Transmission Definition and 708 Threads

Homework Statement A source with 50 ohm source impedance drives a 50 ohm T-line that is 1/8 of a wavelength long, terminated in a load Z=50-j25 ohms. calculate TL, VSWR, and the input impedance seen by the source

I know you can name transitions between states like Lyman alpha, beta, gamma and whatnot but every time I see them they are written with a capital letter instead like K-alpha, beta, gamma. I cannot actually find a table anywhere (yes I have googled) that sums up how the two naming...

Hi All, we are planning to build a wireless audio transmitter. In 2.4GHz Band. I would acknowledge that this is my first audio interfacing project. So i have a lot of doubts about the way i can interface audio and stream the data out. we plan to use an audio codec which can take Mic ( line...

Hello, I've been doing a bit of reading into Nicotine, but I am somewhat stuck. Any help would be much appreciated. Nicotine binds with Cholinergic binding sites, or acetylcholine binding sites. My question is how do they differ? Why is Nicotine addictive, if without it you have Acetylcholine...

Can anyone explain what "Electron Transmission Spectroscopy" is? Or give a link where I can get an explanation?

Hi all, I have brave hopes of modeling the following problem: Imagine an antenna transmitting an ~50V 100kHz sine wave. Imagine a receiving antenna placed three or four feet apart, with an amplification and detection circuit. First, measure the amplitude of the received wave. Next...

Z in =50-j10 Ohms i in=2 amps length = 2 meters Z0=75 Ohms u=2E8 meters per second beta=.3 rad/m How do I find I+ and I- at the input? What is the voltage at the load? Any help would be appreciated.

Wireless Power transmission(URGENT) Hi guys Im actually plannin to build a wireless transmission system using induction, and without using a soft iron core. We are actually having 2 coils, one primary and one secondary. Our problem is that we aren't getting any kind of induction output. The...

Power station generates 120kW Electricity can be transmitted either at 240V or at 24000V using a step-up transformer. The cables have total resistance of 0.4W What is the power loss when voltage is transmitted at: 1) 240V 2) 24000V I AM SURE YOU CAN WORK THIS OUT USING I...

How is signal transmission speed determined in a transmission line? For example, what determines how long it takes a single pulse to go from one end of a line to the other end. I would assume it depends directly on the conductivity of the material from which the line is made but I'm not sure...

In India why the transmission level voltages are in multiiples of 11 ? Ex: 440 V, 1.1kV, 6.6kV, 11kV, 33kV, 66kV, 110kV, 220kV, 440kV

If waves collapse upon detection, how is it that the Friis transmission equation yields accurate results? Regards, Bill

I know that smooth and cardiac muscle cells (myofibers) are connected to each other by gap junctions. How are skeletal muscle cells connected to each other (to transmit the AP)? Thanks, any responses appreciated

I have a question because of something I remembered while I was looking at some large copper windings for a generator. I heard one of my teachers say that electricity moved along the surface of a copper wire. I am wondering how pitting a copper wire, making it sponge like, or carving...

First of all I'd like to say hello. Secondly, my Physics is not very exceptional, so please don't mock me if I ask sth very dumb. :) Homework Statement A power station giving an output power of 100kW at 20000V is connected by cables to a factory. If the resistance of the cables is 5.0 Ω...

Hello everyone. I have some zirconium that is coated with 1nm of Ni. Now, here's the problem: I don't know if the coating is actually 1nm and have to find out. I don't have access to our AFM today, so I can't use that. But I do have light transmission data from the sample. i.e. I know...

...no, not the cool one, the one found at the end of transmission lines (sorry). Well here's my question; I believe you need to terminate transmission lines with the same impedence as the characteristic impedence of the line itself in order to prevent reflections from the end and 'ringing'...

So here is the situation: At a particular site a crew of electrical workers were putting some transmission cable in the ground. The cable was off loaded from behind a trencher machine (the cable is in a roll of around 2000 feet). Some short time less than 4 hours another crew came to put some...

Hi All, As a process of my project work, i have been asked to develop a manual transmission. I have to design gears (Crown, Planetary and Sun gears) to achieve a final reduction of 30.45, with first stage gear reduction & second stage reduction being 5.28 & 5.77 respectively. Can...

Hi, first time poster here. I am a mechanical engineer, and I am looking for information on using fiber optics to transport solar energy. There is a new field called daylighting, that uses solar energy for lighting during daylight hours. It uses a variety of gadgets to do this, and some...

Hello everyone , I am still new to the protection field so i would appreciate if you can help me with analysis of the following, A 13.8 Kv OHTL was cut and fell on ground , the cable was still live although being protected by Earth fault relays and Over current relays(Instantaneous and...

What is the relationship (generally speaking) between film strength, film thickness, and viscosity: If I polish / superfinish the gear teeth, and bearings on trans, can I go with a lighter viscosity oil, to improve the efficiency of a manual transmission, while still keeping reasonable safety...

Hey guys, professor at college just completed teaching amplitude modulation and other stuff.Well while explaining need for modulation he said that height of transmitting antenna should be a multiple of "one fourth the wavelength" and so it is required to modulate the signal to higher carrier...

I have a 2005 Mazda 6, AT, 4 speed... I was wondering how much harm does it do to the transmission if you were to put the car into neutral just as you go down a hill then put it back into drive once the hill levels out? Of course this saves gas and allows you to increas speed. I used to drive an...

I was wondering if anyone on here could give me a detailed explanation on how light passes through glass. I'm a junior in physics at a university, so it's OK if the explanation is complex.

