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Questions tagged [transmission]

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Why does my calculation for transmission line reflection and transmission at a load have infinite solutions?

Take a transmission line with some characteristic impedance and insert a load somewhere along the line. What are the transmitted and reflected signals, given an sinusoidal input. Physically this ...
ions me's user avatar
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2 answers
113 views

High speed data transfer from STM32 to the PC

What is the best way to transfer high-speed data (12.288 Mbit/s) from the STM32H723 microcontroller to a PC? I'm controlling a four-channel audio codec (AK4619vn) and need to sample the FFT of the ...
Yusuf Dolu's user avatar
0 votes
0 answers
39 views

TM transmission coefficent derivation

Please help, I have exams and I am not sure if my derivation for transmission coefficient for TM case is correct.
Cillantro's user avatar
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1 answer
90 views

STM32F103 UART DMA transmits corrupted data sometimes

I`m using STM32F103CBT6 core with UART via DMA on 9600 baud rate. The device in idle state transfers data between controller and bill validator unit. In the same time I`m sniffing the data that are ...
Nazar Diadiun's user avatar
4 votes
3 answers
681 views

Has any design successfully used rolling element bearings to conduct current reliably?

I am curious about using a rolling element bearing (several) to deliver either signals, processing power, or even drive power to a rotating shaft. As I understand, all bearing manufacturers discuss ...
J Collins's user avatar
  • 585
3 votes
2 answers
156 views

Why is the insulator missing for one of the transmission lines?

Why is the insulator missing for one of the transmission lines? Apart from the top line (earth) I would assume that all the other lines need an insulator. It's the same for the next poles. This is in ...
Johannes's user avatar
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0 answers
129 views

How to find the strongest frequency in a signal using a microcontroller/circuit?

I am trying to implement a low-power backscatter transmitter+receiver and ran into some trouble on the transmission side. Setup: My transmitter circuit sends a 50MHz wave, which the receiver circuit ...
Andy K's user avatar
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1 answer
84 views

Feeding multiple analog video channels onto a common bus - signal integrity issue?

Consider the following simplified schematic: The intention here is to have multiple analog video input channels selectively coupled trough an analog switch onto a shared bus (this bus will be on a PCB)...
nonius's user avatar
  • 97
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2 answers
67 views

What's wrong with the tx circuit?

Whenever I connect the power source, the transformer heats up, measures 0v AC and rectifier doesn't measure any voltage in DC. I feel there are components I need to add to the tx circuit. I'm trying ...
Afolayan mosopefoluwa's user avatar
0 votes
0 answers
48 views

How phase is modulated according to our message signal?

My question: let message signal m(t) be sin(w1t).For frequency modulation (instantaneous phase deviation=phi(t)) d[phi(t)]/dt=kf m(t) so i get that at 90° or π/2 frequency will be max because the ...
user305532's user avatar
7 votes
5 answers
2k views

Why don't we use the Earth to transmit electricity?

Think about it, instead of transmitting electricity in 2 wires, we could only use one: Why don't we just do it? I think they do it in three-phase transmission by connecting the neutral phase to the ...
İbrahim İpek's user avatar
1 vote
1 answer
122 views

Why the increase of the Spreading Factor (SF) by one, in the LoRa modulation, results in doubling of the transmission time of a symbol (T_symbol)?

Recently, I have been reading about the LoRa modulation and I am curious, why the symbol transmission time (T_symbol) doubles, if the Spreading Factor (SF) is increased by one. The SF is equal to the ...
pstr's user avatar
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1 answer
40 views

Do the number of corona rings affect corona formation?

Does having two corona rings instead of just one on the line end of a tension insulator string help with corona formation?
Axel Witzel's user avatar
1 vote
0 answers
77 views

Is there a way to sense the characteristic impedance of a transmission line?

