TV Interference from cable modem.

TV Interference from cable modem.

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Subject Author Date
TV Interference from cable modem. Mark 05-26-2005
Posted by Mark on May 26, 2005, 8:06 am
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I know this has been hashed and re-hashed and I've read too much, now
I'm confused.

My setup is in a camper which has a living room, front bedroom and back
bedroom. Believe it or not, there are three tv's in the camper. Cable
recpetion is excellent on all TVs with the cable modem unplugged. I
have a splitter, brand new, but a cheapy with no specs on it, that
splits off of one of the tv connectors to the cable modem. The rest of
the wiring is inaccesable other than a cable jack in each room.

Cable modem works great for internet access when plugged in to cable
but my tv recption gets wrecked. I get noise on channels 2-7 and
channels 52-60 are virtually wiped out by snow and are unwatchable.

I'm thinking that I should split the wire where the cable comes into
the camper running one wire to the cable in jack that feeds the the tvs
with a 50mhz highpass filter and then another cable going to the cable
modem all by itself. Does this sound like a reasonable approach or are
there other things to consider ?

Any help would be appreciated.

Thanks,

Mark



Pure Networks
Posted by James Knott on May 26, 2005, 12:31 pm
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Mark wrote:

> I'm thinking that I should split the wire where the cable comes into
> the camper running one wire to the cable in jack that feeds the the tvs
> with a 50mhz highpass filter and then another cable going to the cable
> modem all by itself. Does this sound like a reasonable approach or are
> there other things to consider ?

If the modem is putting out interference on the TV channels, then the high
pass filter will not stop it. Further, if it's doing that, it's operating
out of spec. If it's owned by the cable company, get them to fix it. If
it's yours, you have to take it back to where you got it from. Further,
the interfering signal might be going over the shield of the coax, in which
case, a ferrite choke may fix the problem. If the TVs are simply sensitive
to the transmitted signal from the modem, the high pass filter might help,
though this situation indicates a sub standard TV.



Posted by Mark on May 26, 2005, 10:57 am
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They are cheapy TVs, 13" for $59 at best buy.



Posted by $Bill on May 26, 2005, 6:20 pm
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Mark wrote:

> I know this has been hashed and re-hashed and I've read too much, now
> I'm confused.
>
> My setup is in a camper which has a living room, front bedroom and back
> bedroom. Believe it or not, there are three tv's in the camper. Cable
> recpetion is excellent on all TVs with the cable modem unplugged. I
> have a splitter, brand new, but a cheapy with no specs on it, that
> splits off of one of the tv connectors to the cable modem. The rest of
> the wiring is inaccesable other than a cable jack in each room.
>
> Cable modem works great for internet access when plugged in to cable
> but my tv recption gets wrecked. I get noise on channels 2-7 and
> channels 52-60 are virtually wiped out by snow and are unwatchable.
>
> I'm thinking that I should split the wire where the cable comes into
> the camper running one wire to the cable in jack that feeds the the tvs
> with a 50mhz highpass filter and then another cable going to the cable
> modem all by itself. Does this sound like a reasonable approach or are
> there other things to consider ?

I would start with a ground block for the incoming cable and Quad-Shielded
RG6 cable thoughout.

Then a good 4-1 splitter (digital 4-way splitter (5-1000Mhz) with the
first tap going to the cable modem and the other three off to the TVs
(or a 1-2 with cable modem on first and then split the second again
for the TVs - that would give you less of a dB drop on the cable modem
side, but more on the TV side). If you still have problems once you
are hooked up right, then you could look at filters and such.



Posted by Mark on May 27, 2005, 8:36 am
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Thanks all for the advice. I'm going there this weekend and will try
out some of the suggestions and post back the results.

Mark



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