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OT: Coaxial Shielding - Copper vs. Alum


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#1 OFFLINE   chefwong

chefwong

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Posted 18 April 2011 - 05:09 PM

Was just looking up specs on CCTV wiring....
OT, but what are the pros/cons of copper shielding on single braided RG6 cabling over more common rg6qs aluminum braiding. If I recall correctly, sometime the extra shielding picks up noise...

CCTV require copper shielding. Anyone know the purpose/reasoning for this...

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#2 OFFLINE   bigglebowski

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Posted 18 April 2011 - 06:21 PM

Satellite and CATV signals are more tolerant when it comes to outside interference and their DCR return path so you can get away with aluminum and minimal shielding. At least this was more the case in the past since bandwidth use was a lot less. Like CATV systems having dozens of channels or like in early days of satellite you weren't stacking multiple satellites on to one wire. So shielding of 60% was cheap and commonly used and still is today.

CCTV needs that extra layer of tolerance to outside interference and demands a greater return path quality so copper shielding is used (and is also solid copper center conductor). Of course you could get away with using cheap aluminum based coax but usually in short runs that are not susceptible to a noisy environment. So think of video as more of a DC signal than RF. Like you will find most discussion on here regarding the center conductor in coax being solid copper is more about sending power to the LNB rather than giving you more signal quality.

Now that quad shield cable is more common today this would be more adequate to use especially if thats what you had laying around rather than ordering a spool of copper shield (also if its not CCS center conductor). Hell even RG59 is and still is very common in CCTV and you can get away with 250' pulls with it.




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