🗊Презентация Off-Center Fed Dipoles

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Off-Center Fed Dipoles Practical Applications
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Off-Center Fed Dipoles Practical Applications

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Looking for solutions for low band antennas Looking for solutions for low band antennas Was abused by a counterpoise as a child Looking for multiband solutions Traditional low band wire arrays use dipoles or inverted vees Applications to driven & parasitic arrays
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Looking for solutions for low band antennas Looking for solutions for low band antennas Was abused by a counterpoise as a child Looking for multiband solutions Traditional low band wire arrays use dipoles or inverted vees Applications to driven & parasitic arrays

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Half wave resonant antenna at lowest frequency of operation Half wave resonant antenna at lowest frequency of operation Even Harmonic resonances (V/I ratio is approximately constant) 160M: 160, 80, 40, 20, 17, 12, 10 80M: 80, 40, 20, 10 Fed 1/3 of the way from the end vs. in the middle Feed point impedance is approximately 200Ω 4:1 current balun does the trick
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Half wave resonant antenna at lowest frequency of operation Half wave resonant antenna at lowest frequency of operation Even Harmonic resonances (V/I ratio is approximately constant) 160M: 160, 80, 40, 20, 17, 12, 10 80M: 80, 40, 20, 10 Fed 1/3 of the way from the end vs. in the middle Feed point impedance is approximately 200Ω 4:1 current balun does the trick

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80M 80M Used for 10 years 136 feet in length (located at abt 30 feet) Fed 44.5 feet from one end Resonant on 80M, 40M, 20M, 10M (no tuner) 160M (measured data) Recent addition 264 feet long (located at abt 80 feet) Fed 88 feet from one end; 4:1 homebrew balun 200Ω on 160M and 166Ω on 80M at resonance 2:1 BW: >200 kHz on 160M, 260 kHz on 80M
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80M 80M Used for 10 years 136 feet in length (located at abt 30 feet) Fed 44.5 feet from one end Resonant on 80M, 40M, 20M, 10M (no tuner) 160M (measured data) Recent addition 264 feet long (located at abt 80 feet) Fed 88 feet from one end; 4:1 homebrew balun 200Ω on 160M and 166Ω on 80M at resonance 2:1 BW: >200 kHz on 160M, 260 kHz on 80M

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It’s just a dipole! It’s just a dipole! But ½ wave resonant element, then harmonic wire Voltage/Current relationship at 1/3 feed point provides essentially constant ratio on even harmonics Broadside null on harmonics
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It’s just a dipole! It’s just a dipole! But ½ wave resonant element, then harmonic wire Voltage/Current relationship at 1/3 feed point provides essentially constant ratio on even harmonics Broadside null on harmonics

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Feed point is at a current minimum Very high impedance
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Feed point is at a current minimum Very high impedance

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Same problem: Current minimum
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Same problem: Current minimum

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Old 80M design: 45.3 ft, 90.7 ft; 30 ft high Old 80M design: 45.3 ft, 90.7 ft; 30 ft high New 160M design: 88ft, 176 ft; 80 ft high Both use 4:1 Guanella balun design 80M variation: 45/65 ft flat+26 ft dropper Feed point impedance at resonance drops as effective height above ground decreases Recommend 1/3 λ up for 4:1 balun to work well
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Old 80M design: 45.3 ft, 90.7 ft; 30 ft high Old 80M design: 45.3 ft, 90.7 ft; 30 ft high New 160M design: 88ft, 176 ft; 80 ft high Both use 4:1 Guanella balun design 80M variation: 45/65 ft flat+26 ft dropper Feed point impedance at resonance drops as effective height above ground decreases Recommend 1/3 λ up for 4:1 balun to work well

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How to deal with the broadside null… How to deal with the broadside null… Rotate antenna to achieve best gain compromise
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How to deal with the broadside null… How to deal with the broadside null… Rotate antenna to achieve best gain compromise

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Your mileage may vary Your mileage may vary Batteries not included Some assembly required Professional driver, closed course Void where prohibited Do not dispose of in fire Taxes, titles, license fees extra 10M band openings longer than 2 hours require immediate medical attention
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Your mileage may vary Your mileage may vary Batteries not included Some assembly required Professional driver, closed course Void where prohibited Do not dispose of in fire Taxes, titles, license fees extra 10M band openings longer than 2 hours require immediate medical attention

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