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which way is best?

Discussion in 'Electronic Repair' started by RB, Apr 6, 2006.

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  1. RB

    RB Guest

    Got an amplifier pc board with 75 ohm cable type F fitting to receiver with
    50 ohm bnc chassis fitting.

    I'm going put the 75 ohm type F on one end of my 10' coax interconnect, and
    a 50 ohm bnc on the other end of my 50 ohm coax.

    An alternative is to use 75 ohm coax, and mis-match the other way. This
    would put a 75 ohm type F fitting on a 75 ohm piece of coax, with a 75 ohm
    bnc hooking up to a 50 ohm bnc chassis fitting on the receiver.

    Which combination will give me the least loss?
  2. What?
  3. Michael Ware

    Michael Ware Guest

    What type of signal? Audio, video, RF? Are you transmitting, or receiving,
  4. bg

    bg Guest

    RB wrote in message ...
    A 75 ohm source driving a 50 ohm load wil be down
    -7.96 db.
    A 50 ohm source driving a 75 ohm load will be down
    -4.44 db
    Thats in voltage not power.
  5. bg

    bg Guest

    bg wrote in message ...
    then again if you are wondering which cable to use, 75 or 50 ohm - Match the
    cable to the load , not the source.
  6. RB

    RB Guest

    OK. General senility is nipping at my heels. Geezeritis is chasing me,

    Just took an in-depth look at the situation and find my receiver has 75ohm
    BNC input, so no problem. My bad.

    Thanks for the ideas and thoughts, though.

    One thing about getting old and senile is now I can hide my own Easter
  7. Guest

    I moved into a senior's building and by comparision, my memory is great! <g>
    Lee in Toronto

  8. And you never run out of new jokes! ;-)
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