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Quadrifilar Helical Antennas


The Quadrifilar Helical Antenna, it ideal for a number of uses. Satellite reception and transmission may be number one among them
post 29 Sep 2020


Helix Antennas Links

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435MHz 12 turn Helix Antenna
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

A 16 Turn S-Band Helix
antenna for Oscar-13 mode-S. Perfect beacon reception at all times is possible, and acceptable SSB even at 43,000 km range

A Helix antenna for 2 metre satellite
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

A Home made Helical antenna for a GPS
In the practical construction of a half-turn quadrifilar helix it is especially important to respect the exact lengths of the helical wires

A quadrifilar helix weather satellite receiving antenna
How to make a quadrifilar helix QFH antenna easily, from inexpensive materials: PVC plumbing pipe and RG-58U co-axial