Antena QHA para satélites polares. (30STV)
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Quadrifilar Helix Antenna for Enhanced Air-to-Ground Communications
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Quadrifilar helicoidal antenna - Picture of Vaisala's GPS version
macpod on Twitter: "NOAA 19 4/25/2020 - QFH Antenna -> 20ft coax -> custom filter -> BT-200 LNA -> #sdrangel (Wideband FM, RBFW 45Khz, AFBW 17kHz, Sq set to min). I probably
Building a Quadrifilar Helix Antenna for Undergraduate Researchers
Radio for Everyone: NOOA 137 Weather Satellites - Antennas
