Topband: One way propagation

[Dan Zimmerman N3OX]

>But the medium where HF waves propagate
>is neither linear nor isotropic.

>Therefore, one way HF propagation IS possible,

Nonlinear isotropic media are a *necessary* but *not sufficient*
condition for nonreciprocal electromagnetic wave propagation.

I'm not saying it can't happen, but the nonlinearity and anisotropy of
the ionosphere does not guarantee that HF propagation is
nonreciprocal!