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Old 08-15-09, 07:38 PM   #1
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TV Electronics cabling help

Alright, so I'm an electrical engineering student (senior no less) and I'm having a bit of a problem.

I've got two coaxial inputs to a digital TV (with tuner), one from the antenna (gets great signal), and one from the cable outlet (analog standard cable).

I want to run them both at the same time to the TV. I currently have a switch, but when I switch it, the TV gets confused and I have to re-scan for all the channels, which is annoying.

The antenna is almost all digital (5.1, 5.2, 11.1, 11.2, etc), and the cable is almost all analog. It seems to me there shouldn't be any overlap, so I tried using a splitter backwards and turning it into a splitter. Didn't work. When I just plug in one at a time, they work fine, but when I put in both inputs at once, they don't work.

If I get a real splitter, will it work? Or is it because there is some overlap even though I think there shouldn't be?

If just combing the signals won't work, can I convert the coax from one of them to another type? The antenna is HD, so I don't think I can convert to RCA without screwing up the signal. So if possible, I guess I would use the antenna straight in to the normal coax antenna input, and then convert the cable into something else. I have lots of inputs, I could convert to RCA, to HDMI, to component, to VGA, whatever. Is there anything that will do this?

As cheaply as possible would be nice.

Thanks for your help.
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Old 08-15-09, 09:18 PM   #2
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Use the RCA or any other output from the cable box (get a HD digital cable box from your company) and coax from the antenna then just switch video sources on the TV.
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Old 08-15-09, 09:19 PM   #3
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Not a cable box. That's the problem. It's straight from the wall cable. Old school, it's on campus. That's all we can get, no choice, otherwise I'd get some HD service from the cable company, that's what I do at my condo.
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Old 08-15-09, 09:21 PM   #4
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Get an A-B switch.
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Old 08-15-09, 09:25 PM   #5
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Did you even read my post? Jeez.

I said that when I use the A-B switch that I already have, the TV gets confused. I have to research for all the channels, so it ends up taking 10 minutes to switch between the cable and the antenna.
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Old 08-15-09, 09:31 PM   #6
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Use two TVs.
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Old 08-15-09, 09:31 PM   #7
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Yeah, I'll get right on that.

I was hoping for something a bit more elegant.
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Old 08-15-09, 09:39 PM   #8
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Look for an old VCR with RCA outputs and run the cable coax through that. You might even find a new one for under $50. It's probably the cheapest way to demodulate the signal.

Last edited by redirekib; 08-15-09 at 09:44 PM.
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Old 08-16-09, 07:49 PM   #9
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Good call red. It worked. Bought a VCR from craigslist for $10, hooked up to the cable, works like a champ. I can change channels with the VCR remote when I'm watching cable, then use the TV remote to change to over the air, and use that to change between air channels.

Good stuff.
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Old 08-16-09, 08:22 PM   #10
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Glad it worked out for ya

Now, if I could just help pcad with his cable issues...
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