Is there a way to sense the characteristic impedance of a transmission line? If a transmission line between a driver and a receiver is 50ohm, is it possible to design a circuit at the receiver end to ...
kintaro's user avatar
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0 votes
2 answers
146 views

Quarter wave transformer

I appreciate help on a confusion regarding a quarter wave transformer. When reflections at the feed-line on a transmission line are eliminated, how is all the power absorbed by the load when there are ...
maritine_flesh's user avatar
1 vote
2 answers
618 views

Deriving power formulas for transmission lines

I'm trying to derive formulas for active power (\$P_s\$) and reactive power (\$Q_s\$) at the sending end of a transmission line shown below: Where: \$E_s\$ and \$E_r\$ are voltage magnitudes \$X\$ is ...
Dan's user avatar
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24 votes
9 answers
4k views

Single wire (no ground wire) long distance low frequency communication

In a cave we are currently exploring, there is a temporary siphon that sometimes blocks our way. I was thinking about monitoring it (pressure sensor or other level sensor at the siphon, transmitter ...
Sandro's user avatar
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9 votes
1 answer
1k views

Why are coaxial cables typically faster/longer than twisted pairs?

I'm having trouble understand why coaxial cables tend to have higher bandwidth compared to twisted pairs. I couldn't find any source explaining why, they just mention the fact. For instance: "In ...
Essam's user avatar
  • 337
0 votes
1 answer
108 views

Impedance matching at the generator side or the load side?

For impedance matching, are we matching in between the generator impedance Zs and Zin, or matching between the Z0 and ZL? or both? Similarly do we add the matching network in between Zs and Z0, or Z0 ...
kintaro's user avatar
  • 347
0 votes
2 answers
78 views

Impedance calculation issue

I am a strange calculation of Zin, Zline and ZL. As tan(pi/2) is 0, why can't we just cancel the j part, and yield Zin = ZL but as it demonstrated, using tan(pi/2) to divide, which should not be ...
kintaro's user avatar
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-3 votes
3 answers
2k views

The speed of light is 3*10^8 m/s and data transmission rate of optical fiber is ~100 Tb/s, how do we calculate data transmission rate?

How do we calculate data transmission rate? Is there some formulas that is involved? Fiber optic cables beat copper in this department, and it isn’t even close. Fiber optic cables are made of tiny ...
cuajiu's user avatar
  • 1
-1 votes
3 answers
2k views

Why is digital transmission more efficient than analog transmission?

it is possible to send more data through a given circuit using digital rather than analog transmission Slide says the above thing but I am not really able to grasp this. How can we send more data in ...
preeti's user avatar
  • 11
-1 votes
4 answers
171 views

In radio transmission, aren't all forms of modulation ultimately FM?

This is a very basic question, but I am confused by this. All forms of radio transmission result in sidebands or a frequency range (channel) that is used to carry the data. Even AM somehow results in ...
qbccd's user avatar
  • 11
0 votes
6 answers
366 views

Simplest way to transmit digital data?

I have an interesting problem that's been wrecking my brain and would like some help with it. Basically what I have is a voltage readout box that has a few voltage displays on it. I would like to ...
Lazyroot's user avatar
0 votes
0 answers
77 views

Maximum Achievable distance, given the maximum delay, in optical fiber (single mode) and ethernet?

I have the following problem to solve. I have to find the maximum achievable distance between two nodes of a network, given the maximum delay possible between them. The connection can be single mode ...
Matt193's user avatar
0 votes
1 answer
104 views

Why my television provider doesn't measure the coaxial cable length?

I recently put cable TV in my room (we already had cable TV before, but not in my room). The technician from my TV provider, through a split, ran a coaxial cable up to the TV in my room. When he did ...
Rodrigo Pozo's user avatar
0 votes
0 answers
31 views

Insulation and losses In transmission line

Why do we consider only P=V.I In AC transmission while designing the insulation of transmission line not the equation P=V^2/Z and consider this equation in determine the insulation in DC transmission ...
Sudhanshu Ranjan's user avatar
3 votes
1 answer
209 views

SPI clock behavior question

Question What is causing intermittent switching on the SPI lines of my Xilinx SoC? Background I am attempting to control a Texas Instruments LMX2572 frequency synthesizer over SPI using the code ...
Mark Musil's user avatar
0 votes
0 answers
115 views

Custom board causing strange oscillations on SPI lines

Question What could be causing the following corruption on my SPI lines? Background I have designed a daughter board which is connected to a Bajie Development board (first listing on this page). The ...
Mark Musil's user avatar
2 votes
2 answers
2k views

How to terminate Shield of USB connector to System Ground via Resistor || Capacitor or Ferrite Bead?

