10/15m Band Portable Yagi Antenna

Dualband portable 2 elements yagi antenna for 10m and 15m CW. The idea behind it is simple; We construct a 2-elements Yagi antenna for 15m band, then add 10m band 2 elements yagi into it so the driven element for the 10m band is open-sleeve-coupled from the 15m band driven element. This method of feeding will results of an easy-to-construct-and-feed dualband yagi antenna at the expense of narrower bandwidth at the higher band. The narrower bandwidth is not a problem since the usage at 10m band is intended for CW portion only.

Dimensions

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Tuning procedure:

• Mount the antenna at the real installation height, or at least 7 m above the ground.
• Tune the 15 m band driven element for the lowest VSWR at 21.05 MHz. Adjust both end simultaneously.
• Tune the 10 m band driven element for the lowest VSWR at 28.05 MHz. Adjust both end simultaneously.
• Back to 15 m band and check if whether the VSWR shift after 10 m band tuning. If so, then re-adjust the 15 m band driven element.
• Again, back to 10 m band and check again. Repeat this procedure until VSWR is satifying at both band.

Typical VSWR:

• 15m band; 1.04:1 at 21.05 MHz
• 10m band; 1.12:1 at 28.05 MHz

Typical gain:

• 15m band (10 m above ground); 11.5 dBi
• 10m band (10 m above ground); 12.4 dBi

Simulation Results (15m Band)

Simulation Results (10m Band)

Propagation Map Simulation (VOACAP Online, May 2019)

15m band at 9 UTC

10m band at 11 UTC

Contributing

1. Fork it https://github.com/handiko/Portable-Yagi-10-15-2E/fork
2. Create new branch (git checkout -b myfeature)
3. Do some editing / create new feature
4. Commit your works (git commit -m "Adding some myfeature blah blah..")
5. Push to the branch (git push -u origin myfeature)
6. Create a new Pull Request