[NJARC] coax impedance

[Rob Flory]

Hi,
If you do the math on coax, keeping all other factors constant, 72(75?) ohms yields minimum loss and 50 ohms yields maximum power handling.  It has been long enough since my college course in electromagnetic theory that I can't remember the exact numbers, but it is a classic problem.

Few dipoles are run in free space, and many appear in yagi arrays or cut in half as a vertical, all conditions which lower the impedance.

Rob Flory