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Combining OTA antenna & Cable TV on one coax

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Old 09-04-2006, 08:31 PM   #1
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Default Combining OTA antenna & Cable TV on one coax

Here's what I am trying to do.

I want to put an LCD flat panel High Def TV in my bedroom. I have one run of coax from my media center downstairs. I want to combine my OTA antenna and local cable feed onto the one run of coax to receive local HD programming via the OTA antenna and still have all my non-scrambled cable channels available. Is this possible? I am pretty sure it can be done with DirecTV or DISH, not sure about Cable though because of the potential interference.

If this isn't an option then would the next best option be to buy an LCD with a Cable Card slot to receive most (not FOX) of my local HD? Or would this not work because my HD stations are in the 700s and TVs don't have that range of channels?


Thanks for your help!

P.S. I think the cable card will be fine to receive the HD programming. Just checking on combing OTA and Cable TV on one coax.

Thanks
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Old 09-04-2006, 08:34 PM   #2
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Cable and OTA do not mix well because they use the same frequencies for many channels, often moving a channel to another frequency and placing another channel there. You can get two different channels on the same frequency.
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Old 02-02-2007, 12:36 AM   #3
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i know this is a old thread, but just wondering if there are any new products that can allow for this to work.

MY plasma has only one input for coax so its a bit of a problem for me.
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Old 02-02-2007, 01:23 AM   #4
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IF the signal is strong enough you could use an indoor antenna connected to the RF input for locals and a cable converter connected to an HDMI, DVI or component input for the cable based content.

For SD content you could have a VCR in a room with better coax access and use one of those wireless repeater sets to get the signals to a composite input. I haven't seen a HD version of those yet though.

Keep you eye out for products that MIGHT be coming out to link SOME editions of Windows to devices like Xbox 360 through a wireless home network. Full capability might require a computer and/or a console equipped to do that AT THE TIME OF PURCHASE though.
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Old 02-02-2007, 06:19 AM   #5
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To answer the original question...ota and cable can not be combined onto 1 coax because the channels overlap and would interfere with each other.

the only way this is possible is to trap a portion of the cable spectrum with a band stop filter then combine. but you loose several cable channels in the process.

input the off air coax to the set for off air HD and input the cable to your cable box and input that to one of the video inputs...dvi, hdmi, component. and switch between the inputs and your tuner.

Last edited by Rick0725; 02-02-2007 at 06:23 AM.
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Old 02-02-2007, 08:27 AM   #6
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To paraphrase what Rick said: it's more trouble than it's worth...run a new cable...LOL...you an always use a external RF switch if you need to...

http://www.radioshack.com/search/ind...%20switch&sr=1
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Old 02-02-2007, 10:41 AM   #7
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Quote:
Originally Posted by tigerbangs
To paraphrase what Rick said: it's more trouble than it's worth...run a new cable...LOL...you an always use a external RF switch if you need to...

http://www.radioshack.com/search/ind...%20switch&sr=1
See my antenna has a switch built in.

But since my tv only has one rf input. I have to reprogram everytime i switch.

Another member suggested getting a dvd recorder and rf into that and component out.


sorry for getting 2 threads going on this guys
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Old 02-02-2007, 10:45 AM   #8
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no sweat: I do understand your frustration, but I guess my question to you know is : are you using a cable TV HD box? If you do, it's a pretty simple matter to switch because the HD box would come in through yur HDMI or component connection to your TV set, and the OTA would then come in via your antenna input: or am I still not understanding your problem?
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Old 02-02-2007, 10:57 AM   #9
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no sir no box at all.

Straight from the wall cable is all it is. And a antenna i purchased so i can get my locals in hd.

But the darn tv only has one rf input.
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Old 02-02-2007, 11:19 AM   #10
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Quote:
Originally Posted by ArinX
no sir no box at all.

Straight from the wall cable is all it is. And a antenna i purchased so i can get my locals in hd.

But the darn tv only has one rf input.
Well then get a box. Problem solved.

