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G9 · Antennas and Feed Lines

General · correct answers only, in question-pool order.

G9A01

What determines the characteristic impedance of a parallel-conductor feed line?

AnswerThe spacing between conductor centers and the conductor radius.

Transmission-line impedance is set by conductor geometry and dielectric properties rather than by line length.

G9A02

AnswerHigh SWR increases the loss.

Reflections raise current and voltage at points along the line, so an already-lossy line dissipates more power.