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2 Meter Halo Antenna
Wanted an antenna that was simple, horizontally polarized and omni directional
post 20 Feb 2024
Antenna for UHF VHF Links →
Meter loopThe Antenna is more or less Omni Directional and horizontally polarized.It presents a high takeoff angle and is intended for use in the 144.200mhz area
New Helix Antenna DesignGain: 15.9 dBci approximately 1 to 1.5 dB better than the standard Helix antennas I have modeled, pattern: First Side lobes at 36 degrees down 14 dB Average of all remaining sidelobes <25 dB, bandwidth: <0.2 dB variability from 432 to 438 Mhz 50 Ohm Match at <1.2 VSWR from 432 to 438 Mhz
Omni-Gain Vertical Collinear for VHF and UHFAn omnidirectional collinear, is capable of surviving harsh environments. It's a good choice for repeater installations and can be top, or side mounted to the tower
Origine et principe de l'antenne directiveSimplicity in terms of its performance, equivalence with a Yagi antenna, optimally sized, three elements with wide spaced, or four elements with close spaced
Quad 4 elementi per i 144 MhzQuad 4 elementi il guadagno da circa 5,87 dbD ad un valore prossimo ai 10 dbD,con un rapporto F/B attorno ai 20 db ed un'impedenza caratteristica di 50 ohm
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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
Atu balanced feeder antenna system An ATU has the advantage of bringing the feeder-antenna system to resonance, act as a band pass filter both on receive and transmit and a low SWR