Questions tagged [transmission]

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votes
3answers
93 views

Send 200 Hz signal over 200 meters in realtime

I have a RC car with a G-Force sensor. The data is converted to an audio signal with frequencies between 0 and 200 Hz. I would need to send this audio to me. The requirements for this are: low ...
0
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0answers
52 views

Video transmission wirelessly [closed]

I need to transmit a video file wirelessly. Its size will be 3Mb maximum. Resolution depends on the video and i can change the fps value as i wish. The video file will be given in a SD card or a ...
0
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2answers
38 views

What is the effect of the reflection coefficient?

I know that the reflection coefficient is the ratio of the backwards wave with the forward wave in terms of the characteristic and load impedances. But what does this mean? Does this represent a loss ...
3
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3answers
410 views

What would cause a square wave to become rounded?

I have a square wave going through a thousand feet of cable. The cable has \$120 \,\Omega\$ characteristic impedance. I measured the capacitance and inductance of the cable and they are pretty close ...
0
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2answers
32 views

Pspice modeling of transmission line

I'm trying to model a differential digital signal going through 4000 feet of twisted shielded pair. The nominal impedance is 120 ohms and capacitance per foot is 14.6 pF. For 1000 feet I calculated ...
1
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2answers
47 views

Pulse Down a line with Series terminations between transmission lines

I am interested in a relative edge case in transmission line of a simulation. If send a pulse down the setup below, now obviously my rudimentary steady state electronics knows this is a basic voltage ...
0
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0answers
54 views

Single-ended analog signal to differential

I need to transmit 2 analog signals over a cable in a noisy environment. How to transmit them as differential ? Given that : Each signal can be used to inject and receive current (< 130 kHz, &...
2
votes
1answer
116 views

How to transmit analog signals over cable?

In my current project, I need to transmit 4 analog signals (A1, A2, A3 and A4) on a cable from one PCB to another. I am working at 3 VDC and the distance between them is relatively short (< 30 cm). ...
0
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0answers
41 views

AC resistance of LVAC transmission line

I'm currently working on a project to determine the transmission losses in an LVAC line, as part of an off-grid distributed generation system. The manufacturer of the cable has given me a DC ...
2
votes
1answer
76 views

Differential pairs or single ended signals for 1m cable

I have one control board and 3 additional boards for the power electronics, that send and receive data from the control board over a distance of ~1m (3ft). All signals are single ended. I have to ...
3
votes
3answers
178 views

Is the impedance control of differential pair traces a transmission line problem?

I read in an article of design reference that "If the length of the interconnect PCB is greater than 1/10 th of the wavelength, we should consider using the transmission line instead of ordinary ...
3
votes
1answer
64 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
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0answers
60 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
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1answer
137 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
37 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
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4answers
131 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
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1answer
38 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
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3answers
319 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
854 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
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0answers
20 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
90 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
284 views

How to understand Transmission and Propagation 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
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1answer
141 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
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2answers
63 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 ...
2
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0answers
320 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
166 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
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1answer
55 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
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3answers
432 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
158 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
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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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3answers
83 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
176 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 ...
4
votes
2answers
105 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
92 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
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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
67 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
65 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
47 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
2k 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
458 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
63 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
99 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
113 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
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 ...
2
votes
2answers
1k 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
600 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
4k 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 ...
3
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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
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 ...