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Re-Cable House for HD?

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Old 09-29-2007, 02:03 PM   #1
A couch and an HDTV to go please.
 

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Default Re-Cable House for HD?

Folks, anyone have any thoughts on this...
My home was orginally wired abput 20 years ago with RG59 for cable-TV. When we got a digital STB a few years back, the cable co. split the line at head-in between a new 25' RG6 line to the STB and the old RG59 installation. Since we're going Hi-Def in rooms with the older outlets, I figure that its time to re-wire throughout.

I propose to upgrade the splitter at the head in with a new 2.3 MHz model, keep ing the "new" RG6 line to the STB, but split that about 12' in with a drop to a nearby BR. Then I'd replace the original RG59 line that runs about 75' "to the back" with RG6, and use a 4-way splitter to feed the rest of the house.

Or... do I need to pull the splitter at the head-in and run a single line for one 6-way split? Thoughts, anyone?

=T=
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Old 09-29-2007, 02:15 PM   #2
A couch and an HDTV to go please.
 

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Opps!
Sorry for the dup-post. :-(
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Old 09-29-2007, 02:56 PM   #3
High Definition is the definition of life.
 

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Quote:
Originally Posted by Talent312 View Post
I propose to upgrade the splitter at the head in with a new 2.3 MHz model, keep ing the "new" RG6 line to the STB,
Well, the max frequency that you will see from a single cable from any cable company will be 500mHz. So, if the 2.3gHz (not MHz) is free, use it; otherwise, any inexpensive 1.0gHz splitter will work fine.

Quote:
but split that about 12' in with a drop to a nearby BR. Then I'd replace the original RG59 line that runs about 75' "to the back" with RG6, and use a 4-way splitter to feed the rest of the house.
Consider this; the 75' of RG59 has a loss of about 6.0dB while 75' of RG6 has loss of about 5.0dB, so you only save 1.0 dB of signal level by upgrading. Also, when you get to the end of the line, and add the 4-way splitter, each output of the splitter will be down by 7.5 dB anyway. So, unless you really want to do this for "feel good" reasons, there is little reason to upgrade the RG59.

If the signal should just happen to be too far down comming out of the 4x splitter, upgrading to RG6 won't fix the problem, you will need to add an amp somewhere upstream, probably ahead of the first splitter.

Quote:
Or... do I need to pull the splitter at the head-in and run a single line for one 6-way split? Thoughts, anyone?
No, you're better of with the 2x splitter feeding into the 6x splitter. With the 6x splitter you end up with 4 ports that are 10.5dB down and 2 ports that are 7.5 dB down which is a worse situation.

Last edited by billinprinceto; 09-29-2007 at 02:59 PM.
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Old 09-29-2007, 04:21 PM   #4
A couch and an HDTV to go please.
 

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Quote:
... you're better off with the 2x splitter feeding into the 6x splitter With the 6x splitter you end up with 4 ports that are 10.5dB down and 2 ports that are 7.5 dB down which is a worse situation.
-------------------
As I understand it, you're saying:
1. I don't need to tinker with the cables... IOW, RG59 is ok for HD.
2. Having an initial 2x splitter with separate lines to a 2x splitter and a 4x splitter is not a problem either... and better than having a single 6x splitter?

... Which of course, is fine by me, as that means much less crawling around the attic.

But what if I were to ditch cable and go to satellite? Same answers?

Also, I thought I read that folks should upgrade to RG6 for cable-modems and HD for interference reasons. Is that totally out to lunch?
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Old 09-29-2007, 04:37 PM   #5
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Quote:
Originally Posted by Talent312 View Post
But what if I were to ditch cable and go to satellite? Same answers?

Also, I thought I read that folks should upgrade to RG6 for cable-modems and HD for interference reasons. Is that totally out to lunch?
There is a difference with satellite hookup vs cable because the receivers send DC power up to the dish LNB's and there you have DC voltage drop to contend with, so the answer will be different. RG59 is a bit light in that it adds some resistance to the curcuit over RG6. Short runs may still be ok though. Also if a powered multiswitch with a built in amplifier is located near the dish, the RG59 could be ok as well since the multiswitch would power the LNB. Installers will swear the RG59 won't work ever, because they will generally try to go the safe routes.

It is not totally out to lunch, but many times the RG59 can be made to work. Again, the installers tend to take the known "safe" routes. The problem is many customers will not want to pay for amplifiers or powered multiswitches vs the cost of new RG6 cables.
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Old 09-29-2007, 08:36 PM   #6
High Definition is the definition of life.
 

