2m Retractable Yagi Antenna

This Yagi is my standard for Backpacking. I have seen many solutions for SOTA, but this one from OE6STD is very convincing:

• lightweight (230g)
• small package size (21 x 37cm)
• no assembly needed, just unfold and extend the boom
• cheap and easy to source materials

We also make these Yagis in our annually antenna workshops together with our newcomers in OE6.

UPDATE 24.Sept.2022:
- Corrected mistakes in the manual
- Fixed the Boom Mounts that had still bug that made the screwholes asymetrical
- Added OpenSCAD file for convenience

Variants

• Flanged SMA connector on boom with (RG-58/RG-316)
• Cable clamp for coax tail (RG-58/RG-316)

Note:  You have to be careful if you are using the RG-58 variant with a flanged SMA connector. The Cable is quite rigid and might rip off the connector if not treated carefully

3D Printed Parts

• 1x Boom Mount for 16mm pipe
• 1x Boom Mount for 20mm pipe
• 1x Boom Mount for Dipole
• 1x Handle
• 1x Cable Clamp (depending on variant) 
• 1x Measurement tape drill guide A&B

Important: Some pipes seem to vary in outer diameter a bit. Change “d_pipe” in OpenSCAD file accordingly if you got a bad batch.

If you don't want to use the paper templates:

• 1x EN16/20 drill guide
• 1x EN25 drill guide

Other Parts

• 1x 300mm installation pipe EN16
• 1x 300mm installation pipe EN20
• 3x 100mm installation pipe EN25
• 6x M4x10mm cylinder head screws
• 9x M3x8mm cylinder head screws
• 6x M4 Washers
• 6x M4 Nuts
• 2x Cable shoes that can fit a M4 Screw
• 6x Zip ties (2,5mm x 100 or 3,5mm x 150)
• ~50cm RG58 or any thinner coax cable you have at hand
• 3m broad measurement tape (~2cm wide)
• ~15cm copper wire (1.5 or 2.5mm²)
• Duct tape for drill guides

Tools

• Drill (bench drill would be handy)
• Saw (saw guide would be handy, you can use a dremel instead)
• Clippers
• Metal file
• Soldering Iron
• Hot glue (for flanged connector on boom variants)

Instruction

The manual is provided as a PDF among the files.

Source

The 3D files are made by me, the antenna design comes from OE6STD. I have his approval to post and translate his files here. The original and more complex design can be found here: https://www.oevsv.at/funkbetrieb/ardf/technik/