I want to know the best approach to connect USB connector's (receptor) Shield to System Ground? Below are the two options. PC(Earthed)<----- USB Cable ----> USB Connector female(PCB with NO ...
Electric Monkey's user avatar
2 votes
1 answer
177 views

Is an (n+1/4) wavelength transmission line impedance transformer comparable to a 1/4 wavelength line of the same composition?

I use coaxial transmission line transformers for simple power splitting and combining networks. This is for connecting multiple resonant antennas in array configurations. It's a standard technique ...
Captain Kirchhoff's user avatar
3 votes
2 answers
520 views

What makes RF transmission so efficient?

I'm a layman in this field. I have a question about RF transmission. How does the data transferred by RF waves (for example in mobiles, wifi) reach the users accurately in spite of losses during ...
CHEMOJEE's user avatar
1 vote
2 answers
286 views

Sanity check: would this configuration work to address an item in a grid?

This is a follow-on to this question. The circuit that I have in mind is represented below. simulate this circuit – Schematic created using CircuitLab The idea is that I want to be able to ...
John Doe's user avatar
  • 196
0 votes
1 answer
43 views

In discrete memoryless channels what is meant by output probabilities?

In my book it is mentioned that P[Y]= P(X)* P(Y/X) Where P[Y] is the output probability matrix, P(X)=input probability matrix, P(Y/X)= channel matrix. I understand the physical significance of input ...
Vasvi Sood's user avatar
3 votes
1 answer
335 views

Can someone explain me these waveforms?

During this experiment, I connected a 10m coaxial cable to pulse generator and at the load end I connected capacitor and inductor one by one, I got these waveforms. Can someone explain me the the ...
Jaimin PARMAR's user avatar
1 vote
0 answers
453 views

creating symbol for Transmission gate switch in ltspice

I need to create a symbol of transmission gate to use but when putting its symbol I get a message "unknown subcircuit called in xx1_nc01_nc02_nc03_nc04 how may I fix it?
Daniel's user avatar
  • 11
2 votes
0 answers
63 views

Transmission distance with AM2320 temperature and humidity sensor

I'm about to work with a temperature/Humidity sensor, this sensor has to be wired more than 5m and less than 10 m to my PCB board, I was going to use the SHT3xx sensors, these sensors work with I2C ...
joshua andres blanco jerez's user avatar
0 votes
0 answers
160 views

What does it mean to short circuit a transmission line stub at a specific frequency?

I'm currently designing a microwave FET mixer right now, and I have to short-circuit the FET's drain at LO frequency and its harmonics. I've checked the "stub" article in wiki, and it says ...
Bálint Csejtei's user avatar
0 votes
0 answers
164 views

How can I simulate microwave radio link transmission?

My task is to simulate a two-way data transmission microwave link. The fixed parameters are distance, transmitter power, carrier frequencies, bandwidth, receiver noise figure, intermediate frequency, ...
Bálint Csejtei's user avatar
2 votes
2 answers
358 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 ...
Steve's user avatar
  • 23
1 vote
0 answers
49 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?
Camila's voice's user avatar
1 vote
0 answers
54 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 ...
Sahil Pasricha's user avatar
0 votes
1 answer
727 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 ...
Chris's user avatar
  • 1
-1 votes
1 answer
194 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 ...
ElementX's user avatar
0 votes
0 answers
261 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 ...
Jossver Kraan's user avatar
0 votes
1 answer
55 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 ...
Augustinerhelles's user avatar
2 votes
6 answers
1k 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....
amjad's user avatar
  • 255
0 votes
1 answer
158 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 ...
R. Fitz's user avatar
  • 49
-2 votes
2 answers
150 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 ...
Akash. B's user avatar
  • 111
-2 votes
3 answers
485 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 ...
Utkarsh Ghadge's user avatar