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Questions tagged [transmission]

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3
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1answer
40 views

how will a connector affect a transmission line?

I am laying out an RS485 driver and read a few design guides which recommend a 120 Ohm termination resistor. This makes sense since the characteristic impedance of twisted pair cables is in the 100 ...
0
votes
0answers
50 views

Small solar power threatens grid TGFOV?

Can solar power systems under 10 kW, single phase, with micro-inverters pose a threat to grid reliability due to a threat from Transmission Ground Fault Over-Voltage? I have researched this topic ...
0
votes
1answer
112 views

IR transmission power controlling

Maybe this is a big topic, I will explain my problem. (Reworded) If you want to adjust the distance IR communication can reach, you will face this problem: transmission power adjustment. That means ...
0
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0answers
36 views

Power System question, point me in the right direction

As the title says, I don't want the assignment solved I just need someone to point me in the right direction. I have a transmission line with the following parameters: R=7 Ω, X=20 Ω, B = 140 μS. The ...
1
vote
4answers
123 views

Voltage transmission

For the sake of understanding, I shall refer to voltage as a "pushing force that causes electrons to move and hence generate current." Now, I know that this force is "built up" and does not flow(...
0
votes
1answer
36 views

Not full-wave signal transmission?

Is it possible to transmit half-wave signals repetitively, like repetitive "north" magnetic fields like going from 0-1 Gauss "north" and repeat however many times per second without going 0-north-0-...
0
votes
3answers
91 views

Convert kW generated per minute to kWh

I have the data of power generated by a solar panel per minute in kW. I need to calculate the total number of kWh generated per day. How do I do this? So far, I divided each value of kW by 60 and ...
2
votes
1answer
238 views

How to measure radio signal strength

I am building several types of radio antennas, and I would like to test which is the most effective. I am wondering: What is the best way to measure the strength of the received signal? It is at ~...
0
votes
0answers
19 views

XBEE S3 PRO loses comms beyond 800 meters with a 7dbi Antenna

My XBEE S3 PRO loses some packets when transmitting 800 meters away from the XBEE Pair. Even though we used a 7 dbi car antenna with sma jack. we used a jack converter from sma to rp sma (if that ...
-6
votes
1answer
61 views

How to calculate the transmission distance from satellite to earth (How to understand the formula) [closed]

I have this question in one of my tutorials and I cannot seem to find clarity in the question - I am trying to make an algorithm to do this all automatically but I need to understand the formula I ...
0
votes
1answer
100 views

How to understand Transmission and Propogation delay formula

I have three questions below. I would like to understand how their respective answers were reached, this is a question in my current class and everyone in the class has A-Level mathematics experience -...
0
votes
1answer
53 views

Friis transmission equation (log scale calculation)

I am trying to understand the Friis transmission equation. My scenario: I consider transmit antennas (\$T_x\$) and receive antennas (\$R_x\$) at a distance R [km]. f [GHz], \$G_{T_x}\$ and \$G_{R_x}\$...
0
votes
2answers
60 views

Is wireless technology only possible due to inductance?

I asked a friend how capacitative coupling works in glass-mount antennas. He said it's like when installing a sound system; where you want to keep the power & audio cables separated, to avoid ...
1
vote
0answers
45 views

Why is the top of the transmission line reflected pulse reduced?

I use this circuit to simulate the transmission line reflection, why the distortion occurs when the pulse signal is reflected back to the source. Only when the output impedance of the MOSFET pulse ...
2
votes
0answers
207 views

Parallel transmission lines impedance

I just want to know the correct way to calculate \$Z_{in}\$ in this network. It's very simple but I think I might be doing something wrong. Is it ok to calculate the impedance over one line and get \$...
-1
votes
2answers
118 views

How do electrons travel in data transmission wires?

