Re: Does three phase radio exist ?

Andrew,

You can produce and receive a "three phase" radio signal that is a linar combination of three plane waves of identical frequency, with their E fields and phases 120 degrees apart. The result of this would be a circular polarized radio signal.

Is this a useful thing? Sure. In fact, circular polarized radio signals are used by commercial and private radio operators to improve the range of their broadcasts, since they are less dependent on the receiving antenna's orientation.

However, you don't need three phases to produced a circular polarized radio signal. Two phases (90 degrees apart) are perfectly sufficient. here is good introduction written by a CB operator.

I hope this helps.