http://vk5ajl.com/projects/SWRMeter.php
knowing the principals full well from my days in a radio job, so I had a go.
work you know but with one error swap names of FWR and REV meeasure port.
to this:
With matched terminations on the output ports,
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1. A portion of the wave traveling from port 1 (input) to port 4 (output) is
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coupled to port 3 (forward coupled), but not to port 2.
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2. A portion of the reflected wave traveling from port 4 to port 1 is coupled
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to port 2, but not port 3.
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3. A portion of the wave incident on port 2 to port 3 is coupled to port 4, but
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not port 1; and a portion of the wave incident on port 3 is coupled to port 1, but not
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port 4.
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The reflected voltage is r times the incident voltage. Since power is proportional to the square of the voltage, the reflected power, Prefl is (5/7)2 x 4 W = 2.04 W
and the power to the antenna = 4 W - Prefl = 1.96 W
when I work out how to add gerber plot files I will
and a picture of my work.
