Questions tagged [transmission]
The transmission tag has no usage guidance.
158
questions
0
votes
1
answer
49
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 ...
4
votes
3
answers
677
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 ...
- 585
3
votes
2
answers
150
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 ...
- 237
0
votes
0
answers
127
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 ...
- 1
0
votes
1
answer
72
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)...
- 97
0
votes
2
answers
66
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 ...
0
votes
0
answers
47
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 ...
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 ...
- 288
1
vote
1
answer
103
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 ...
- 45
0
votes
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?
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 ...
- 337
0
votes
2
answers
141
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 ...
1
vote
2
answers
547
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 ...
- 35
23
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 ...
- 7,277
8
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 ...
- 327
0
votes
1
answer
98
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 ...
- 337
0
votes
2
answers
73
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 ...
- 337
-3
votes
3
answers
1k
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 ...
- 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 ...
- 11
-1
votes
4
answers
164
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 ...
- 11
0
votes
6
answers
332
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 ...
- 21
0
votes
0
answers
74
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 ...
- 3
0
votes
1
answer
100
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 ...
0
votes
0
answers
29
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 ...
3
votes
1
answer
196
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 ...
- 53
0
votes
0
answers
112
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 ...
- 53
2
votes
2
answers
1k
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 ...
2
votes
1
answer
162
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 ...
3
votes
2
answers
517
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 ...
- 33
1
vote
2
answers
283
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 ...
- 196
0
votes
1
answer
42
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 ...
3
votes
1
answer
314
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 ...
1
vote
0
answers
426
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?
- 11
2
votes
0
answers
60
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 ...
0
votes
0
answers
156
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 ...
0
votes
0
answers
148
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, ...
2
votes
2
answers
321
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 ...
- 23
1
vote
0
answers
48
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?
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 ...
0
votes
1
answer
653
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 ...
- 1
-1
votes
1
answer
178
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 ...
- 11
0
votes
0
answers
250
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
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 ...
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....
- 255
0
votes
1
answer
141
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 ...
- 49
-2
votes
2
answers
145
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 ...
- 111
-2
votes
3
answers
476
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 ...
0
votes
2
answers
230
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 ...
- 602
0
votes
0
answers
27
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. ...
user245472
0
votes
1
answer
123
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 data ...
- 331