Feed lines and matching

Getting power to the antenna and keeping it there.

Coaxial cableConstruction, types and choosing a coax.Open-wire and ladder lineLow-loss balanced feed lines.Characteristic impedanceWhat Z0 means and why it must match.Feed line loss and velocity factorAttenuation by frequency and electrical length.SWR and reflectionsStanding waves, reflection coefficient and return loss.Antenna tunersWhat they match and what they don't fix.Baluns and ununsBalanced-unbalanced and impedance transformers.Common-mode chokesKeeping RF off the outside of the coax.Stubs, quarter-wave sections and the gamma matchMatching with pieces of transmission line.The Smith chartA map of impedance and reflection.RF connectorsPL-259, N, BNC, SMA and when to use each.