Richard Clark wrote:
Coherence (cross-correlating) is a statistical term for comparing
(0.00 to 1.00) complex waves. You can have temporal coherence,
spacial coherence, spectral coherence and on and on; none of which are
actually named here, but whose various definitions have been
notoriously cross-connected into a hodge-podge argument of no
particular merit.

Fortunately, we amateur radio operators are not concerned
with anything that complex. We are concerned with
essentially single frequency, phase-locked signals in a
single-source, single transmission line, single-load
configuration. Many levels and dimensions of complexity
simply are negligible concerns within the amateur radio
environment. Introducing irrelevant issues is just a
diversion away from ideal examples which are relatively
easy to understand. Isn't it better to clear the waters
rather than muddy them?
--
73, Cecil http://www.w5dxp.com