Questions tagged [transmission]

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1answer
66 views

Wire size and Voltage-Amp relation [closed]

If wire size correlates with Amp, and if Voltage correlates with Amp reversely (?), why do we have electric lines (for transmission) with high voltage, but also wires with big radius? I remember ...
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2answers
2k views

Length of Transmission Line & Characteristic Impedance

Just a simple Question for clarification: Does the physical length of transmission line affect its impedance? We all understand that the height of dielectric (space between line and ground) affects ...
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1answer
100 views

Understanding work case of directional antenna [closed]

I try to understanding the workflow of directional antennas. I want to implement a bluetooth communication with external, directional antenna. Lets suppose that I buy this: https://cdn3.bigcommerce....
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1answer
116 views

Transmit audio via laser: unexplainable Diode

I'm currently trying to build a circuit to transmit audio via laser. It works great and the quality is decent. But I don't get the reason for the diode. If I remove the diode and replace it with a ...
13
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6answers
3k views

Simulate bad cell phone reception in the lab

I'm currently developing an internet of things device that utilizes a uBlox SARA-U260 gsm/3G modem. In field testing, we have had significant software/firmware issues due to poor cell phone reception ...
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2answers
2k views

EIRP and Radiated Field Strength

I have a question regarding Field Strength: I was told it is independent from the frequency, is that true? If so, why? Moreover, I came accross this equation for converting the Field Strength to ...
3
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2answers
704 views

Quarter Wavelength Matching : Missing Reflections?

With regards to the quarter wavelength impedance matcher, I understand it is used to correct a mismatch and looks as follows where \$ Z_T \$ is the matching line: I understand that we have set up the ...
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2answers
5k views

Primary and secondary substation equipment

There are many devices that can be found in the substation. One of the categorizations for substation is between primary and secondary substation equipment. Which device types belong to each ...
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6answers
2k views

Why does more bandwidth guarantee high bit rate?

The definition of bandwidth is frequency range and it seems to be correct to say that higher bandwidth guarantees higher data rate. However, i do not understand why it does. Data rate depends on ...
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2answers
2k views

Determine the resistance of electric transmission lines

How could I determine the resistance of electric transmission lines? I face a lot of problems in determining the resistance of electric transmission lines, for example: "if we need to deliver an ...
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1answer
57 views

Which standard use for custom communication DC

I want to transmit data and power over 10 meters at 12 volts with 1 amp. I don't know if I could do it using UTP, because that's a standard for other things. Which standard should I choose? Number of ...
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4answers
2k views

What is a return line in AC power transmission? Why is it needed?

This diagram shows V vs. t for three-phase power transmission: What is the corresponding I vs. t diagram? Would that diagram help explain what a "return line" is and why it is necessary? (cf. the ...
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3answers
10k views

Why 3 phase and not 1 phase power transmission?

Why does power transmission use three lines with three different phases? Why not three lines all in the same phase? Does it have to do with the alternators used for generating the power, or is there ...
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1answer
363 views

Solving Entries in a Four Port Transmission Matrix

The well-known transmission (ABCD) matrix for a two-port network has entries which can be solved by setting open or short boundary conditions on the opposite terminals. Mathematically, the two-port ...
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3answers
268 views

Visible light communication

I am working on a project which uses visible light communication. The transmit side consists of mosfet irf J40 and bc547 transistors driving a 3W LED. At reciver side I am using a 5mm pin photo diode ...
3
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1answer
49k views

Difference between instantaneous, definite time and inverse time over current protection relays

Protection coordination is very important in transmission and distribution power networks. One of the most widely used and important protection relays are over current protection relays. What is the ...
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1answer
10k views

Analog signal vs. Alternating current

I am seeing that both of the analog signal and alternating current is represented by the same graph: As far as I think I know, an alternating current travels back and forth with gradual changes in ...
-2
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3answers
123 views

What do I need to transfer data from device A to device B? [closed]

Disclaimer: I have no experience or knowledge at this topic. I ask this only from curiosity. I want to build two devices. Device A should send data to device B. Device B should display the received ...
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4answers
467 views

Transmission Line Question

I have a question concerning reflections due to impedance mismatching. Now, assuming a lossless TL, the latter is modelled by sections of lumped L-C segments where L in a series (sub)element of the ...
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1answer
2k views

Why did the world stop using Dc for transmission? [duplicate]

Why did the world stop using it for transmission ? And is there any countries still use it ?
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2answers
100 views

Transmitting data in a house which strongly attenuates RF signals

Is there a way to transmit data throughout my house without RF? My application: I want to spread sensors and actuators in my home. Due to the nature of these things I do not need high data rates, a ...
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1answer
203 views

SNR definition in SIMO system

Consider a SIMO (1 transmitter - several receivers) system in which The receiver antennas are used to obtain space diversity and we have a multipath fading channel between transmitter and each ...
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1answer
709 views

Transmission line, cable impedance

I am currently doing a design where I basically have two different types of (digital) signals. The first signal group is fully differential (P/N pair). The other group are single ended signals ...
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1answer
263 views

Termination resistors usage

My doubt pertains to the usage of termination resistors. This is a continuation of the discussion I saw in this link - Termination resistor. I understand that any transmission line can be simulated ...
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1answer
646 views

Transformer ratio test …deviation close to the limit

When conducted ratio test .33/11 Transformer gave a ratio deviation of 0.48 % for first tap ..it is the commissioning test .the Standard deviation is 0.5 % .for all other taps the deviation is well ...
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1answer
3k views

Wireless power transmission calculations

I have been able to calculate and fix components for the transmitter circuit of wireless power transmission system but I am still having some challenges. They are: 1. How can I calculate theoretically ...
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2answers
529 views

Data rate vs. data volume

I'm a little confused by the two terms. What do data rate and data volume mean and what are the differences?
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2answers
3k views

Coaxial cable vs shielded pair

I need to wire a sensor with analog output to an acquisition system, and the presence of a separate "shield" connection on the DAQ made me thinking: why would I use a shielded 2-wire cable versus a ...
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2answers
1k views

What is the resulting RF power of the forward and reflected power if a Transmitter is operated into an open or short?

