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Alexander, this is very common and is in fact normal behaviour for the type of SWR meter you are using. For these SWR meters, the relative forward and reflected power readings change if the transmission line impedance changes. Even though the static characteristic impedance of the transmission line is fixed at say 50 ohms, as soon as you start transmitting, ...


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Let us assume a 50Ω Source feeds a 2-port network #1, which is followed by a 2-port network #2, which is terminated into 50Ω. The (modified) input reflection coefficient $s’_{11}$ of the (output-mismatched) network #1 is $$s’_{11} = s_{11} + \frac{s_{21}s_{12}\Gamma_{L}}{1-s_{22}\Gamma_{L}}$$ with (complex) s-Parameters of network #1, and $\Gamma_{L}$ for ...


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