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Building a 137 Mhz QFH antenna

Making a Quadri Filar Helix antenna
 

Original concept
 

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F4BPP's improvements


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  • Use 6 mm diameter raw aluminium full pipe.
  • Remove 8 elbows to make the junction with the antenna elements by bending the pipes.
  • Only 4 junctions with 8 mm diameter raw aluminium hollow pipe to avoid impedance loss.
  • Coaxial cable protected inside the 32 mm PVC pipe.
  • Use electric dominoes to connect the cable to the antenna to avoid drilling pipes and ensure better contact between the cable and them.


 

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© David OLIVARES - F4BPP