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New program CONNECT

Discussion in 'Electronic Design' started by Reg Edwards, Mar 3, 2006.

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  1. Reg Edwards

    Reg Edwards Guest

    There have been recent discussions about the interchangeability of
    coaxial plugs and sockets, their dimensions and their impedances. But,
    as usual, the magnitude of the electrical effects is never mentioned.
    Without numbers nobody knows what they are talking about.

    A coaxial connector is a very short length of transmission line but at
    UHF and microwave frequencies it is an appreciable fraction of a
    wavelength. When 1/4-wavelength long it has the property of
    transforming a mismatched termination to another value. When
    1/2-wavelength long the input impedance repeats the value of the
    termination. The SWR on an adjacent line is a function of the input
    impedance.

    What is the effect of using a 75-ohm coaxial connector in a 50-ohm
    system?

    What is the effect of using a length of transmission line of 50-ohms
    nominal impedance when it is actually 53 ohms?

    With mixed values of line Zo at what high frequency does the SWR and
    reflection loss become excessive?

    Program CONNECT.exe calculates the effect of inserting a length of
    line in a system of different Zo. Differences can be large or small.
    Line length can be physically very short.

    For a given frequency, mismatched Zo's and a velocity factor, input
    impedance, SWR, reflection coefficient and reflection loss are
    calculated. (Reflection loss is sometime known as mismatch loss).

    The program is worded in terms of a connector mismatch but has other
    applications.

    Input data can be varied in small increments from the keyboard while
    observing the effects on calculated values. Download CONNECT from
    website below. It has entertainment, educationaal and practical
    value. Amuse yourselves!
    ----
    ............................................................
    Regards from Reg, G4FGQ
    For Free Radio Design Software go to
    http://www.btinternet.com/~g4fgq.regp
    ............................................................
     
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