wrote:

Cecil Moore wrote:
Forward power is all the power incident upon the load. Reflected power is
all the power flowing away from the load. If the load is passive, the power
flowing away from the load cannot be greater than the power flowing toward
the load.

As you are fond of pointing out, there are only two directions on
a transmission line, so if a third term is needed to make the powers
balance, is this third term a forward power or a reflected power or
is it apportioned between forward and reflected in some unstated
way?

The third term certainly bears a resemblance to Dr. Best's interference
term where Ptot = P1 + P2 + 2*Sqrt(P1*P2)*cos(theta) Note that the
sign of the third term is determined by cos(theta)

The sign of the third term in Chipman's equation 7.34 indicates whether
it is forward or reverse power, '+' for forward and '-' for reverse.
Forward terms need to be collected and reverse terms need to be collected.

I'm going to play with that third term to see if it can be reduced.
--
73, Cecil http://www.qsl.net/w5dxp



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