I have always understood "Isotropic" to be a hypothetical point source of no dimensions but capable of radiating the power fed to it as a sperical field with the source at its centre. 73 de Pat G4GVW
Thanks but.......it seems like a contradiction in terms. Effective relates to a _particular_ direction. Isotropic is all directions and so _not_ in any particular_ direction. There cannot be I and E