Transcription of Compact Multi-Band Rotatable Dipole Antenna Array
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Compact Multi-Band Rotatable Dipole Antenna Array
Compact Multi-Band Rotatable Dipole Antenna ArrayDr. John A. Allocca, WB2 LUA, , 4/9/12 IntroductionHaving limited space led to the design of this Multi-Band Antenna Array , which has a foot print of approximately 15 feet. Because dipoles are directional, as seen in the Dipole Radiation 3D Pattern diagram, an Antenna rotator is required for maximum Antenna gain in a specific direction. Two 1/4 wave ham sticks in a Dipole configuration produce a 1/2 wave Dipole Antenna . The four bands planned are 80 meters, 40 meters, 20 meters, and 10 meters. However, almost any combination of ham sticks can be used. A 2m/70cm vertical Antenna may be placed on top of the three foot aluminum mounting pole along with an additional coaxial cable.
One of the most effective antennas for NVIS is a dipole that is mounted from 0.1 to 0.25 wavelengths above ground. When a dipole is brought very close two ground, the angle of radiation increases.
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