If I have a 25 Watt Transmitter that transmits through a switch into an open and/or short, what power would the switch experience assuming loss-less transmissions lines and switch?
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1answer
370 views

Alternative to AM and FM transmitting for data transmission?

So, I need to communicate wirelessly between a micro-controller and my computer. I'm building a radio receiver circuit, and a radio transmitter circuit that works on FM transmission. However, I had an ...
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0answers
29 views

Distributed parameters of an unknown conductor

I have been asked in my assignment to find the values of the four distributed parameters R, L, G, and C for the following transmission line: A 790 m length of 50 Hz power transmission line is ...
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1answer
853 views

Satellite uplink/downlink frequencies

Sorry if this was asked before. I was unable to find such a question elsewhere in SE. Why does space-wave communication (ie/ satellites) utilize different ground-station (GS1) broadcast and satellite ...
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1answer
1k views

Using of RF transcieivers to communicate over 230VAC powerline

Initially I need to communicate between several devices placed within one appartment (or a building). All those devices will be connected to 230 VAC power line. I'd like to skip any wireless ...
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2answers
8k views

Insertion Loss vs Transmission Loss

Today I was told that something was causing Transmission Loss and not Insertion Loss. Can someone clarify what these two phenomena are? I always thought they were the same thing expressed in dB or dB/...
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3answers
3k views

How do utilities calculate transmission lines impedance?

I'm an electrical engineering student getting into Transmission Circuit Analysis, and a question came out to me: How do utilities measure their transmission lines impedance? Do they use special ...
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4answers
14k views

What are the main causes of Overshoot and undershoot of a signal?

I'm not an EE major, but I was curious what causes overshoot and undershoot. Where can i find a detailed explanation of the process? I heard it has to do with the parasitic capacitance, but there ...
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2answers
1k views

Send data to an Arduino by using an audio cable

I want to send some Data to my Arduino by using the audio jack of my smartphone/computer. (USB is no option, since my smartphone does not support USB Host mode and I also don't want to go wireless or ...
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1answer
113 views

HC06 Weak Transmission

I have been working for a while with a HC06 bluetooth module along with an Atmega 168A microcontroller and everything was fine until a day ago when the bluetooth transmission just went off. Data is ...
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2answers
7k views

Why is it desirable to inject reactive power into a transmission system?

This website explains the basics of FACTS technologies and how they can be used to exchange active and reactive power with the transmission system, namely: SSSCs - can exchange active and reactive ...
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10answers
5k views

Is there any way to use half-bits?

As most people here know, by using 4 bits, we are able to count from 0 to 15 (0123456789ABCDEF in hexadecimal). But if we were to only count up to 9, we would still be using 4 bits, and the digits ...
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2answers
399 views

Characteristic impedance of a transmission line

characteristic impedance of a transmission line depends on frequency of transmission as can be seen by its expression. What will be the characteristic impedance of TL if my signal has two frequency ...
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1answer
628 views

Send digital data over same wire as analog data

I am trying to modify an existing circuit that I am able to send another digital signal over the same connection. My circuit is a so called "Partyline Intercom" which is based upon the schematics of ...
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3answers
988 views

Load sharing using asynchronous motors

I am involved in the design of a system composed of: multiple asynchronous motors, each equipped with separate drive, all acting in parallel on a load, via a common rack and pinion transmission. As ...
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2answers
2k views

Double Side-band Amplitude for Radio Transmission & Single Side-band Reduce Carrier for Point-to-point Transmission

What are the reasons which lead to the use of double side-band amplitude for radio transmission, and single side-band reduce carrier working for point to point transmission? Thank you for your help.
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2answers
106 views

communication 101 [closed]

I have a couple of really basic questions. (1) When a device(Device 1) communicates to another device(Device 2), do the devices have to operate in the SAME frequency for the data transmission to take ...
1
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0answers
785 views

How to get fourier series of 8-bit character to be transmitted?

I have been reading this in a book, but can't understand how he used the 8-bit in fourier series equation to get the result below. The transmission of the ASCII character ‘‘b’’ encoded in an 8-bit ...
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1answer
1k views

Power loss during transmission

I have no background of electrical engineering so if my question sounds stupid then accept my apology in advance. I want to calculate the power loss during the transmission. I am using the simple ...
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10answers
37k views

Why are there only 3 wires on this power line?

When I was in Alaska, I saw a high voltage line, but I didn't see the Neutral. Is this because the water is conductive enough next to it to use as neutral? Or is it just two Phases. Where I live, ...
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10answers
5k views

Schematics for a simple radio transmitter that can be built only with passive components?

Fantasized in some of the survivalist, post-catastrophic novels, movies or docudramas is the radio built only with handcrafted or scraped components. Beyond the popular appeal of this stories, I ...
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1answer
131 views

How to transmit CAN signals wirelessly without line of sight (LOS)

I have a scenario where I have an OBD-II interface transmitting data via CAN across six wires to a display. I will have power on either side of the wires, but I cannot assume that the wires will have ...