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New program. COAX_VLF

Discussion in 'Electronic Design' started by Reg Edwards, Apr 13, 2006.

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  1. Reg Edwards

    Reg Edwards Guest

    Now available: Program COAX_VLF

    The behaviour of transmission lines at the lower frequencies is more
    complex than it is at HF and above. The effects set in sooner at
    higher frequencies on low impedance coaxial transmission lines. They
    are affected more at higher frequencies than other types of line.

    As frequency is reduced below several hundred KHz the impedance Zo
    increases, its impedance angle becomes more negative, and the
    propagation velocity decreases. Unusual things happen such as
    reflection coefficients being greater than unity and the SWR being
    greater at the input end of a line than it is at the load end.

    At power and audio frequencies Zo can be an order of magnitude greater
    than the nominal HF value, and the angle of Zo aproaches -45 degrees.

    It is useful to be aware of the magnitude of such effects. With coax
    they can be experienced in small ways at frequencies as high as 2 MHz
    or more.

    Download program COAX_VLF in a few seconds from website below and run
    immediately. Filesize = 48 Kilo-bytes. It is both practical and
    educational. Try to fathom out how reflection coefficients greater
    than unity can arise.
    ----
    ............................................................
    Regards from Reg, G4FGQ
    For Free Radio Design Software go to
    http://www.btinternet.com/~g4fgq.regp
    ............................................................
     
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