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QHA Quadrifilar Helix Antenna


La QHA nasce come antenna per RX dei satelliti polari NOAA, METEOR
post 21 Dec 2021


Helix Antennas Links

35



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

10 m| 12 m| 15 m|
17 m 20 m| 2 m|
23 cm| 30 m| 40 m
6 m| 70 cm| 60 m| 80 m| 160 m| 136 khz
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