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A Three Element Yagi Mini-beam
After lots of experimenting the results are shown below
post 27 Mar 2024
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Combi-dipole for 30 and 40m
After some experiments I could dip the trap around 10 MHz with a coax capacitor (17cm of RG214) of 17pF. So the coil at 10 MHz has an inductance of 14.7 µH at 10 MHz
Dalle VHF alle HF
Questa antenna per HF e' stata realizzata in un materiale poco usuale, cioe' tubi in plastica rivestiti di foglio d'alluminio
Dismantable Yagi for the bands 10-17m
The distances between Reflector-Radiator and Radiator-Director are the same on all bands from 10 to 17m. When changing the band you only have to adjust the element-lengths
Beam optimized for radio direction finding
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After some experiments I could dip the trap around 10 MHz with a coax capacitor (17cm of RG214) of 17pF. So the coil at 10 MHz has an inductance of 14.7 µH at 10 MHz
Questa antenna per HF e' stata realizzata in un materiale poco usuale, cioe' tubi in plastica rivestiti di foglio d'alluminio
The distances between Reflector-Radiator and Radiator-Director are the same on all bands from 10 to 17m. When changing the band you only have to adjust the element-lengths
Take off angle of horizontal antenna For horizontal polarization, the electric field will move sideways on a horizontal plane, while for vertical polarization it will oscillate up and down on a vertical plane
Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m
Calculo da Antena Bazooka A double bazooka antenna is a combination that has a complete coaxial wave multiplied by its velocity factor and a total end-to-end length of 1/4 wave for each side affected by another driver shortening facto