Jimmie D wrote:
Isnt it true the Cos of the phase term will always be equal to -1 or plus
1, -1 for any value of SWR except 1:1 and 1 for a 1:1 SWR value.

The context of the present discussion is a Z0-match point
at which reflections toward the source are eliminated.
For the case of a Z0-match, the cosine of the phase term
will indeed always be +1 or -1 as the fields are either
in phase or 180 degrees out of phase.

If the SWR is 1:1, there is no reflected voltage and
therefore a2 = 0 and there is no assignable phase angle
between the voltages.

In the general case, where reflections are allowed to
reach the source, the cosine value can be anything
between +1 and -1 as the angle between a1 and a2 can
have any value between zero degrees and 360 degrees.
--
73, Cecil http://www.w5dxp.com