https://github.com/handiko/yagi-4e-144
4-elements Yagi Antenna for 144.3 MHz - 12.5 Ohm design. Meant to be fed using a gamma match.
https://github.com/handiko/yagi-4e-144
antenna antenna-model vhf vhf-antenna yagi yagi-antenna
Last synced: 25 days ago
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4-elements Yagi Antenna for 144.3 MHz - 12.5 Ohm design. Meant to be fed using a gamma match.
- Host: GitHub
- URL: https://github.com/handiko/yagi-4e-144
- Owner: handiko
- License: gpl-3.0
- Created: 2019-01-13T20:31:12.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2020-04-28T22:13:37.000Z (about 5 years ago)
- Last Synced: 2025-02-13T03:17:54.059Z (3 months ago)
- Topics: antenna, antenna-model, vhf, vhf-antenna, yagi, yagi-antenna
- Homepage: https://handiko.github.io/Yagi-4E-144/
- Size: 6.01 MB
- Stars: 1
- Watchers: 3
- Forks: 9
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# 4 Elements Yagi Antenna for 144.3 MHz
4-elements Yagi Antenna for 144.3 MHz - 12.5 Ohm design. Meant to be fed using a gamma match.
This antenna won the Techno Antenna Fair 2014 - 2015 for Directional Antenna Category.
## Properties
* Elements : 1 reflector + 1 driven element + 2 directors
* Boomlength : 1.5 m
* Material : Aluminium alloy tubes / rods
* Input impedance : 12.5 Ohm resistive nominal (use a gamma match to bring it to 50 Ohm)
* VSWR : better than 1:1.1 (when matched using a gamma match)
* Gain : better than 16 dBi (simulation, at least 3 meters above average ground, horizontal polarization)
## Geometries
|Element |Length,mm (full span)|diameter,mm|Position,mm|
|:-------------:|:-------------------:|:---------:|:---------:|
|Reflector |1020 |4 |0 |
|Drivent element|949 |10 |320 |
|Director 1 |942 |4 |860 |
|Director 2 |922 |4 |1480 |
## Simulations
The simulation files are included in **Yagi-4E-144/models/**. The .nec file is created using [4NEC-2](https://www.qsl.net/4nec2/) and .maa file is created using [MMANA-GAL](https://hamsoft.ca/pages/mmana-gal.php)
## During Testing
## Contributing
1. Fork it [https://github.com/handiko/Yagi-4E-144/fork](https://github.com/handiko/Yagi-4E-144/fork)
2. Create new branch (`git checkout -b add-blah-blah`)
3. Do some editing / create new feature
4. Commit your works (`git commit -m "Adding some blah blah blah.."`)
5. Push to the branch (`git push -u origin add-blah-blah`)
6. Create a new Pull Request