QHA Quadrifilar Helix Antenna
La QHA nasce come antenna per RX dei satelliti polari NOAA, METEOR
post 21 Dec 2021
Helix Antennas Links →
Helix 435mhz uhf
It's actually 9.25 turns, including the quarter-turn impedance transformation to get a 50 ohm feed
Helix antenna design and construction details
Design frequency MHz, Number of turns, Turn spacing, wavelengths
Helix antenne
We decided to put it to the test and build a PVC helix for a 'too high' frequency. Then we wanted to redetermine the center frequency. 2430 MHz is approximately 67% of 3620 MHz. So that will be the design frequency that we give to HelixCalc
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It's actually 9.25 turns, including the quarter-turn impedance transformation to get a 50 ohm feed
Design frequency MHz, Number of turns, Turn spacing, wavelengths
We decided to put it to the test and build a PVC helix for a 'too high' frequency. Then we wanted to redetermine the center frequency. 2430 MHz is approximately 67% of 3620 MHz. So that will be the design frequency that we give to HelixCalc
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