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A 2.4Ghz Low-Power for 802.11 Vertical Collinear
Collinear antenna, that was based off of UHF repeater Antennas. This one is more suited for 802.11 operation
post 04 Apr 2024
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A coaxial collinear antenna for 70 CM
The guiding principle is that we have multiple 1/4 wave elements fed in series , the radiation from each adds in phase to produce a large vertically polarised omni-directional antenna with bstantial gain
Build a 2.4GHz Vertical antenna
Array built here will yield 6dBi gain in a radome of less than a meter
Build A 9dB, 70cm Collinear Antenna
First remember that there is something called the velocity factor for coaxial cable. For RG58/U coax it is typically .66. All that aside now, lets calculate the 1/2 wavelength of RG58/U coaxial cable with a frequency of 444 Megahertz
Coaxial Colinear For 432 MHz
You can use low-cost coaxial cacle to make a simple high performance omnidirectional vertical antenna
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The guiding principle is that we have multiple 1/4 wave elements fed in series , the radiation from each adds in phase to produce a large vertically polarised omni-directional antenna with bstantial gain
Array built here will yield 6dBi gain in a radome of less than a meter
First remember that there is something called the velocity factor for coaxial cable. For RG58/U coax it is typically .66. All that aside now, lets calculate the 1/2 wavelength of RG58/U coaxial cable with a frequency of 444 Megahertz
You can use low-cost coaxial cacle to make a simple high performance omnidirectional vertical antenna
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