X1 = de1 + 2.375 x at first phasing-line bend, rear line Y2 = r * (1 - 2.875 / h) y at second bend ![]() Y1 = r * (1 - 2.375 / h) y at first phasing-line bend R = 3 / 2 half of rivet spacing (insulated elements) F/R is the ratio of forward power to that of the worst backlobe in the rear half-plane.įrequency Impedance SWR Mismatch Conductor Forward F/R Forward gain includes mismatch and conductor losses. The red dot is the feedpoint.Ĭalculated performance is for 28 analysis segments per conductor halfwave with additional segments for the phasing lines. I jumpered a wire across the feedpoint terminals and placed a source at its center. This shows segmentation detail for the phasing lines and feedpoint. ![]() I modeled the antenna with the AO 9.67 Antenna Optimizer program. The Antennacraft FM13 is a log-Yagi array with 13 elements on a 137″ boom.
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