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Impedance Matching

Discussion in 'Electronic Design' started by Mehdi Fatemi, Jun 9, 2004.

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  1. Mehdi Fatemi

    Mehdi Fatemi Guest

    Hi,
    How can I match 120 ohm impedance to 75 ohm impedance by passive circute?

    Thanks
    Mehdi
     
  2. Wideband obviously.
    With a T or Pi Resistor network or perhaps with a transformer
    if DC is not included.

    Rene
     
  3. Leon Heller

    Leon Heller Guest

    A suitable transformer.

    Leon
     
  4. Tam/WB2TT

    Tam/WB2TT Guest

    If it is single frequency, low power, a 1/4 wave section of RG62.

    Tam
     
  5. John Fields

    John Fields Guest

     
  6. Activ8

    Activ8 Guest

    How do you organize your links and responses (someone else, or maybe
    you, just recently repeated a response from not long ago) so you can
    find them quickly and not have to type the same stuff 5 or so ( ;) )
    times a month?
     
  7. Joerg

    Joerg Guest

    If you can tolerate the little loss, maybe a 45 ohm resistor in series
    would do? This makes the 75 ohm side look like 120 ohm. I know this
    sounds crude but it can work.


    Regards, Joerg
     
  8. That makes the 75 ohm look like 120, but doesn't make the 120 look
    like 75. You can make that series resistor 73.5 ohms and parallel the
    75 ohm side with 122.5 (or there abouts) and both sides will match.
     
  9. John Fields

    John Fields Guest

    ---
    Usually it only takes a few minutes to find/refind a link and type a
    response to a question, so I don't have anything really "organized",
    per se, except for a stash of non-ASCII schematics which I've come up
    with over the years for this and the other electronics newsgroups.
    _BUT_ I'm working on getting my web site updated and when I'm done
    there'll be an area where schematics will live (like on Jim Thompson's
    site) and an area with good links and maybe a FAQ-like area with text
    and graphic explanations for some of the commonly asked questions
    which come up time and time again.
     
  10. Doug Goncz

    Doug Goncz Guest

    That makes the 75 ohm look like 120, but doesn't make the 120 look
    Thank you, Professor Popelish! I just learned something and it stuck!


    Yours,

    Doug Goncz ( ftp://users.aol.com/DGoncz/ )

    Read about my physics project at NVCC:
    http://groups.google.com/groups?q=dgoncz&scoring=d plus
    "bicycle", "fluorescent", "inverter", "flywheel", "ultracapacitor", etc.
    in the search box
     
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