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QHA Quadrifilar Helix Antenna
La QHA nasce come antenna per rx dei satelliti polari NOAA, METEOR
post 10 Jul 2024
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
Ferrite Shop Ferrite-shop on-line shop, cable clamps,toroids, cable cores, technic,ferrite material choice
Amateur radio kits by Kanga US
50MHz to 28MHz RX Converter The concept of the rx converter is quite simple and nothing really new. the local oscillator is a standard colpitts crystal oscillator producing the 22mhz lo signal