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  1. #1
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    video loop thrugh schematic

    Hi all
    Does any one have any information about loop through block of the input section in video distributer systems.
    Thanks in advance
    R110

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  2. #2
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    loop through circuit

    Loop-thru is generally just what the name suggests. The input connector is jumpered to a second connector to allow the signal to continue on to another device.

    There isn't much of a circuit there. The input connector either is directly soldered to a circuit board, or there is a short piece of coax connecting to the distribution amp circuitry.

    There is a second piece of coax, or a trace going to a second connector (the loop-thru connection). These internal jumpers are kept as short as possible. Sometimes they are terminated at the connector with a resistor that matches the characteristic impedance of the recommended cable.

    Loop-thru is almost always passive. In some high end equipment, there may be a 1:1 broadband amp for signal isolation. Seldom is there any stage with gain added to the loop-thru connection.



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