Amateur Extra › E9 Antennas and Transmission Lines › E9F06
E9F06
What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?
Pick an answer to check it.
Answer: C. 10.6 meters
Wavelength = 300 / 14.10 MHz = 21.28 m, so half is about 10.64 m. Air-insulated line has a velocity factor near 1, so the length is about 10.6 m.
Tip: Half wave in meters = 150 / MHz.