interconnect, coax cable, and RCA cables...

Discussion in 'Archived Threads 2001-2004' started by Yoon Lee, Jun 30, 2002.

  1. Yoon Lee

    Yoon Lee Stunt Coordinator

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    So, there are interconnects and coax cables. Are they interchangible? I mean can I use a interconnect for a cable for digital output on a CD player, for example? Or, subwoofer cable? Are they just marketing scheme to sell more cables that we don't need?
     
  2. Phil A

    Phil A Producer

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    Not all interconnects are coaxial in design. Some coaxial designs might be better for digital or video or vice versa. Digital specs call for 75 ohm impedence. You may get sound with anything you use, but at a minimum with a digital coax output I would at least use a 75 ohm cable. Some things are marketing hypes and some are not. Don't overdo the cost level of cabling in proportion to the equipment you have. It would be silly to put a $175 digital cable on a $100 DVD player vs. getting a $250 player and a $25 cable.
     
  3. Yoon Lee

    Yoon Lee Stunt Coordinator

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    So, it's not a good idea to use an interconnect as coax cable?
     
  4. Phil A

    Phil A Producer

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    It is not likely to cause a problem, but may not produce the best results. Audio cables could be 75 ohm impedence but they often are 50 ohms or perhaps as much as 200 depending on the design. If you are just looking at the cheapest solution for something to use for digital that will be half decent Radio Shack has a 3 ft. cable, catalog 42-2679 that is $10.99 and a 6 ft. cable, catalog 42-2680 is $14.99. They also have a 12 ft. one. For analog connectors, yhey also have audio cables for $8.99 for a 3ft. pair, catalog 42-2605. They also have video cables such as the 3 ft. catalog 15-1518 that are $4.99, catalog 15-1519 is 6 ft. and $5.99 and they have a 12 ft. one too. Places like http://www.milestek.com/ also have reasonably priced solutions.
     
  5. Bob McElfresh

    Bob McElfresh Producer

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    Most interconnects ARE COAXIAL.

    If you cut one, it would look just like your CATV coax.

    Here are the rules:

    - Video cables must be made with 75 ohm coax.
    - Coaxial Digital cables must be made with 75 ohm coax
    - DSS/CATV coax is 75 ohm coax

    Audio & subwoofer cables can be made with any of the common 50/75/110 or 300 ohm coax. It's not standardized. This means some audio cables ARE 75 ohm and can be used for video, but it's a gamble.

    When we get into Video, we have to worry about frequencies up to 4 Mhz for video, 7 Mhz for Progressive Video, and 35 Mhz for HD video.

    Generic video cables WILL work for all of these, but could be doing some subtile damage/slant to the signal for the higher frequencies.

    The RCA plug on the end becomes a factor at video frequencies as well.

    Hope this helps.
     

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