Cable Coax picture quality

I have a new Samsung 4k tv. I have a cable co. Dvr that will record 2 shows at a time that requires I go off box to watch another show. I have a Coax off a splitter to Coax input on the tv. Some channels are fine put many are not. The good channels are designated as an example 6-1 while the channel 6 is bad . Isn't this tv supposed to upscale any signal? Do I need some device to convert Coax to one of the other hdmi inputs for better quality on all channels?

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Clarification Request
This is a question for your cable provider support folks

Since you don't mention which provider you have, we don't really have the actual starting point per se, since all of them have slightly different systems/hardware requirements.

That said, yes- it is likely you need to rent an additional box in order to receive the full quality. Not something you can usually buy from a third party to solve the problem, at least not now with the switch to digital & HDMI gear. Ask them.

Keep in mind that there are online forums where actual individuals from the respective providers can assist with this type of thing. Take a peek at the various sub-forums @ FWIW, I have received fairly decent help there in the past when I was stuck.

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cable coax picture quality

Time Warner Cable is my provider. So apparently you can't just convert coax to hdmi with out some electronics even though the tv has the necessary hd/4k capability

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So this is a single HDTV/DVR setup w/ splitter?

Not sure why you would even need a splitter if the hardware was recent from TWC. Even my older (5-6+ yrs?) Moto xx16 series boxes from Comcast could record two shows simultaneously while I watched another on the main HDTV.

I guess you might want to provide more info here on the hardware specifics, and what content precisely you need to record/watch. This is a TWC issued DVR? Which make/model?

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Let's say channel 6 is SD and 6-1 is HD.

The reason TWC and others push SD channels today is simple. There are still millions of pre-HD sets out there.

SD ( ) is here ratty old 480i and a 4K (my bet is it's 4K UHD ) is 3840 pixels wide by 2160 pixels high which means no hope for ANY upscaler to fill in all those missing pixels. It's going to look ratty.

"The upscaling is as good as the source material," says Rob Manfredo of Sony, whose 4K TVs eliminate visual noise and fill in details using an image database. The process works wonderfully with 1080p Blu-ray and 1080i satellite video, he says, but not as well with lower-resolution material, such as 480p and 720p."

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