What is the highest resolution an Coax Cable supports?

Question

What is the highest resolution an Coax Cable supports? I've heard 480p but I wanted to be sure because I am looking at getting a capture card that uses Coax cable and wanted to know what the highest resolution would be I could record at.

I am planning to get this one
http://www.hauppauge.com/site/products/data_hvr950q.html

Answer 1

"Coax cable" can be a lot of things, but in this case you likely mean HDTV broadcast (ATSC) or over cable TV (QAM).



Both of these systems support up to 1080i.



From the FAQ on the page you linked:



> Using the WinTV 7 application the WinTV-HVR-950Q, will record in a transport

> stream (TS). For ATSC and Clear QAM digital TV recordings, the recording format

> and bit rate is exactly the same as the broadcast format (i.e. ATSC 1080i is

> recorded at 1080i). For NTSC analog cable TV recordings, our SoftPVR is used

> to create Transport Stream files (TS)



This does of course require that whatever you've tuned to is *sending* 1080i. If your broadcast station or cable channel is running at 720p, that's what you'll get. That is probably what is happening in avdaddy's case.

Answer 2

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Short answer: HD rated component cables can carry up to 1080p video and more, but component cables have been around built for standard def for years. These look the same but are not. (I am an Electrical Engineer and I have built HD compatible component cables. I have all the tools, crimpers, strippers to make Canare/Belden based HD rated component cables.) Now for some of the subtle issues: * Sony BluRay players are designed to output only 1080i on the component jacks. This is to thwart pirates. This has led the sony fan-boys to declare that component cables cannot carry 1080p. This is not true. This is a Sony business decision. * For many years component cables are available but built with coax to handle standard def frequencies. These will appear to work with HD video. It will not harm anything but there will be loss of fine-focus details, reds will not be solid red but 'bloom', colors that intersect may drift into each other, etc. Some facts: (Sorry I have to use numbers) 480i frequencies tops out about 4 Mhz 480p, 720i & 720p top out about 13 Mhz 1080p & 1080i top out at about 35 mhz Video engineers have a rule of thumb: All the cables, devices, connectors along the signal path need to be able to handle frequencies 3-4 times higher than the max frequency they expect it to handle. Standard def cables are made with coax with a bandwidth from 12-15 Mhz. HD cables are made with coax with a bandwidth from 90-120 Mhz. If you look at things like Yamaha receivers that offer HD component jacks - they are rated for 90 Mhz bandwidth. Belden 7787A coax (bundled red/green/blue) has a bandwidth of 124 Mhz to handle 1080 video. Canare V5CFB coax (the stuff I uses) has a bandwidth about 135 Mhz to handle 1080 video. The trick: read the description for component cables being rated for HD frequencies or having a bandwidth at about 90 Mhz or more. Hope this helps.

Answer 3

The maximum resolution that the WinTV-HVR-950Q can receive is 1080i.



What is it you want to "capture"? The 950Q is a TV tuner and not a "capture card", it has no ability to process raw video. All it does is receive the types of signals that TV stations & cable systems transmit.



Since an ordinary coax cable can transmit 100+ channels of 1080i signals, your question doesn't make much sense.

Answer 4

your link is for a USB television tuner card not a video capture card. the "coax" is an antenna lead. the tuner will record any program that is broadcast to the antenna input, either off-air or cable. Atsc and Qam are both MPEG2 encoded, so that is probably what the tuner records since it says MPEG2.



this is not the right device for recording video, it is for recording television programs, so your question is a little ambiguous. composite video in coax (usually with RCA connectors and not F) is standard resolution, 480 lines in the USA and Canada.



i use a very similar tuner card with my computer.

Answer 5

The device will deliver 720p. with simple RG6 coax connected to an antenna