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Quadrafilar Helix antenna for 436 Mhz
This is an antenna that I just built. I intend on using for receiving the AO-27 downlink at 436.800 +/- doppler. It is built with right hand circular polarization, and the gain is supposed to be in the neighborhood of 3 DB
post 29 Jan 2024
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This 50 ohm impedance antenna, when powered with 25-100W of RF in SSB, joins the Molniya orbiting satellites as AO-40 and AO-10
The main boom is 25 mm. sq. galvanized steel tube with a 1.6 mm. wall thickness, and 5m. long. This is for a 10 turn helix, and allowing approx 400mm
In the practical construction of a half-turn quadrifilar helix it is especially important to respect the exact lengths of the helical wires
How to make a quadrifilar helix QFH antenna easily from inexpensive materials PVC plumbing pipe and RG-58U co-axial
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