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Quote:
Originally Posted by Talent312 View Post
Quote:
... you're better off with the 2x splitter feeding into the 6x splitter With the 6x splitter you end up with 4 ports that are 10.5dB down and 2 ports that are 7.5 dB down which is a worse situation.
OOPS!!! Stupid typo. It should have been " . . . . you're better of with the 2x splitter feeding into the 4x splitter."
-------------------
Quote:
As I understand it, you're saying:
1. I don't need to tinker with the cables... IOW, RG59 is ok for HD.
2. Having an initial 2x splitter with separate lines to a 2x splitter and a 4x splitter is not a problem either... and better than having a single 6x splitter?

... Which of course, is fine by me, as that means much less crawling around the attic.
Let's revisit your options - perhaps I'm a bit confused. Are they:

2x < 4x vs. 6x only
or
might it be 2x < 2x < 4x vs 2x > 6x
or?
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Old 09-30-2007, 07:48 AM   #7
A couch and an HDTV to go please.
 

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That's what I thought you meant. :-)
To make sure that we're on the same page...

I have a grand-total of six (6) outlets to feed.
There's an intiial 2x splitter at the head-in.
[Cox Cable installed it for an outlet to a new STB .]
------------------------------------------------------
Option 1. -- Keep initial 2x splitter at head in.
(a) Split new RG6 line with a second 2x splitter;
(b) Split original RG59 line with a 4x splitter.

The (a) split would eliminate an old line that runs
back almost length-of-house back to an outlet
near the head-in.
------------------------------------------------------
Option 2. -- Remove the initial 2x splitter.
Use the original RG59 line to feed one 6x splitter.
This gives the digital-STB the same feed as all other
outlets.

The tech who installed the digital-STB line rejected
that idea... saying the STB needed a better signal,
or not wanting to go up in the attic?
----------------------------------------------------
If that helps.
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Old 09-30-2007, 09:35 AM   #8
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Ha, Ha, isn't this fun . . . .

Quote:
Originally Posted by Talent312 View Post
That's what I thought you meant. :-)
To make sure that we're on the same page...

I have a grand-total of six (6) outlets to feed.
There's an intiial 2x splitter at the head-in.
[Cox Cable installed it for an outlet to a new STB .]
OK, so far, so good . . . .

Quote:
Option 1. -- Keep initial 2x splitter at head in.
(a) Split new RG6 line with a second 2x splitter;
(b) Split original RG59 line with a 4x splitter.

The (a) split would eliminate an old line that runs
back almost length-of-house back to an outlet
near the head-in.
As I understand it, you want to feed two sets at the "front" of the house, and 4 sets at the "back" of the house. AND Let's not run anymore new coax than absolutely necessary - ok?

So, yes, this is the "best" option:
(relative to the main input cable, you will have)
2x splitter feeding
- RG6 to STB at front of house at 3.5dB down
- short (12') length of RG6 or RG59 (doesn't matter) feeding second 2x splitter

Second 2x splitter being fed a signal that is 3.5dB down, feeding
- coax to front bedroom with signal that is 7.0dB down
- RG59 (75') running to the back of house with signal that is 7.0dB down

4x splitter at "back" of house being fed a signal that is 7.0dB down, feeding
- 4 outputs that are each 14dB down from the main input signal

That should be pretty good.

If you have a decent signal comming into the house, 14dB down should be absolutely no problem. Most cable companies like to see at least a 20-30dB padding on the input signal anyway.

Note: Just to keep it neat, any unused ports from a splitter should always be "terminated" with a 75Ohm termination. This is just a funny looking "f" connector with a big bump on it . . . probably can get a Radio Shack for a few $$.

Also, make sure that any splitters that you buy are rated for 5-1000mHz.

Quote:
Option 2. -- Remove the initial 2x splitter.
Use the original RG59 line to feed one 6x splitter.
This gives the digital-STB the same feed as all other
outlets.

The tech who installed the digital-STB line rejected
that idea... saying the STB needed a better signal,
or not wanting to go up in the attic?
Actually replacing the initial 2x splitter with 6x splitter is not a bad idea, since it would give you 2 ports at 7.0dB down and 4 ports at 10dB down, which would be pretty good. HOWEVER, to do this, you would need to run three new coax lines to the back of the house, right . . . . . so not such a good idea after all.

Have fun
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