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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 09 Feb 2024
Quadrifilar Helical Antennas

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 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


Take off angle of horizontal antenna

Take off angle of horizontal antenna For horizontal polarization, the electric field will move sideways on a horizontal plane, while for vertical polarization it will oscillate up and down on a vertical plane

Build a Three-Way Antenna Switch and Display

Build a Three-Way Antenna Switch and Displa To use a wireless relay to select one of two high current capacity power relays

5 element yagi antenna for 28.5 Mhz

5 element yagi antenna for 28.5 Mhz Gamma match will be made with a 1/2 "aluminum tube and a 75 cm coaxial piece of RG8 without sock and sheath inside the tube