Questions tagged [coax]

Coaxial cable, or coax, is a type of cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield.

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2answers
9k views

Effects of impedance matching between 50 and 75 Ohm coaxial cables for 10 Mbit/s, Manchester-coded signals (20 MHz)

TL,DR: This is quite a bunch of text because I have included plenty of background info. However, there will finally be a good, and precise question: Should I use an impedance matching network when ...
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2answers
33 views

Coaxial cable terminology : how to read?

I need to understand the nomenclature used for coaxial cable. For example: UT-085-SS-SS, or UT-085-SS, or UT-085-NbTi As far as I understood, the number 085 here is the total diameter of the cable ...
16
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2answers
7k views

Can I solder a RG316 coax directly to a PCB instead of using the intended SMA connectors?

I have a length of RG-316 single shield 50Ω coaxial cable carrying a 5.8 GHz signal that I need to connect to a PCB. While cheap relative to most coaxial connectors, SMA connectors are still quite ...
14
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1answer
2k views

Is it possible to reject noise traveling on the outside of a coaxial transmission line?

Say I have some ordinary coax between a receiver and an antenna. That coax will have three currents in it: the desired signal an exactly equal an opposite current on the inside of the shield (really, ...
8
votes
4answers
2k views

Are there types of standard coaxial cable with a propagation velocity of 0.9c? What would be the application?

Reading this answer I was surprised to hear that there are "excellent" kinds of coaxial cable with a propagation speed of 0.9c; 90% the speed of light. The bargain basement number is about 2/3c, and ...
5
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3answers
290 views

Coax Impedance Explanation

I have been trying for a while to understand Coaxial Cable impedances for ham radio etc. use. I only know what it is not though. Coaxial Cable does not measure the rated impedance from one end to the ...
2
votes
1answer
142 views

Time domain reflectometry (TDR), initial pulse slope

A ~100kHz square wave through a 100m open end coax (RG-58) produces a slightly sloped shoulder during the time from initial pulse until reflected pulse (A-B), and from initial pulse drops until ...
2
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5answers
2k views

Coax cable - capacitive load

I still have an understanding problem with impedance matched coaxial cable and its behaviour. We do impedance matching to prevent reflections. How does my signal source see the whole cable? At a ...
1
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1answer
247 views

Two different length antennas can cause problems?

I am using two 443 MHz transceivers (FY-605 transceiver) with both having different antenna lengths. One antenna is around 12cm long and the other antenna is around 17cm long. Will this cause problems?...