Questions tagged [coaxial]

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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 ...
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1answer
26 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 ...
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1answer
58 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:...
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1answer
65 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 ...
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2answers
60 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 ...
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0answers
69 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, ...
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2answers
65 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 ...
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0answers
66 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 ...
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0answers
33 views

Twinax to Coax adapter

I'm being provided analog video over a twinax cable and I need to be able to feed it into a PC capture card for an at home hobby. Problem I'm encountering is most capture cards down take twinax. Has ...
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1answer
84 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 ...
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5answers
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 ...
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4answers
166 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 ...
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0answers
71 views

Permittivity measurement using open-ended coaxial probe

I am trying to understand how the complex permittivity of liquids can be measured using an open-ended coaxial probe. For this kind of measurement, we put a open-ended coaxial line into the liquid ...
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3answers
192 views

LC Filter Design with coaxial input and output

I was trying to design a Chebychev high pass filter of 400MHz corner bandwidth, 0.2db ripple and 5 poles. I am confused with the proposed design in this filter design calculator. This calculator asks ...
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2answers
49 views

Rogowski coil current rating

Is there any relationship between sensitivity of rogowski coil and voltage rating of coaxial cable with it. For example if I just have the sensitivity of the coil and spec of coaxial cable, is there a ...
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2answers
121 views

why is it bad if a coax cable (used for antenna cable) has multiple paths to ground?

I have an Internet modem/router device connected to a 20 foot LMR400 coaxial cable which uses N-to-N type connectors to connect to a 10 foot LMR400 cable, which is then connected into an ...
7
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1answer
550 views

Why did CATV standarize in 75 ohms and everyone else in 50?

All of the CATV industry runs on 75 ohm systems, while most of the rest of the radio world uses 50 ohms. Why was this standard chosen? I was wondering this because good quality RG6 cable can be ...