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Guest Message by DevFuse

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Want to pre-wire for new installation, how many lines from dish?


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26 replies to this topic

#21 OFFLINE   slice1900

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Posted 07 February 2014 - 02:37 PM

This question gets asked often enough, it would make sense to have a sticky created and agreed upon by dbstalk installers/experts that people could be pointed to. If anything ever changes that sticky could be updated with the relevant information.

 

Seems a waste that every week or two there's a thread asking the same question, and multiple posters list various important factors like solid core RG6 being required by Directv, siamese cable with grounding wire needed to the grounding location, running a 5th coax if you ever anticipate subscribing to international packages, running one to an antenna location if you ever will have OTA, running one to the service entrance if you anticipate ever going back to CATV or using cable internet...

 

The big problem with pre-running wire is that where people think the dish might/should go isn't where the installer may want to put it, depending on factors like line of sight, ladder requirements, grounding requirements, and so forth. I wonder how often someone pre-runs wire, follows all the recommendations so the proper number/type of coax are run, but it can't be used due to a factor he didn't anticipate?


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#22 OFFLINE   WestDC

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Posted 07 February 2014 - 02:41 PM

Everyone is new once - A sticky would be nice however the "new" will ask a question as they will not always know what a stickie is :) and post annoying questions like whats a sticky?


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#23 OFFLINE   slice1900

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Posted 07 February 2014 - 03:08 PM

People new to the site would still start a thread, but they could be pointed to a link for that sticky thread, and if they had further questions they could still ask them, but at least it would take care of the basics.

 

Just an idea for the mods to consider.


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#24 OFFLINE   BobStokesbary

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Posted 07 February 2014 - 09:31 PM

People new to the site would still start a thread, but they could be pointed to a link for that sticky thread, and if they had further questions they could still ask them, but at least it would take care of the basics.

 

Just an idea for the mods to consider.

I think this is a great idea.



#25 OFFLINE   carl6

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Posted 07 February 2014 - 10:07 PM

Resistance is (the reason) less over solid copper core, but it will work less resistance the better for flow J Not Arguing .

 

 

resistance to what? Power? RF?


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RF tends to travel on the surface of a conductor, this is known as skin effect.  DC current flows through the conductor, which is why solid copper core is specified for runs that carry DC power (like from the PI to the LNB). Copper clad steel does have greater resistance to DC current flow than does solid copper of the same size/gauge.  Resistance to RF is a consideration in some situations, but typically not in the normal DirecTV installation.


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#26 OFFLINE   peds48

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Posted 08 February 2014 - 01:57 PM

RF tends to travel on the surface of a conductor, this is known as skin effect.  DC current flows through the conductor, which is why solid copper core is specified for runs that carry DC power (like from the PI to the LNB). Copper clad steel does have greater resistance to DC current flow than does solid copper of the same size/gauge.  Resistance to RF is a consideration in some situations, but typically not in the normal DirecTV installation.

and that was my point.


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#27 OFFLINE   carl6

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Posted 08 February 2014 - 11:30 PM

If you look at most hardline (heliax as opposed to coax), the center conductor is usually hollow. It's a copper tube as opposed to a solid copper or copper clad steel conductor.  Advantages are lower cost and less weight, and for rf and the skin effect, it doesn't impact performance at all.  Those installations rarely carry DC power though, just rf.






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