The only thing is I have to use the approximation formula for finding the...

I have an example problem in my book. I have uploaded an image. The part I can't figure out is how to do the last part of the problem to come up with the transmission coefficient. The book gives me a formula but when I plug in all the numbers from the formula into my calculator I get a...

Hi, I'm building a Yagi antenna for the 440Mhz ham band. The outline I'm following uses a driven element of a folded dipole; Z = around 288 ohms. I am feeding this with 50 ohm source. Many internet sources describe a balun made from a 1/2 wave length coax (velocity factor adjusted). I will...

[I could not fit the last "e" into the title] Hi! I am writing a report on TEM, and was asked to consider the effect of accelerating voltage on the resolution. Since resolution in the light microscope is limited by the wavelength of visible light, we obtain much higher resolutions in a TEM...

Homework Statement The problem involves a calibration curve which was created and where % T vs concentration was favored for use over the usual Absorbance vs concentration and a question of why would this be used in favor over the latter relationship curve was presented. other details...

https://www.physicsforums.com/attachments/66302Two-conductor transmission line, find the potential difference V of the two conductors.? Two-conductor transmission line. At point P (x=43 cm, y=32 cm) in Fig. 2-10, |E|=450 V/m. If s=25 cm, h=29 cm, and r=12.5 cm, find the potential difference if...

What is the meaning of the CESMM3 Ref in BOQ of Transmission & Distribution? In the Bill of Quantities of Some project of Electrical Transmission and Distribution I came across the CESMM3 Ref when I searched in the net I know that it is the " Civil Engineering Standard Method of...