MPX Cable

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  • February 6, 2009 at 9:14 am #236
    LuK
    Participant

    Hi Leif,

    I will have to realize an mpx cable and I would want to know if I will have to connect the Left or Right of the audio card output (or both)?

    Thx, bye. 🙂

    February 6, 2009 at 2:42 pm #6565
    Leif
    Keymaster

    Hi Luk!

    Use either left or right — not both.

    ///Leif

    February 20, 2009 at 1:05 pm #6566
    LuK
    Participant

    Hi Leif,

    how much can be long the mpx cable? 15 meters are too much?

    Thanks, bye.

    February 20, 2009 at 7:22 pm #6567
    Sparky
    Member
    quote :

    how much can be long the mpx cable? 15 meters are too much?

    This would depend upon the output drive capability of the sound card, termination impedance at the transmitter input, and the quality of the cable used. All shielded cables exhibit distributed capacitance along its entire length that acts like a low pass filter (high frequency roll off or tilt). For 15m length you will want to use a cable with the lowest capacitance per unit length. In addition you will have to measure MPX tilt again at the transmitter and adjust BBP for a flat response. By doing so will compensate for the induced tilt from the cable capacitance.

    February 21, 2009 at 1:37 am #6568
    Leif
    Keymaster

    Sparky is 100% correct, as always.

    Thank you — saved me the typing 😉.

    Best,
    ///Leif

    February 25, 2009 at 6:37 pm #6569
    LuK
    Participant

    Thx Sparky & Leif,

    some suggestion on the type of cable to use? RG58?

    Bye. 🙂

    February 26, 2009 at 12:13 am #6570
    Leif
    Keymaster

    If I had to make a really really long cable run, I’d probably spring for Belden 1694A. (That’s Belden = The real thing, not Belkin = the overpriced consumer garbage). Belden 1694A is technically RG6, but a particularly good, low-loss kind. I used it to make a 60 meter (3×60) component run, 720p, for my outdoor HDTV home theater. That was a fun project 😉.

    This is an actual photo of the screen! Image is composed from two exposures — one without flash (for the screen photo) and one with flash (for everything else).

    For short cable runs (a couple of meters), I’ve successfully used whatever cheap RCA cable was laying around. The longer your cable, the more important the quality of the cable, but for a couple of meters I personally wouldn’t worry.

    ///Leif

    February 26, 2009 at 9:54 am #6571
    Anonymous
    Guest

    Leif,

    That must keep the neighbours amused as well. 🙂

    Scott

    February 27, 2009 at 1:32 am #6572
    Leif
    Keymaster

    It did!

    5.1 surround sound, breakaway processed.. It sounded incredible 😉.

    Unfortunately I dismantled the whole system before I left the United States. (This was in Lancaster, Pennsylvania.)

    I gave away the screen, and sold all the other parts.

    When I have a house with a yard in Thailand I might just do it all over again though!

    ///Leif

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