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Questions tagged [coaxial]

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Coax cables, impedance matching and BNC extensions

I'm trying to understand how to do proper measurements with a Voltage Differential Probe ( TT-SI 9010. This probe has an output impedance of 50ohm and has a BNC (It doesn't specify it in the data ...
Santi Ospina's user avatar
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0 answers
339 views

Reconnecting an external Wi-Fi antenna to a camera PCB. Where and how?

I own a BirdFy Netvue bird feeder. It has a Wi-Fi camera to capture pictures and video clips as the birds come to feed. Unfortunately, the squirrels completely severed the camera antenna. I bought a ...
Ioannis K. Moutsatsos's user avatar
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1 answer
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What are the outputs from my cable?

I am in the process of building a microphone connected to a Raspberry Pi Pico. To check my expectations are correct, I have bought a pre-assembled electret mic and amplifier. The issue I have, is I ...
user10709800's user avatar
1 vote
3 answers
107 views

Why does the length of an RG-316 coaxial cable affect the crystal resonator frequency response?

I was measuring a 32 [kHz] crystal resonator using a ZURICH HF2LI with 50 ohm input and found that the length of the coaxial cable will affect the frequency response or have a little difference at ...
Jack Huang's user avatar
1 vote
3 answers
775 views

Coaxial quality and frequency rating

Context I aim to start playing with RF and the first thing I wish to do is some EMI tests. I've been watching YouTube videos on the matter as you do, and I've seen plenty of people using SMA ...
TrisT's user avatar
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In what direction does skin effect take place?

I'm working with some problems with coaxial cylinders and the currents driven in those when considering high frequencies. In such cases, the skin depth has to be taken into consideration. One thing I ...
Tanamas's user avatar
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1 answer
254 views

Monopole antenna integration

When using whip style monopole antennas (similar to those found on a Baofeng push to talk radio) as feeds for software defined radios, what “quality” of ground plane is required for best performance? ...
user1858431's user avatar
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129 views

AC - impedance for a coaxial cable

Problem I want to calculate the AC impedance for a coaxial cable. A rough image is presented below: Because we have an AC current, suppose that the skin depth, which we can define as \$\delta\$ is ...
Tanamas's user avatar
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How to calculate voltage drop across a coaxial transmission line?

I am an engineering student and I want to ask a question for my assignment. How can I calculate voltage amplitude drop across a coaxial transmission line without input function? (How many percent of ...
jjk's user avatar
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1 answer
101 views

What happens to the signal and antenna pattern when the coaxial shield of the feedline is severed?

Assuming a single-shielded coaxial cable connected between a transceiver and antenna, what would happen to transmitted signal and the antenna's radiation pattern if at some point along the feedline ...
Macuser's user avatar
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1 answer
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What do I need to connect an R-SMA male to a standard coaxial male? [closed]

I have a router that has the following type of pigtail connector soldered to the board which I believe is an R-SMA male coaxial cable. I'd like to connect it to a standard male coaxial cable that's ...
Bobby's user avatar
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1 answer
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How is the center pin supported in air-filled coaxial cables?

In SMA cables, the PTFE dielectric supports the center pin through the length of cable. How is the center pin supported in air-filled cables? E.g., 3.5mm, 2.9mm, K-connector, 1.8mm, V-connector, etc. ...
qtc0's user avatar
  • 107
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2 answers
191 views

Coaxial 75ohm cable parallel to electrical mains 127V AC @ 60Hz

Everywhere we look at, the same recommendation is made: "never run coaxial cable parallel to electrical cables". Well, I get it, but.... I have no other option™. More than that, those cables ...
rslemos's user avatar
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2 votes
3 answers
401 views

Effect of small length impedance discontinuity in a transmission line

Consider this arrangement of a radio, a long coax cable, a small length of "random" cable and an antenna. The radio, the coax and the antenna all have the same impedance, but the random ...
Berk7871's user avatar
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1 answer
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Can telescopic FM/DAB antenna be replaced by Coax?

I tried to search for this prior to asking but with no luck... I have an FM/DAB+ antenna like this: from which a standard 75-Ohm Coax is coming down and I would like to connect it to the radio (...
player0's user avatar
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2 answers
2k views

Can coaxial TV aerial cables be flat/ribbon? To go under thick rug for TV opposite aerial socket

A round shaped one would cause a ridge in the carpet. I already have setup a flat ethernet cable under the rug for similar scenario whereby device is opposite ethernet socket. Update it's to carry DVB-...
therobyouknow's user avatar
1 vote
1 answer
100 views

What energy/fields if any is generated when radio frequency is passed through a coaxial cable?

