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A gamma- or T-match section can be used for matching the feed line to the array. Computer-Optimized Yagis Yagi designers are now able optimize their designs for the parameters of gain, F/R and SWR across frequency bands. ARRL Senior Assistant Technical Editor Dean Straw, N6BV, has designed a family of Yagis for HF bands. 14, for the 10, 12, 15, 17 and 20-m amateur bands. For 12 through 20 m, each design has been optimized for better than 20 dB F/R, and an SWR of less than 2:1 across the entire amateur frequency band.

For best results the vertical section should be as long as possible. A good ground system is necessary for good results. 46 Chapter 20 THE AE6C DUAL-BAND INVERTED-L ANTENNA In July 1991 QST, Dennis Monticelli, AE6C, described a dual-band inverted L. 52. 9. For ease of explanation, only the 80/40-m version is described here. 375 λ long, which raises the antenna’s radiation resistance and feed-point impedance, and thus decreases the effect of ground losses. 75 λ long, and is therefore resonant on that band.

Most operators prefer to erect these antennas for horizontal polarization, but they can be used as vertically polarized arrays merely by rotating the elements by 90°. In effect, the beam antenna is turned on its side for vertical polarity. The number of elements used will depend on the gain desired and the limits of the supporting structure. Many amateurs obtain satisfactory results with only two elements in a beam antenna, while others have four or five elements operating on a single amateur band.

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Antennas & Projects

by Kenneth

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