Christman phasing calculator

Written by admin On November - 7 - 2009 1 Comment

 Christman Phasing Calculator
Operating frequency:

Mhz
Coax velocity factor:

Vf


Measuring your 71-degree phasing line

The 71-degree phasing line should be: 0.00 ft or 0.00 m.

The 71-degree phasing line is 90 degrees at 0.00 Mhz.

Cut the coax to the suggested length plus a few inches, in case your velocity factor is not quite right.

Leaving one end of the coax open, set your RF analyzer to 0.00 Mhz and trim the coax until you see minimum Z impedance. You now have a length of 71 degrees at your desired operating frequency.


Measuring your 84-degree feedlines

Each 84-degree feedline should be: 0.00 ft or 0.00 m.

The 84-degree feedlines are 90 degrees long at 0.00 Mhz.

Cut the coax to the suggested length plus a few inches, in case your velocity factor is not quite right.

Leaving one end of the coax open, set your RF analyzer to 0.00 Mhz and trim the coax until you see minimum Z impedance. You now have a length of 84 degrees at your desired operating frequency.

 


Go back to the 40M phased verticals article

 

Antennas

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One Response so far.

  1. admin says:

    If you can’t see the calculator, it is your web browser, not the page.

    The calculator might not be displayed in some older versions of Internet Explorer.

    Consider switching to a more compatible web browser such as Google Chrome or Firefox.

    Note: updated in January 2013 to fix an issue with Firefox browsers not correctly displaying the 71-degree information.

    Go back to the 40M phased verticals article