The feedpoint impedance DOES depend on the characteristic impedance!
Taking pure resistive cases (real characteristic impedances aren't), and lossless lines, a 75 ohm load at the end of a 75 ohm transmission line will have a feed point impedance that is a constant 75 ohms, whereas a 75 ohm load on 300 ohm feeder will have a feed point impedance that swings from 75 to 1200 ohms.
-- David Woolley Owner K2 06123 On 06/01/2019 21:40, Don Wilhelm wrote:
The feedpoint impedance to the transmission line can vary from quite low to quite high dependent on the frequency, the length of line, and the load at the far end. It does NOT depend on the characteristic impedance of the transmission line.
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