Small 70-cm Yagi (671,292 bytes, PDF fileĪ 6-element Yagi designed for a wide bandwidth.Build this low-cost antenna system and hear what you've been missing For those not wishing to calculate phasing-line lengths, here is a phasing plan for two quagis on 144 MHz that should achieve at least 2.5 dB stacking gain. OSCAR users are switching to circular polarization to lessen signal fading. A 20-meter quagi would probably be a very good antenna, but it would be 140 feet (42.6M) long Moreover, gamma-matched dipoles work well at 14 MHz. Circular Polarization and OSCAR Communications (1,401,889 bytes, PDF file).This Log-Periodic Dipole Array (beam) antenna covers 130-170 MHz for those who also like monitoring. An LPDA for 2 Meters Plus (839,246 bytes, PDF file).Get about 10dB from a modified Radio Shack FM broadcast receiving antenna. A Five-Element, 2-Meter Yagi for $20 (457,324 bytes, PDF file).In typical Zack Lau, W1VT fashion, the element and mounting clamps are machined, but good ol’ hose clamps and hardware store mast mountings will work on this 4-element antenna. Homebrewing a 6-Meter Yagi (from QEX RF column)Įnlarged Figure 6 with key dimensions.7dB for 7 Bucks (844,127 bytes, PDF file)Īn inexpensive 3 element 2-meter Yagi made from PVC and welding rod.Shorten the 3/8" director tip sections from 31.5 to 31.25 inches.This should lower the 50.0 to 50.5 MHz SWR to 1.4 or better, modeled at a height of 20 feet. For improved FT8 use on 50.313 shorten the driven element 3/8" tip sections from 35.4 to 33.625 inches.
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