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Thread: PrimeNet - Tapping to 75 ohm line

  1. #1
    muradt Guest

    Default PrimeNet - Tapping to 75 ohm line

    Hi,

    Is it possible tapping PrimeNet board to 75 ohm line (BNC) for digital logging? Or I should convert 75 ohm line to 120 ohm and then tap to 120 ohm lines?

    many thanks beforehand,
    Murad

  2. #2
    rboileau Guest

    Default PrimeNet - Tapping to 75 ohm line

    Hi Murad,

    The PIKA E1 lines are set to 120 ohm - RJ-48 Twisted Pair.

    You will need an external converter to tap 75-ohm lines.

    I have just googled with "75 ohm to 120 ohm converter" and several adapters are available on the market to buy.

    CONNECTOR A : 8 pin RJ-48C connector on the 120-ohm side
    CONNECTOR B : Dual BNC coaxial connectors (transmit and receive) on the 75-ohm side

    Best Regards,
    Rod

  3. #3
    muradt Guest

    Default

    Hi Rod,

    thanks for VERY quick response! ;-)

    Then connection scheme for audio logging should be like this:
    tap to 75 ohm customer e1 line -> make conversion to 120 ohm -> PrimeNet ??

    Is it right ??

    I ask you because of impedance of digital logging cards are 900 ohm.

    Murad

  4. #4
    rboileau Guest

    Default

    Hi Murad,

    My pleasure.

    That is correct.

    The PIKA E1 line is balanced at 120 Ohms. On the digital logging version of the PrimeNet MM DL board, there is a high impedance circuit so that the tap does not affect the monitored line.

    Rod

  5. #5
    muradt Guest

    Default

    Then I will test as follow: tap to 75 ohm line -> make conversion to 120 ohm -> connect to PrimeNet board.

    Many Thanks! ;-)

  6. #6
    muradt Guest

    Default

    Hi,

    I got it running with converter box (75 ohm <-> 120 ohm).

    thank you Rod ;-)

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