I've searched and googled quite a bit on this subject, but haven't found any concrete answers. I understand that pulses are generated at the transmitter's end to get to the receiver's end. More in ...
2
votes
1answer
53 views

Edge betweenness centralities for distribution grids [closed]

Graph centralities like edge betweenness centralities are commonly used to study the vulnerability in transmission networks, can they equally be used to study radial distribution networks ?
-2
votes
3answers
338 views

Radio Transmitter Circuit [closed]

I have seen previous similar answers about radio transmission, but looking at the following scheme I am not sure about the role C3 plays in the circuit. I guess it is needed to remove the DC signal ...
0
votes
2answers
105 views

physics behind the impedance matching performed in this case

On the website here: basic impedence matching, I found a way one would pick the right value for your coaxial cable given the generator's impedance and load impedance. I've always been told to just ...
0
votes
1answer
29 views

source and channel encoding. can they be done together?

Why are source and channel encodings usually performed separately? Could they be made together? thanks!
0
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0answers
21 views

Topological observibility in OPP problem

I have a short question about observability analyzing constraint in optimal PMU placement problem in power system. Observability analyzing has two method: numerical and topological. Most of papers use ...
0
votes
3answers
64 views

What could be the transmission loss per metre of using DC current for a low voltage solar system?

I think that it shouldn't be much but I wanted to get a ballpark numerical figure. We've installed a 2kW solar power unit at our home, which is installed on our rooftop. To convert the DC current ...
0
votes
2answers
129 views

Measure transmission power of USRP [closed]

I am working with USRP(Universal Software Radio Peripheral) having power gain (mentioned in specifications) of 17dBm to 20dBm. I am using 3dbi omni-directional VERT900 antenna with it. I know the ...
2
votes
0answers
60 views

Y/Y/Δ or Δ/Y/Δ transformer for a series connected 12-pulse rectifier?

I'm aware that 30° shift is needed in order to obtain a 12-pulse rectification, however, I'm a bit confused about the configuration of these transformer. In most HVDC systems that appear in Alstom - ...
0
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0answers
68 views

Transmission gate simulation

When the voltage on node n-mosfet is a Logic 1, the complementary Logic 0 is applied to node active-low n-mosfet, allowing both transistors to conduct and pass the signal at IN to OUT. When the ...
0
votes
0answers
34 views

Multi-channel data transmission system for Pixhawk autopilot

I hope to connect multiple Pixhawk autopilots to one PC, to establish a simulation system. In case you are unfamiliar with Pixhawk autopilot, here is a brief introduction: Pixhawk autopilot is an ...
1
vote
1answer
55 views

Modulated IR for optical transmission of encoder data (TSOP 4840)

Some background: I am a mechatronics engineer and I have just recently started my first job out of university as an electrical engineer. I feel a little out of my depth but I wasn't going to turn the ...
0
votes
2answers
61 views

Force cellular modem to transmit at maximum power [duplicate]

I want to force my cellular modem to transmit at maximum power so that I can see if that is the cause of microSD card crashes that I have been experiencing in an embedded application. My modem is a ...
1
vote
1answer
44 views

From how wide a range of angles can a grid of dipole antennas efficiently receive a power beam?

This paper on solar power satellite concepts makes brief reference to the ground receiver receiving an elliptical beam due to the angle it is at to the transmitter (2nd paragraph). The angle isn't ...
8
votes
4answers
1k views

How can a low efficiency antenna be used for receiving but not for transmitting?

For the reciprocity theorem, if an antenna has a low efficiency in transmission, it has the same efficiency when receiving. In literature, it is usually said that one shouldn't use a low-efficiency ...
1
vote
2answers
267 views

Sending analog signal over twisted pair in noisy enviroment

I need to transmit several analog signals from one board to another (maximum 1m distance) in a very noisy environment (power electronics converter operating at 20kHz). The range of frequencies of the ...
0
votes
1answer
61 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 ...
0
votes
2answers
1k 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 ...
-3
votes
1answer
96 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....
-5
votes
1answer
104 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
votes
6answers
2k 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 ...
2
votes
2answers
947 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
votes
2answers
501 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 ...
-1
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2answers
3k 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 ...
1
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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 ...
1
vote
2answers
1k 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 ...
0
votes
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 ...
0
votes
4answers
1k 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 ...
30
votes
3answers
9k 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 ...
1
vote
1answer
276 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 ...
-2
votes
3answers
260 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 ...
2
votes
1answer
39k 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 ...
0
votes
1answer
7k 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
votes
3answers
114 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 ...
1
vote
4answers
423 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 ...