Patchbay Grounding - Will this work?

Discussion in 'Pro Audio' started by Chris, Aug 21, 2003.

  1. Chris

    Chris Guest

    I've decided to finally shell out for the cable, dust off the bays
    that I've been too scared to touch, and solder some patchbays for
    myself. My biggest fear (as it is with most people from what I can
    tell) is the grounding scheme. The board is grounded, and the gear is
    grounded, so, if I can I'd like to avoid the whole tie bar, solder the
    rubber covered wick thing [name escapes me at the moment], where's my
    fuckin cold water pipe ordeal, if possible. From what I've drawn up,
    Ill need to first 48 points half normalled, and can live with
    everything else being non normalled. . so:

    For the half-normalled bay, would it be alright if I normal tip, ring,
    *and* ground?

    For the non-normalled bays, couldn't I just completely forget the tie
    bar altogether?

    If either of these wouldn't work, could anyone explain why? Thanks

    Chris, Aug 21, 2003
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  2. You cannot half-normal the ground because that is not usually a switched
    contact. You can permanently connect it, but then it is going two or three
    ways when you use patch cords.

    There are two ways of grounding a setup: either the patchbay is the central
    ground reference or the console is. If you are using a console that has all
    the inputs and outputs grounded together then the choice has been made
    already for you.
    I would forget common ties altogether. Just connect screened pairs to each
    jack and all the way back to the equipment, even if not balanced. Do not
    disconnect shields in the connectors and if unbalanced connect cold and
    screen together. Do the normalling with short (hand) twisted pairs on hot
    and cold only. Then see if you have any problems, the most likely cause
    would be an unbalanced input on your monitor amplifier and that should be
    fixed by replacing it with a balanced one or fitting a transformer.
    Graham Hinton, Aug 21, 2003
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