I am new here. Just had a question wondering if someone could answer. Let's say I have a generator that can generate RF and send it through a cable (coaxial) if I attached the end of that wire to a ...
Longschool's user avatar
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
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1 vote
4 answers
2k views

When does one have to take cable capacitance into consideration?

When feeding an RF signal to a coaxial transmission line, when do you have to take into consideration the capacitance of the cable? I am working with a 36 MHz signal. The total cable length is ~3 ft (...
D. Zambrano's user avatar
-1 votes
1 answer
265 views

Does Multisim have coaxial cable? What simulation application can I use that has coaxial cable?

I want to use coaxial cable in a simulation. Is it available in Multisim or another simulation program?
Ahmed Hany's user avatar
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0 answers
153 views

Ampere's Law with dielectric

I am asked to calculate the magnetic-field-strength and magnetic-flux-density for different regions inside a coaxial-cable. I found Ampere's Law for that, but it uses \$\mu_0\$ , and the coaxial-cable ...
LeonTheProfessional's user avatar
1 vote
1 answer
112 views

Coaxial Transceiver - HF Signal & LF Signal on same cable

I have a project which needs a analog video signal & some control data sent on a coaxial cable, I came up with some ideas and I asked about it and some interesting answers were received (Multi &...
Stefan Merfu's user avatar
1 vote
4 answers
1k views

Attenuation for high frequency when using coaxial cable

Can someone tell me why high frequencies (1 MHz sine signals) are getting attenuated in the below case. I have a function generator with 600 Ω output impedence. I connect this output to a digitiser ...
jerryvdk's user avatar
1 vote
4 answers
546 views

How can I match a transmission line impedance on the source side?

Suppose that I want to transmit a signal by a coaxial cable to a high-impedance load. The signal is a single-ended TTL (3.3V) single square impulse from an FPGA output. The package of the FPGA is LQFP-...
Arseniy's user avatar
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1 vote
3 answers
135 views

Coaxial Connector Termination

I am studying microwave engineering at university, but I never had a possibility to try to manufacture anything that I have been learned in my courses. So I have decided to try it by myself. I have ...
Humphrey Appleby's user avatar
10 votes
3 answers
2k views

What does "mode-free" mean, in the context of coaxial connectors?

I've seen a number of coaxial connectors claimed to be rated for "mode-free operation up to (whatever) GHz"--but after much searching, I can't seem to find any definition of "mode-free&...
Hearth's user avatar
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1 answer
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What to do when studying "travelling wave" in a coaxial cable?

Propagation of travelling waves on cables may sometimes be difficult to apply and understand. There is a method called in french "abaque de Bewley" or "diagramme de Bergeron" (in ...
Antonio51's user avatar
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580 views

Coaxial Cable Wiring on PCB (WiFi-Card)

*This post is just serving it's purpose as a discussion in case somone chance upon the same situation as me I'm really really new to this, so please bear with me. I got this PCIE wifi card from China, ...
Larry Lee's user avatar
0 votes
1 answer
82 views

Multi "Master "Coaxial Driver Design

I have an application which requires sending PAL video signal & UART infomation over a 50R coaxial cable without disrupting the PAL protocol while doing it, the total length of the cable is around ...
Stefan Merfu'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
1 vote
1 answer
129 views

Why do some SMA connectors have a rectangular center pins?

I came across an edge mount SMA connector where the soldering portion of the center pin is rectangular rather than round like normal. My initial assumption is a stronger solder joint. Any other ideas? ...
Joel's user avatar
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1 answer
214 views

Connect antenna to FM circuit

I designed a Colpitts oscillator with a single transistor amplifier stage. I now have to connect the antenna to the circuit through a coaxial cable. Do I have to redesign the output impedance of the ...
CuriosityStrikes's user avatar
1 vote
1 answer
416 views

How to select a coaxial cable for 5kV DC and 0.1 mA

I need to select a coaxial cable that is safe to use with a DC voltage of up to 5kV DC and very low current - less than 0.1 mA. This cable will be used to supply power to a microchannel-plate (MCP) ...
user64860's user avatar
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0 answers
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Name of a single-conductor coax test cable

Alright, bit of a silly question but I can't seem to get Digikey or Mouser to show me what I want. I'm wanting to replicate Fig. 7 of this INA116 datasheet almost exactly. Before I go and buy this ...
PoGaMi's user avatar
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2 votes
1 answer
176 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
1 vote
3 answers
5k views

Derivation of resistance of coaxial cable

As given here, the derivation of Resistance for Coaxial Cables Consider a coaxial cable of length \$L\$, consisting of a cylindrical conductor of radius a surrounded by a cylindrical conducting shell ...
AndroidV11's user avatar
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1 answer
85 views

The coaxial cable is claimed to show the highest common inductance (M) relative to any other cable configuration?

