Background: precalc and trig, but not calculus. I am reviewing precalculus and trig. at this time; some understanding of complex numbers. But a little trouble with complex numbers expressed as e^(2 pi f t); I have a partial understanding of IQ modulation from reading some articles, but I don't understand about negative frequency or how to represent rf signals using vectors- especially why some vectors move clockwise and others move counter-clockwise. (Basically a piece meal understanding of the subject).

Thank you, Richard Phillips