On Mon, Jan 20, 2025 at 08:50 AM, Lester Veenstra wrote:
... a case where the VSWR measures at 1:1 and the Smith chart is not on the zero reactance line.
A simple answer - for VSWR 1:1, X must be 0 and R must be 50. In any other case you will have "impedance mismatch", that will causes "reflection", and reflection "causes" VSWR
A bit longer explanation, by the very definition, for VSWR being 1:1 (no reflection), two impedances you are comparing MUST be identical resistance to resistance, reactance to reactance
If your "generator is Z1=R+jX, for VSWR to be 1:1 the load must be Z2=R+jX (R=R and X=X, if not obvious otherwise)
In the Smith chart we usually use, R=50 and X=0 (you can use any impedance instead, by 50 ohm center is what you will almost always see), so for VSWR 1:1 you can't have any reactance (X=0)
Do a google search for "complex impedance VSWR" for "formula" or use Owen's online calculator