The coaxial cable is claimed to show the highest common inductance (M) relative to any other cable configuration [Henry W. Ott, (1988), Noise Reduction Techniques in Electronic Systems, 2 Ed., AT&...
austen's user avatar
  • 5
3 votes
1 answer
334 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
0 votes
1 answer
714 views

Very old dual coaxial TV outlet, how to fix it to connect to a modern TV? [closed]

i've recently moved into an older updated apartment building and want to connect to the TV outlet but have a connection that i've never seen before. Can someone point me in the right direction of how ...
meak21's user avatar
  • 21
1 vote
2 answers
301 views

Coaxial cable in IT Earthing System

We are developing a shipboard system which needs to be connected in a IT network (Unearthed neutral). In order to comply with this scheme we need to avoid negative-grounded, as all the metal ...
Dhargon's user avatar
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1 vote
1 answer
221 views

Coaxial cable test with VNA to estimate Wave Velocity and Attenuation

I'm doing a lab course concerning microwave measurements, during which I'm supposed to test an open, short and 50 Ohms terminated coaxial cable. The cable is connected to a VNA at the S_11 port and ...
e63acd's user avatar
  • 11
0 votes
1 answer
818 views

How does the shield of a coaxial cable work?

let's consider a coaxial cable with only two conductors (the core and the external metallic shield), and let's consider the case in which it propagates TEM mode at a certain frequency: My question is:...
Kinka-Byo's user avatar
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1 vote
1 answer
260 views

disagreement between theoretical calculation and measurement of upper cutoff frequency of a circuit based on RG58 coaxial cable

For a 100 meters RG58 coaxial cable, according to the datasheet, the capacitance of the cable is 10 nF and the inductance is of 25 µH approximately. A sinusoidal voltage is applied at the input of the ...
moumi Lelion's user avatar
1 vote
2 answers
159 views

Why/How alternating currents through coaxial cable do not interfere with each other?

I know that cable TV use coaxial cable with alternating current frequencies varying from 5 MHz to 750 MHz. Why/How a alternating current of, for example, 5 MHz , 10 MHz, 20 MHz, 100 MHz, 300 MHz, 500 ...
sergio trajano's user avatar
1 vote
0 answers
152 views

Making my own coaxial hardline

I need about 50mm of coax hardline. I don't have any at home, but I do have a lathe, some copper, and some teflon stock. Can I make my own coax hardline on the lathe? According to my calculations, ...
hjf's user avatar
  • 1,181
1 vote
2 answers
95 views

Coaxial connector pins on dielectric

I have a single-side ifa antenna design to which I wish to solder a coaxial feed. Now, I only have this female SMA connector with 5 pins on the otherside that I wish to solder to my PCB. This may ...
Jaacob's user avatar
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1 vote
0 answers
69 views

What would you call a cable which combines both a coaxial transmission line and regular conductors?

I'm looking for a cable that can carry both dual supply (+5V and -5V at <100mA) DC power and a relatively high bandwidth analog signal. The intended application is powering the amplifier of an ...
jms's user avatar
  • 8,661
0 votes
1 answer
108 views

Ultra Miniature Coaxial connector what does 50ohm stand for

In my current project I designed a PCB board for the ESP8266EX chip. Instead of making an onboard antenna, like in the datasheet described, I have placed this connecter. The goal is to be able to ...
Zunzulla alagaty's user avatar
16 votes
5 answers
3k views

How are unbalanced coaxial cables used for broadcasting TV signals without any problems?

As far as I know, in telephony STP or twisted pair cables are used. This creates balanced line impedances which is useful to mitigate for common mode related interference. So using balanced cables in ...
user1245's user avatar
  • 4,333
7 votes
4 answers
290 views

Can two 802.11n devices communicate via a coaxial cable?

Coaxial cables with RP-SMA connectors are often used as extensions for external antennas / with software defined radios. What would happen if I were to connect two access points (wifi chips, via ...
Geosearchef's user avatar