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Posted by Nate Nagel on January 12, 2007, 7:26 pm
I'd like to do a couple things at my house...
1) have at least one CATV "drop" in several locations - basement (for
the TV) 1st floor (for cable modem) and at least 2 bedrooms on 2nd floor.
2) possibly run CATV out to the garage (maybe 75' or so away) so I can
watch TV while working on car or hanging out upstairs.
I am ASSuming that I would want to add an amplified splitter at the
point where the cable enters my house, and then run individual runs of
coax to all the locations where I might want to hook up a TV or cable modem.
Problem is, I know nothing about this stuff. Can anyone recommend a
course of action?
thanks,
nate
--
replace "fly" with "com" to reply.
http://home.comcast.net/~njnagel
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Posted by professorpaul on January 12, 2007, 8:25 pm
If you have a cable modem, the amplifier must be bi-directional. These
are expensive. There is a fair chance that an ordinary splitter will
suffice. Your cable company usually provides one as part of the
installation, and checks the signal levels.
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Posted by Tony Hwang on January 12, 2007, 8:40 pm
professorpaul wrote:
> If you have a cable modem, the amplifier must be bi-directional. These
> are expensive. There is a fair chance that an ordinary splitter will
> suffice. Your cable company usually provides one as part of the
> installation, and checks the signal levels.
>
Hi,
Most cable signal is way stronger than it needs to be.
Most likely split signal will be just fine for you. If not
can install line amp excluding the one going to cable modem.
Quality coax, parts will give less signal loss/leak.
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Posted by DerbyDad03 on January 12, 2007, 10:35 pm
Could you explain the bi-directional amp comment?
I have a cable modem for Digital TV, Digital phone and Internet access.
When the cable company installed the modem they also installed what is
labeled as a "1-Way Tap". The main incoming cable is attached to the IN
port, the cable from the TAP port goes to the modem and the cable from
the OUT port goes to an pre-existing three way splitter. One of the
outputs from the 3-way goes to the digital cable box in the family
room, one goes directly to a TV and the other goes to the input of
another 3-way which has both TV's and more splitters attached to it.
The cable guy saw all the splitters and didn't seem to care. (It may be
that, in fact, he *didn't* care, if you know what I mean)
In all, I have 10 cable jacks in the house, 8 of which have devices
(cable boxes, TV's, VCR's or computers) attached to them at all times.
The 2 VCR's are always powered on (they are the tuners for 2 non-cable
ready TV's) as is the computer. It is not uncommon for as many as 5 (or
more) of the TV's to be on at the same time. I don't have any
amplifiers and I don't appear to experience any signal loss, although
some of the older TV's may be masking a poor quality signal by virtue
of their poor quality picture tubes. <g>
Anyway, I'm still interested in what you have to say about a
bi-directional amp.
professorpaul wrote:
> If you have a cable modem, the amplifier must be bi-directional. These
> are expensive. There is a fair chance that an ordinary splitter will
> suffice. Your cable company usually provides one as part of the
> installation, and checks the signal levels.
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Posted by Todd H. on January 13, 2007, 12:20 am
> Could you explain the bi-directional amp comment?
The amps aren't bi-directional really, it's just that they have a
passive return path so as to minimize their interference with the
upstream data transmission from the cable modem back to the head end.
THe cable modem has its own gain/amplifier for that path, and part of
it's "training up" in negotiation with the head end is setting that
gain. Without a passive return in an amp, the upstream channel is
pretty well doomed.
However, it is best to not have an amp in the cable modem's way at
all. The preferred method is to use a directional coupler (aka one
way tap) that has minimal insertion loss on the through leg, and 6dB
or so loss on the tap leg. The through leg goes to the cable modem
relatively unmolested, and the -6dB depleted tap leg gets run
that through an amplifier, to feed all bagillion outlets in the home
if needed.
In one case I had in a house the cable modem was on the 2nd floor far
from place the cable came into the house. IN that case, they had to
use 2 directional couplers, and even go to the higher quality, more
directional couplers they refer to as DC9's to get low enough return
path loss to get a usable upstream path. And because there were tv's
on both floors of the home, 2 separate amplifiers were used, but none
was in the path to/from the cable modem.
The trouble with amplifiers, even passive return ones is that they add
noise, and all you need is one class about information theory to know
why noise is detrimental to data transmission.
Best Regards,
--
Todd H.
http://www.toddh.net/
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