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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


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