OT?: Connecting a OTA antenna with internet

"If you have a cable or satellite system, you might be able to use a splitter to add TV to another room. Most modern systems are designed to use a splitter in this way, but older systems make you run a separate line to each TV from a central switch. Make sure you know if you have a "splittable" system. "

How do older systems make one run a separate line to each TV? Why can't they use splitters and signal amps like I do?

Does it have to do with the remote control in each room?

Reply to
micky
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the web site correctly says that a diplexer can be used to combine signals onto one cable IF the signals are on different frequencies. This is true.

the web site also says CATV and off the air are different frequencies. THI S IS WRONG.!!!!! CATV and OTA shre the same frequeny ranges. If you tr y to use a diplexer to combine an off air antenna with the CATV system, the signals will interfere with each other because they share the same frequen cies.

you got good advice.... to run a new seperate cable from the CATV feed to y our cable modem and use the old house wiring for the antenna as you like. Just do not try to combine the two systems.

Mark

Reply to
makolber

Go ahead, you'll lose. Creating an ingress path that puts noise on Comcast's coax absolutely will get you booted.

Reply to
Jim

Not really. Can't you see channel 900 on cable? Is there channel 900 on OTA signal? Cable broad band spectrum has many different categories.

Reply to
Tony Hwang

Need diplexer today? LOL!

Reply to
Tony Hwang

The injected noise or signal should be stronger than cable signal strength. OTA signal coming down the coax is micro volt range.

Reply to
Tony Hwang

maybe tomorrow! or even numbered days.

Reply to
taxed and spent

This will not work. Cable internet uses the same frequency range as TV signals, they just grab an unused TV freq and use it for data. So, there is not a diplexer that will have one port tuned to the internet freq and another port tuned to all the rest of the TV freqs.

You are thinking of satellite TV diplexers, where the satellite TV freqs are above the OTA TV freqs.

Reply to
taxed and spent

20 or 30 years ago i found out my neighbor must of done something similiar to the OPs idea. before the internet ......

anyhow one day my neighbor put up a new antenna, and got cable too,

shortly after this i found i could watch cable from my one tv. i even mentioned it to him, he didnt appear to care.

the quality wasnt perfect, but it was certinally watchable. then one day it ended when the neighbor moved:(

i missed cable so much i had it installed......

Reply to
bob haller

als onto one cable IF the signals are on different frequencies. This is tr ue.

THIS IS WRONG.!!!!! CATV and OTA shre the same frequeny ranges. If yo u try to use a diplexer to combine an off air antenna with the CATV system, the signals will interfere with each other because they share the same fre quencies.

to your cable modem and use the old house wiring for the antenna as you lik e. Just do not try to combine the two systems.

Tony, channel numbers no longer have anything to do with the frequencies.

OTA uses 50 to about 700 MHz with gaps for other services.

Cable uses 50 to 800 or 900 MHz.

The channel numbers that you set on your box or TV no longer have a direct relationship to the frequency the channel is actually on.

This is especially true with digital cable channel, where there may be 12 o r more "channels" on one frequency.

Channel 900 on the cable system could be mapped to any frequency that the c able compnay feels like using.

Mark

Reply to
makolber

That's an important IF. You may need a filter. That seems to be getting a lot more complicated than running another cable.

Also, things like diplexers, splitters, etc... add signal loss, something you won't want with an antenna.

Channels 2-13 use the same frequencies for broadcast and cable (and digital doesn't change that). UHF broadcast is in the same frequency range as some of the higher cable channels (IIRC about 65 - 125).

BTW, Cable 22 is next to broadcast 7, a fact I found useful when getting cable on an old TV.

Reply to
Mark Lloyd
[snip]

There is no real channel 900. Most such actually use channels in the 100 to 135 range. Some of these are in the same frequency range as UHF from an antenna.

BTW, there's also the 95-99 (cable) range, which is just above 6 (in the band used for FM broadcast). IIRC, putting cable channels in frequency order, you get:

2-6, 95-99, 14-22, 7-13, 23-94, 100+

The last 2 ranges overlap UHF broadcast.

Reply to
Mark Lloyd
[snip]

Except Tuesdays, when the logic is reversed.

In months with an 'X' in then, your diplexer will explode (but not on Tuesday).

BTW, So you thought no months have X in them? You forgot about IX, X, XI, and XII with the bathroom lions.

Reply to
hah

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