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Old 02-02-2007, 11:21 AM   #11
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You know, it might actually be easier to get an HDTV cable box: deadhead68 has a point.
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Old 02-15-2007, 01:01 PM   #12
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Quote:
Originally Posted by jim5506
Cable and OTA do not mix well because they use the same frequencies for many channels, often moving a channel to another frequency and placing another channel there. You can get two different channels on the same frequency.
If you are going to attempt to mix cable and OTA, what device would you recommend? I know that a diplexor for satellite doesn't work as I tried that. I am going to try a cable splitter going in both directions, but wanted to get opinions. I mainly just want the HD channels from OTA. When they come into a TV, they are remapped from their original station. I have the real UHF channel number for the stations that I want and don't care if those stations override the stations that I am getting on cable (assuming that cable stations are occuppying that same frequency).

So any advice on a diplexor or solution that would accomodate this, knowing the potential problems would be great.

thx

- kevin
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Old 02-15-2007, 02:12 PM   #13
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There is the possibility that some Jointennas by Channel Master could work. Basically they are used to combine multiple antennas for OTA applications where one station is in a different direction than the majority of the stations. Basically it is a device that filters out the secondary frequency from the main antenna and combines the secondary antenna at that frequency. In theory it could work for what you want to do. How many you would need is going to depend on what the exact frequencies are that you need to receive.

Problems that I would envision are the losses through the Jointennas. Perhaps some preamps could remedy that.

Then there is the possible need for 2 way communications should there be a STB cable box involved. I'm not sure if the Jointennas will allow for the 2 way communication required. If you are not using a cable box this may not be an issue.

Finally, selecting the Jointennas could be tricky because they have basically a center channel and will affect channels on either side of it. Since the cable channels are spaced closer together than OTA channels, each Jointenna could affect several, maybe as many as 8, cable channels.

There are really not any devices that can do what you want to do on a channel by channel basis.

There are many posts about Jointennas and a search of this forum will provide you with a full night's reading.

Good luck.
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Old 02-15-2007, 09:14 PM   #14
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I had a similar problem recently when trying to add OTA to a single coax that carried only Sat channels from a Dish 322 via TV2 set up on Ch50.Rather than use a simple splitter and mix the signals(we have a semi-local DT on 50), I used the composite output on the 322 and fed that into a Radio Shack modulator set to Ch3,then fed that into the low side(2-6) of an HLSJ combiner.Fed the OTA into the high side(7-69).Works like a champ.The 322 has an RF remote which makes changing Sat channels a snap.

I would think if one had a cable box,or a VCR that would output a composite signal and be remotely controlled,the end result would be the same as what I did with the Sat channels.I don't have cable so I can't experiment.And,of course,if one has Lowband DT signals this obviously wouldn't work...ie WBBM Chicago,etc.
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Old 10-19-2008, 06:36 AM   #15
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Quote:
Originally Posted by sawillems View Post
Here's what I am trying to do.

I want to put an LCD flat panel High Def TV in my bedroom. I have one run of coax from my media center downstairs. I want to combine my OTA antenna and local cable feed onto the one run of coax to receive local HD programming via the OTA antenna and still have all my non-scrambled cable channels available. Is this possible? I am pretty sure it can be done with DirecTV or DISH, not sure about Cable though because of the potential interference.

If this isn't an option then would the next best option be to buy an LCD with a Cable Card slot to receive most (not FOX) of my local HD? Or would this not work because my HD stations are in the 700s and TVs don't have that range of channels?

Thanks
I was in the exact same predicament. I had a beautiful Samsung flat screen wall mounted in the bed room. It only has one RF input. At first I hooked an A/B switch to be able to provide antenna and cable signals. But that was a pain in the ass because everytime I wanted to change from digital OTA signals to Cable I had to get up and flip the switch. Then access a few menu choices on the remote to tell the tv that I was changing the type of signal. My friend said why don't you just use a cable splitter to combine the signals. I immediately told him that couldn't work because you would be combining signals and that would cause an overlap that would make a mess.Well I eventually bought an inexpensive cable spitter from the dollar store and tried it and was amazed that it worked. I had the TV scan cable and antenna channels and it tunes from both lines. All you have to do is use the menu to select what type of signal you want the tuner to tune(Air or Cable) via the onscreen menu. I repeat what you want to do worked for me despite what I thought.

Last edited by LFarinola; 10-19-2008 at 06:43 AM.
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