On May 21, 2:37*am, "Szczepan Bialek" wrote:
In the space are free electrons (plasma). If you move one of them the next
reacts on it. It is normal pressure wave (electric wave).

If you are correct, the feedpoint impedance of a 1/2WL standing-wave
dipole should change from 75 ohms to around 600 ohms (traveling wave
antenna) when installed in free space. Does NASA know that resonant
standing-wave antennas, like 1/2WL dipoles, will not work in free
space because of all those free electrons in free space?
--
73, Cecil, w5dxp.com