Splitting a coax signal

Splitting a coax signal
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Subject Author Date
Splitting a coax signal AndyLash 09-10-2006
Posted by on September 10, 2006, 11:24 am
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I would like to connect 4 tvs and one cable modem to the cable signal
coming into my home. The cable company split the signal just outside
my house and brought one run to my computer and one to my tv. I would
like to add three additional tvs and would like to know the best way to
add the others.
Will I need to boost the signal and if so what type of devise would be
the best to use.
Thank you for any suggestions.
Andy


Posted by Timothy Daniels on September 10, 2006, 1:59 pm
>I would like to connect 4 tvs and one cable modem to the cable signal
> coming into my home. The cable company split the signal just outside
> my house and brought one run to my computer and one to my tv. I would
> like to add three additional tvs and would like to know the best way to
> add the others.
> Will I need to boost the signal and if so what type of devise would be
> the best to use.


Leave the leg to the modem unsplit. Split the TV leg with a 4-way
splitter for the TV sets. The cable TV company should give you enough
signal strength to manage a 4-way TV split despite a split for Internet.
If you see a deterioration in signal quality, have the cable company
send out a technician to boost (or unpad) the signal at the pole, at the
entrance point, or in your house. If the tech boosts the signal at the
pole, you may be able to do a 2-way split in the modem run between
Internet and TV.

*TimDaniels*

Posted by Ed Nielsen on September 12, 2006, 10:10 am
Personally, I prefer to install a drop amp if there are more than 3
outlets. Typically, signal strength at the groundblock is 10-15dBmV.
Say it is 10. Lose 3.5 of that for the cable modem and you are left
with 6.5 to feed the TV outlets. A 4-way splitter drops that another
7dB, and you are at -0.5dBmV just leaving the splitter. Lose another
couple of dB through the cable, and you are at -2.5dBmV at the outlet
(depending on distance from splitter). If the level at the groundblock
is 15dBmV, you are then at +2.5dBmV at the same outlet, but I think it
is better to be above +5dBmV at the outlet. FCC says no less than 0dBmV
at the outlet. The splitter for the cable modem should be prior to any
amplifier. Cable modems should not be amplified.


CIAO!

Ed N.

Timothy Daniels wrote:
>> I would like to connect 4 tvs and one cable modem to the cable signal
>> coming into my home. The cable company split the signal just outside
>> my house and brought one run to my computer and one to my tv. I would
>> like to add three additional tvs and would like to know the best way to
>> add the others.
>> Will I need to boost the signal and if so what type of devise would be
>> the best to use.
>
>
> Leave the leg to the modem unsplit. Split the TV leg with a 4-way
> splitter for the TV sets. The cable TV company should give you enough
> signal strength to manage a 4-way TV split despite a split for Internet.
> If you see a deterioration in signal quality, have the cable company
> send out a technician to boost (or unpad) the signal at the pole, at the
> entrance point, or in your house. If the tech boosts the signal at the
> pole, you may be able to do a 2-way split in the modem run between
> Internet and TV.
>
> *TimDaniels*

Posted by $Bill on September 12, 2006, 10:22 am
Ed Nielsen wrote:

> Personally, I prefer to install a drop amp if there are more than 3
> outlets.

I've got a 1-4 splitter at the ground block with the modem on 1 and 3
TV lines on the others. One of the TV lines is split 1-8 farther down
(7 in use) with no problems.

> Typically, signal strength at the groundblock is 10-15dBmV.
> Say it is 10. Lose 3.5 of that for the cable modem and you are left
> with 6.5 to feed the TV outlets. A 4-way splitter drops that another
> 7dB, and you are at -0.5dBmV just leaving the splitter. Lose another
> couple of dB through the cable, and you are at -2.5dBmV at the outlet
> (depending on distance from splitter). If the level at the groundblock
> is 15dBmV, you are then at +2.5dBmV at the same outlet, but I think it
> is better to be above +5dBmV at the outlet. FCC says no less than 0dBmV
> at the outlet. The splitter for the cable modem should be prior to any
> amplifier. Cable modems should not be amplified.


Posted by Ed Nielsen on September 12, 2006, 11:21 am
With ~23dB of loss just through the splitters alone (not to mention the
attenuation through the cables from the splitters to the outlets), it
sounds like you sweet-talked someone into having your tap run out
extremely hot just to keep your furthest outlet within FCC specs (or
even acceptable). Cable modem has a rather high input level as well, I
would imagine (unless it has been padded down).


CIAO!

Ed N.

$Bill wrote:
> Ed Nielsen wrote:
>
>> Personally, I prefer to install a drop amp if there are more than 3
>> outlets.
>
> I've got a 1-4 splitter at the ground block with the modem on 1 and 3
> TV lines on the others. One of the TV lines is split 1-8 farther down
> (7 in use) with no problems.
>
>> Typically, signal strength at the groundblock is 10-15dBmV.
>> Say it is 10. Lose 3.5 of that for the cable modem and you are left
>> with 6.5 to feed the TV outlets. A 4-way splitter drops that another
>> 7dB, and you are at -0.5dBmV just leaving the splitter. Lose another
>> couple of dB through the cable, and you are at -2.5dBmV at the outlet
>> (depending on distance from splitter). If the level at the groundblock
>> is 15dBmV, you are then at +2.5dBmV at the same outlet, but I think it
>> is better to be above +5dBmV at the outlet. FCC says no less than 0dBmV
>> at the outlet. The splitter for the cable modem should be prior to any
>> amplifier. Cable modems should not be amplified.
>

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other useful resources:
The Federal Communications Commission (FCC)
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