Questions tagged [transmission]

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2answers
83 views

Transmitting digital signal long distances, without complex parts

I'm controlling several multiplexers from NI DO modules. The multiplexers channel select inputs, A0-A4, are 5v. The DO modules output 5v TTL. On the bench I have everything working exactly the way ...
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0answers
32 views

Voltage regulation at full load

The voltage regulation is I(Rcosa -Xsina)/Vr For leading pf Here %of regulation=(VRcosa-Vxsina)/Vr ×100 %=((4×0.8)-(6×0.6))/100 ×100% =-0.4 Where I am doing wrong?
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0answers
42 views

Data transmission through multiple IoT devices

We are implementing a device which will have multiple sensors inside multiple houses in our local area. Each house will have 1 device fixed at a place and data will be transmitted to one central ...
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1answer
33 views

for calculating the number of insulator disks needed for creepage is line to line voltage or phase voltage used?

For example, I am calculating the number of disks required for a 330kV line. Assuming medium pollution (20mm/kV) and each disk having 405mm would my number of disks be 17 (based off line voltage) or ...
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1answer
90 views

WIFI over wires [closed]

So, guys I have made wifi gun a but it seems not working as there are a lot of trees between my friend's wifi and my home ( 1km distance ), So is there a method to convert wifi to wire and transmit ...
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0answers
32 views

How to make equivalent circuit diagram for 150 kV Lattice tower transmission?

How to make equivalent circuit diagram for 150 kV Lattice tower transmission. I need to make a EMTP simulation for lightning strike and see the effect to backflash over.
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0answers
28 views

How to calculate how much voice channels is being multiplexed

I would like to know how I could calculate from the bitstream which has a bitrate of 2,048 Mbps into how much voice channels is being used. I know that the syn has 32 bits and sign is 16 bits. Bitrate ...
0
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1answer
47 views

How to choose an appropiate antenna?

I want to increase the Bluetooth Low Energy transmission range of my ESP32 with IPEX connector. How can I select the right antenna? Do I have to take a look only at a 2,4 GHz WiFi antenna, the antenna ...
0
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6answers
113 views

how bits are still synchronized in asynchronous transmission?

I was reading a textbook which syas: In asynchronous transmission, we send 1 start bit (0) at the beginning and 1 or more stop bits (1s) at the end of each byte. There may be a gap between bytes....
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1answer
75 views

What is a good method for wireless transmission of images in a ~2km radius?

I am working on a project requiring regular image transmission over a 2km range. This needs to be done in an area with no cellular coverage. Energy efficiency is a factor, however it does not need ...
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2answers
90 views

Can anyone explain HVDC transmission to me?

HVDC transmission system sounds strange to me because I wonder why we would need it? We have HVAC transmission system which is much more efficient and less power losses. When we use the DC for same ...
-2
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3answers
61 views

HC-05 Bluetooth RF transmit power [duplicate]

The datasheet of the HC-05 Bluetooth module says the RF transmit power is up to +4 dBm RF, but I think that is for boundary value conditions. I am planning to use the it at a data rate of 100 kbps ...
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2answers
77 views

How far can the signals travel?

I want to build a centralized system which will be getting values from many sensors around an agricultural field. The field's large area leads to long wires going from sensors to the central ...
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0answers
19 views

Current Amplitude Distribution Lossless Transmission Line

I need to proof that the formula for Current Amplitude Distribution in a Lossless Transmission Line it's the following and I don't know where to start from... A little help would be appreciated. ...
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1answer
55 views

Conductivity and high speed transmission using aluminium slip rings

So I came across a Persistence of Vision globe based video where a YouTuber he makes DIY slip rings to power and control some LEDs as seen in this picture: My question is, given the high rate of ...
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2answers
64 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
799 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
37 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 ...
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2answers
59 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 ...
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0answers
56 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
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1answer
132 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). ...
2
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1answer
127 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
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3answers
273 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
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1answer
93 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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1answer
161 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 ...
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4answers
137 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
39 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-...
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3answers
984 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 ...
3
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1answer
1k 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 ~...
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1answer
109 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 ...
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1answer
475 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 -...
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1answer
182 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}\$...
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2answers
67 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
386 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 \$...
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2answers
186 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
57 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 ?
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3answers
485 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
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2answers
190 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 ...
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1answer
30 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!
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3answers
162 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
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2answers
192 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
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2answers
156 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 - ...
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0answers
125 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 ...
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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
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1answer
80 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 ...
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2answers
74 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
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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
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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
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2answers
673 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
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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 ...