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I have 3 - 75 inch TVs throughout the house and I want to connect these to RF Coax so that I can select a channel to watch like channel 3 on one TV and channel 4 on the other two. The idea is each channel would be fed from a laptop to some type of hdmi to coax converter. These exist for a single channel but I haven’t seen a multiple channel encoder/converter yet.

Issue 1. How do I get multiple channels onto the coax? Issue 2. How do I control the laptop remotely without cross affecting the others?

Multiple HDMI to Coax Converter

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    Product recommendations are flat off-topic here, the rest isn't really Home Improvement either (though you obviously consider having multiple TVs all streaming to be an improvement over not having them). You may have better success at Video Production or Signal Processing, but be sure to read their help to ensure these questions are on-topic before asking. You may find some info at Software Recommendations on the laptop remote control software (again, double check what's on topic there before posting). Any particular problem with just running coax from each balun to the appropriate TV? You've got to run 3 cables anyway...
    – FreeMan
    Jan 29 '21 at 15:16
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    I think this is an XY problem. What are you actually hoping to do with this system? What you're asking isn't impossible, but it would be extremely expensive and there's almost certainly a better way. If you describe what goals you're trying to achieve, instead of asking how to make a particular thing work which may not be a good option, we can help you much better.
    – Nate S.
    Jan 29 '21 at 17:32
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Preface: this is going to be expensive and likely not valuable to anyone else, since it is non-standard.

First, I would do away with the Coax part of your idea. You're talking about encoding multiple channels of HD video onto a single coax line. Cable and satellite companies do this with expensive equipment with compression. HDMI has literally 20 pins, you can't just do this simply and electrically. HDMI over Cat5e has some compression and might be useful to you, especially with my next suggestion:

If you're not putting all the signal on one cable, how do you do it? Multiple cables. Modern TVs have ~3 HDMI inputs and switching between them is simple like changing channels. If you're talking about 3 different video signals and 3 TVs, you're looking at 9 cables crosslinked like this:

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Obviously, the more TVs and the more video source "channels" you have, the more complicated this will be. This also requires HDMI splitters and multiple cables run from your sources to your TVs. On the upside, you can run this with off-the-shelf hardware and full HDMI resolution.

Controlling your laptops could be as straightforward as a remote software on a tablet near each TV that you use instead of/in addition to a TV remote.

Having said all this, the proper and much cheaper way to do this is using the built-in "smart TV" software on each television, and if that's obsolete or not present (older televisions) to upgrade with a "streaming stick" device such as Chromecast, Fire TV, Apple TV, Roku, or other. For around $50 per TV, these will tune into any number of online streams and save you the cost of laptops, wire runs, adapters, et al. You can control the streaming of most of these from a smartphone or tablet (and the same smartphone/tablet can control whichever TV you happen to be at) making this solution superior in many ways to your proposal.

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