By continuing your navigation on this site, you accept the use of cookies to offer you contents and adapted services. Legal Notice.

Building a 137 Mhz QFH antenna

Making a Quadri Filar Helix antenna
 

Original concept
 

00.jpg

H1-H2.png

Shema Perspective.jpg

01.jpg

02.jpg

Entretoise.jpg

03.jpg

04.jpg

05.jpg

06.jpg

07.jpg

08.jpg

09.jpg

11.jpg

12.jpg

13.jpg

14.jpg

15.jpg

16.jpg

17.jpg





F4BPP's improvements


Schema English.jpg

  • 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.


 

Tiges-Aluminium.jpg

Domino.jpg

Fixation.jpg

Inside.png

Antenne.JPG