Author Topic: Cable Shielding  (Read 2894 times)

Offline engelbma

Cable Shielding
« on: May 16, 2013, 06:49:19 AM »
I'm sure the experts know this ! Still I found it informative.

http://www.youtube.com/watch?v=6HZ1C_9o3gU
"No one cares how much you know until they know how much you care"

Offline palaughton

Re: Cable Shielding
« Reply #1 on: March 24, 2015, 01:13:23 PM »
Definitely going to try this.

Offline tangmonster

Re: Cable Shielding
« Reply #2 on: March 27, 2015, 10:49:44 AM »
a bit more reading on the subject:


http://en.wikipedia.org/wiki/Faraday_cage

A shield needs to be grounded though at least at one point.

Offline chipwelder

Re: Cable Shielding
« Reply #3 on: April 08, 2015, 08:56:23 AM »
Well that was an unconnected rca... I do suspect it would not be so very responsive if actually plugged into a source... not saying he speaks rubbish, just saying be real...
OK! I've had it! I don't give anymore Kharma. Kharma should work in mysterious ways...

Offline Ampdog

Re: Cable Shielding
« Reply #4 on: April 09, 2015, 04:24:46 AM »
He was demonstrating the principle, probably in such a way that the scope display would be easily visible. I tried to read the Y-axis setting but could not. A good demo would be to display a dual trace demonstrating the difference between an unshielded cable and a shielded model.
Audio must be the only branch of engineering where lack of basics' knowledge is considered a superior form of wisdom. (Anon)

Offline chipwelder

Re: Cable Shielding
« Reply #5 on: April 09, 2015, 09:58:44 AM »
Agreed, I just think of how susceptible my little twisted pair two strands of RG59 is when unplugged vs plugged in... I think that constitutes a failure mode though... if unplugged everything will swamp the signal...
OK! I've had it! I don't give anymore Kharma. Kharma should work in mysterious ways...

Offline chrisc

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Re: Cable Shielding
« Reply #6 on: April 09, 2015, 10:06:50 AM »
You cannot tell what the oscilloscope was reading.  Was it millivolts, microvolts or what?  With no termination, it is bound to pick up induced voltages
Even duct tape can’t fix stupid… but it can muffle the sound

Offline ID

Re: Cable Shielding
« Reply #7 on: September 27, 2017, 10:51:32 AM »
I'm sure the experts know this ! Still I found it informative.

http://www.youtube.com/watch?v=6HZ1C_9o3gU
Interesting

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