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Old 20th June 2013, 12:28 PM   #11
marce is offline marce  United Kingdom
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Don't get it sorry!!!
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Old 20th June 2013, 12:39 PM   #12
AndrewT is offline AndrewT  Scotland
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= joke.
If the number is twice as big then the performance must be twice as good !
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Old 20th June 2013, 01:59 PM   #13
marce is offline marce  United Kingdom
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Ahh yes. Too much time at work and not enough time to think.
I am still trying to get my head round what the original poster wants...
When I was a kid we couldn't afford even the 300Ohm stuff, just used a metal coat hanger, and here I am not joking, worked for years.
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Old 21st June 2013, 07:37 PM   #14
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Quote:
Originally Posted by marce View Post
Thinking about this further (the mention of S-VHS cable threw me) are we talking about:
Twisted pair within a shield or
two co-ax cables within a single shielded cable?
S-VHS used the latter, but the first can be used for balanced signals and digital LVDS
Ihave to explain better,perdone me and my bAD ENGLISH: I WANT USE ONLY THE "core-SOLID", ONE FOR GO AND ONE FOR RETURN.
tHE SHIELD IS ATTACHED ONLY ONE PART ON THE NEGATIVE POLE...
I HOPE TO BE MORE DECENT CLEAR NOW! :-)

BY
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Old 21st June 2013, 07:38 PM   #15
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Quote:
Originally Posted by inertial View Post
Ihave to explain better,perdone me and my bAD ENGLISH: I WANT USE ONLY THE "core-SOLID", ONE FOR GO AND ONE FOR RETURN.
tHE 2 SHIELDs ARE "ATTACHED- LINKED" ONLY ONE PART ,ON THE NEGATIVE POLE. ONLY...
I HOPE TO BE MORE DECENT CLEAR NOW! :-)

BY
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Old 21st June 2013, 08:03 PM   #16
DF96 is offline DF96  England
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No, its less clear now. You seem to want to use the inners of a 150 ohm coax for both signal and return, with the two shields grounded. If I understand correctly you want to make a 300ohm balanced circuit. If so, why not use 300ohm twin cable? Why not tell us what you want to do then we can advise you how best to do it.
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Old 21st June 2013, 09:33 PM   #17
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Maybe something like this, from Henry Ott.
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File Type: jpg Balanced_co-ax.jpg (117.7 KB, 94 views)
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Old 21st June 2013, 09:49 PM   #18
AKN is offline AKN  Sweden
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inertial,
Se this excellent video: Use a scope to measure the length and impedance of coax - YouTube
Watch what happens with the signal when impedance mismatch occurs.
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Old 21st June 2013, 09:51 PM   #19
DF96 is offline DF96  England
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Perhaps, but I hope the OP knows about baluns etc. as most audio digital links are 75 ohm.
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Old 22nd June 2013, 11:13 AM   #20
marce is offline marce  United Kingdom
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The Henry Ott picture from:
http://www.hottconsultants.com/pdf_files/aes-2007.pdf
refers to balanced audio, for digital signals this would not work, using a twisted pair within a shield would work, using one for the signal and one for the return, though you then have the problem of terminating the shield correctly, otherwise you are prone to RF pick up or emitting.
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