Dave Shrader wrote:
I don't have an IEEE dictionary so I stand corrected. However, 100 watts
into a Yagi, Quad, Log Periodic, or 4-square and 100 watts radiated is
still 0 dB gain.

Dave, that's true for the entire surface of a sphere at 100% efficiency
but you are still not using the IEEE Dictionary definition of antenna
gain. From Balanis: "... the power *gain* is usually taken in the direction
of maximum radiation." i.e. not over the entire sphere but over a small
area where the radiation intensity is at a maximum. The gain over isotropic
would then be based on the ratio of maximum radiation intensity per unit area
from the beam to the average radiation intensity per the same unit area from
an isotropic antenna. To obtain the (G)ain, one can calculate the (D)irectivity
and multiply by an efficiency term.

G(theta,phi) = e(cd)[D(theta,phi)]

where anything in parentheses is a subscript. e(cd) is an efficiency
term based on conduction and dielectric losses. If efficiency equals
100%, gain equals directivity. (theta,phi) are vertical and horizontal
angles related to a chosen area on the surface of a sphere.
--
73, Cecil, W5DXP



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