Can I split my RR coax to hook up TV tuner?

StanFL · Post by **StanFL** » Sun Oct 08, 2000 1:51 pm

I'm using RoadRunner. After the coax comes into the house it is split with one feed going to several rooms for cable tv and one specifically for RR going to my computer. I'd like to install a TV tuner card in my pc but if I use the cable tv coax feed I'll have to route a coax around a door frame and across the room. My RR coax feed is right behind the computer, would one splitter on it and a piece of coax going to the TV tuner degrade the RR signal?

Would I need any special type of splitter?

TIA

pelles · Post by **pelles** » Sun Oct 08, 2000 3:01 pm

I'm using it right now... just picked up a normal splitter from Circuit City (it's an RCA one, 900 mhz I believe), and it works just fine. I haven't noticed any RR signal degradation.

cablenut · Post by **cablenut** » Sun Oct 08, 2000 3:17 pm

your going to lose 3db making that connection not to mention the cable modem line should have a filter on it to filter out tv signals...

StanFL · Post by **StanFL** » Sun Oct 08, 2000 3:18 pm

Thanks all. I have a filter, I'll give it a try, I can always remove it if it causes trouble.

pelles · Post by **pelles** » Sun Oct 08, 2000 3:32 pm

This isn't DSL, I'm pretty sure that the cable lines don't have to have filters..

Prey521 · Post by **Prey521** » Sun Oct 08, 2000 3:35 pm

I have a Monster 2 Gigahertz two way Splitter with the Power Pass output, so I do not need a seperate filter. Its awesome and have never had any problems with it.

cablenut · Post by **cablenut** » Sun Oct 08, 2000 5:24 pm

"This isn't DSL, I'm pretty sure that the cable lines don't have to have filters..
"

Well the modem line to your cable modem has a filter on it (it is in the box outside your house) to filter out unwanted tv signals from the modem line at least that is the way @home is setup...

pmcartney · Post by **pmcartney** » Sun Oct 08, 2000 5:54 pm

Originally posted by cablenut:
"This isn't DSL, I'm pretty sure that the cable lines don't have to have filters..
"

Well the modem line to your cable modem has a filter on it (it is in the box outside your house) to filter out unwanted tv signals from the modem line at least that is the way @home is setup...

You do not need a filter to filter out the 534mhz downlink freq or the 28mhz 384kps uplink.

--Rich

cablenut · Post by **cablenut** » Sun Oct 08, 2000 8:20 pm

oh well **** those @home techs are just wasting money on those filters then! Oh btw here is the freq range of docsis modems..

88-860mhz (downlink freq)
5-42 MHz (upstream freq)

slick · Post by **slick** » Sun Oct 08, 2000 9:09 pm

just for youse guys info, filters (actually hi pass filters) are normally used to filter out the tv side of the house. what it does is blocks the return path (5-42 mhz)so interference from crappy wiring dosnt mess up the return back to the head end. however now that digital cable is coming and uses the return path these filters (unless they are notched for certain freqs) are going to have to come out. as for that two way splitter , it shouldnt bother unless your transmit level is so high already that it cant go up 4 more db in which case your modem will either loose sync right off or it will come and go on a regular basis.

cablenut · Post by **cablenut** » Sun Oct 08, 2000 10:58 pm

"just for youse guys info, filters (actually hi pass filters) are normally used to filter out the tv side of the house. what it does is blocks the return path (5-42 mhz)so interference from crappy wiring dosnt mess up the return back to the head end. however now that digital cable is coming and uses the return path these filters (unless they are notched for certain freqs) are going to have to come out. as for that two way splitter , it shouldnt bother unless your transmit level is so high already that it cant go up 4 more db in which case your modem will either loose sync right off or it will come and go on a regular basis."

I must have a notched filter then cause it's all digital where I am...

DaveM · Post by **DaveM** » Mon Oct 09, 2000 1:18 am

The only filters the AT&T guys installed at my house are on the lines to the TV's.
My Cable modem has a direct shot to the tap on the telephone pole.

In my office there is a three way tap.
Unfiltered goes to the cable modem and the two filtered lines go to the TV Tuners in the two computers. in that room.

AT&T techs told me, the filters were to remove the cable modem noise from interfering with television reception.

I don't have any channel filters (standard basic plan vs extended basic plan) so I guess those filters may do something, but they aren't causing any problems so they're going to stay there.

StanFL · Post by **StanFL** » Mon Oct 09, 2000 3:26 am

Well, so far so good. I didn't use any filter. No drop off in download speeds that I can tell. But damn it, this might be too convenient having TV on the ol' monitor

Hauppauge WinTV with DBX stereo and FM Stereo.

MtCableman · Post by **MtCableman** » Mon Oct 09, 2000 9:17 am

The filter usually says something like, "WHP 5-13". It filters the return frequencies, letting 5-13 MHZ pass for cable box returns and telephony. This filter is put in place on the TV lines to eliminate "ingress" in the return frequency range. It does not filter "TV" signals out, nor does it stop unwanted interference from the Modem.

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