Suppose some astronauts have landed on Jupiter. (a) When Jupiter and Earth are on the same side of the Sun and as close as they can be to one another, how long does it take for radio transmissions to travel one way between the two planets? Suppose the astronauts ask a question of...

Okay I have a question for you engineer types. I teach a little high school physics and something has struck me as slightly odd in what they get taught. They learn about transformers and are told that a major application of them is in electrical power transmission. They are told that since the...

i am doing a project on witricity (wireless transmission of power) using magnetic resonant coupling. can i do a frequency sweep to attain the resonant frequency? can i use resonant transformer to achieve magnetic resonance. if not, what is the alternative? i would value your suggestions...

Hello All, I have two PCBs, board A and board B. Board A has a 50MHz Crystal that I am making available through a high speed digital isolator (IL711-2E) to a chip that is on board B. Here's the datasheet on the isolator IC http://www.nve.com/Downloads/il711-2.pdf". Now, I was thinking about...

Work out, with full details, the transmission coefficient for the finite square barrier given by: T = 1/{1+[(V_o ^2)/4E(V_o - E)]sinh^2 (k_2 a)} where T is the transimission probability

Is it true that lossless transmission lines don't distort signals? to me, they seem like low pass filters. i had this class a while ago, but I guess i forgot this, or never understood it thanks

Hello! 1 MW can be transmitted , for example, in 2 ways: 1MW=100V*10000A; or 1MW=10000V*100A. In the second case less energy is lost because P=RI^2. But my question is: what is different at a particle level to deeply understand what is going on? Thanks

note: I really hope I'm not rehashing a thread that already happened or posting this in the wrong forum... I did some searching, and couldn't really find anything related, but if this is in the wrong place or old news, feel free to yell at me. semi-irrelevant background: I'm currently...

Why is it that we are able to use a laser beam with optical fiber but not with a white light source?

I have a simple question - but I somehow doubt there is a simple answer. 1) I would like to start a small, non-commercial, home transmitted FM Radio Station - mostly for fun and as a hobby. I have seen an 18W transmitter for a reasonable price. I live on relatively flat land in the country...

I'm trying to bridge the gap between several expressions describing the insertion of a constant perturbation: a_{f}(t) = \frac{1}{i\hbar} V_{fi} \int^{t}_{0} e^{i(E_{f}-E_{i})t'/\hbar}dt' = \frac{1}{i\hbar}V_{fi}\frac{e^{i(E_{f}-E_{i})t/\hbar} - 1}{i(E_{f}-E_{i})/\hbar} so...

I am surprised that this term was not found in this or the biology forums when I searched for it. I'd never heard of it until my sister, a pediatrician mentioned it in conjuction with a discussion about MRSA and infectious diseases in genera. http://en.wikipedia.org/wiki/Fomite The term...

Homework Statement Two copper wires, one 1.0 mm in diameter and 1.0 m long, the other 2.0 mm in diameter and 2.0 m long, are joined together end-to-end and hung vertically. In order to tension this compound wire, a block is suspended from it. It is found that a transverse pulse takes 50...

Homework Statement A pair of power transmission lines each have a 0.850 Ω resistance and carry 779 A over 9.85 km. If the rms input voltage is 39.5 kV, calculate the voltage at the other end. Homework Equations The Attempt at a Solution

I was wondering if anyone could give me more information about wireless power transmission, in particular, technical information about the physics and current prototypes made. I've looked on the internet, but as yet I haven't had much luck.

Transmission of Light...How? Hi there all, I'm not sure whether this is in the quantum mechanics area but here goes... I was just wondering how light is actually transmitted through a substance like glass. I'm assuming there aren't "holes" that the photons/waves pass through, so I'm...

Why microwave frequencies are more affected due to rain? How does water actually affect microwaves?And lower frequencies have more diffraction.Why is it so?

i know on my bike i can't change gears if I'm not spinning the wheels and i know in a manual transmission you can't change gears really unless you're moving. anyone know of a transmission system that can change gears while stationary?

I seem to understand transformers very well, but one aspect of stepping up voltage for transmission is confusing me. I'm sure it is a very small oversight on my part. In an ordinary electric circuit, when the voltage is increased, keeping the load resistance the same, the amount of current...

Hi, My Quantum textbook loves to skip the algebra in its derivations. It claims that the solution for 'T', the transmission coefficient of the wave function (E>0, ie. unbound) is T = \frac{2qke^{-2ika}}{2qkcos(2qa)-i(k^{2}+q^{2})sin(2qa)} Its prior step is to offer two equations (which match...

Why does the double-slit experiment with a laser work properly in an atmosphere? Likewise, I've seen news reports of entangled photons transmitted in a fiber or in open-air used to generate a shared secret. So, both superposition and entanglement works. But, the fact that the speed of the...

Hi, I have a small fixed size packet of information that I want to transmit and detect errors with a high degree of confidence (no correction is required). I'm guessing that a CRC is probably the way to go but don't know how to work out what form of CRC to use. I want to be able to specify a...

Hi guys. Let's say we put a satellite on a geosynchronous orbit over the earth. The signal transmitted by the satellite does not reach the exact half of the Earth as much as you can intuitively try but is a portion formed by the two tangents from the point the satellite is on. The problem is to...

Just one question, I understand that for an antenna to transmit an EM signal, a time varying Electric or magnetic field needs to be applied to it, why is that so? I mean what's the physics behind it? why can't a constant non varying electric field be used for the purpose? Can you help me out? I...

Let's imagine the year 2107.In that time electrical power will be generated in nuclear power plants and electrical energy will be produced in big nuclear reactors. Also the electrical energy will be transmitted by superconductor cables. The electrical riddle no.5 is subjected to one of...