Amateur Beam Antenna Calculator
Seven Element
Yagi
This calculator is designed to give the critical
information of a particular beam antenna, in this case a seven
element Yagi, for the frequency chosen. Enter the desired frequency
then click on Calculate and the optimum values for that combination
will be displayed in feet, inches and fractions of inches, and in
meters. To optimize the antenna for a frequency RANGE, do the
calculations twice, once for the low end of the range and once for
the high end; then average the two and plan to adjust the VSWR on
both ends of the range as needed. As general information, the
director is the shortest element, the driven elements are the middle
elements (in a 7 element beam, each the same size) and the reflector
is the longest element. Spacing is on the antenna bar holding the
elements, with equidistant spacing from each of the outside elements
to the driven element. Direction of the strongest transmitted signal
is from the reflector toward the director. Reception is the
reverse.
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