Home -> Moxon Antenna for 2mt
What's up ?
The Moxon antenna is a good size and good gain antenna invented by Les Moxon, G6XN, and it is cheap to build. All information on how to build your Moxon antenna and other resources (photos, design requirements, etc.) are explained on the Moxon Antenna Project website. On this page I want to share my experience with users of design and construction of the antenna, by a diagram and photos, and an evolution step by step how it was built.Central Frequency:145.000 MHz
Materials:
- 1 * aluminum pipe - 4mm Ø diameter - 2000mm lenght
- 2 * plastic pipe - 7,5mm Ø diameter - 1000mm lenght
- 1 * fast glue
- cable ties, to temporarily fix the aluminum gauge the exact distance between the elements and then put the glue
- 1 * plastic pipe for electrical systems - 15mm Ø diameter - 2000mm lenght
- 2 * terminal caps - 10mm Ø diameter
Moxgen
Moxgen is a small program to automatically generate the size of the elements.I set the center frequency in MHz bandwidth 145,000 The program can be downloaded from the website of the Moxon Project.
Building:
- Prepare and cut the exact size
- Assembling - Photos
As seen on the project site, Moxon antenna consists of two elements in the radiator and reflector, and the radiator is made up of two parts, so in total there are 3 elements.
First, to achieve the reflector is necessary to cut the aluminum pipe into two parts, its length is the result of 2 * D + A.
In this project, its theoretical dimension is 2 * 142.8 mm + 743.3 mm = 1028.9 mm,
The remaining part is the radiator, and it is necessary to achieve a length of the rod given by the formula 2 * B + A or 2 * 98.7 mm 743.3 mm = 940.7 mm (which would later split into two equal parts of size 940.7 mm / 2 = 470.35 mm each).
I have bought a 2000mm lenght pipe and should advance 2000mm - (1028.9 mm 940.7 mm) = 30.4 mm
To practice: I decide to cut the reflector at 1031.0mm and the radiator to make exploits the advantage of having bought a pipe just 2 meters long, I decided for now not to eliminate the excess (of 969mm - 943mm = 26mm, which would correspond to 13mm for each half), but just to cut this piece into two parts, obtaining two 969mm / 2 = 484.5mm, and use 6mm of surplus 13mm as the terminal point for contact with the coaxial cable on which screw the mammoth terminal (for each half cut 7mm radiator).
Then, I cut the plastic tubing to create a skeleton on which to fix aluminum parts: two tubes of size 280mm and one 750mm.
First I attached with cable ties to create the skeleton of the rectangle, then I calibrated with precision the distance C between the elements of aluminum and then I used the glue to the final fixing. I obtained this structure fixed to the pipe with cable ties for electrical installations. I fixed the coaxial cable to the terminals of the radiator through the mammoth terminals.
The first half radiator [(2 * B + A)/2] lenght 969mm / 2 = 484,5mm
Plastic pipe for skeleton 280mm.
Part of reflector ( 2 * D + A) or 1031,0mm
First fixing
After placing well the distance between the radiator and the reflector, I proceed with the glue to fix definitively the elements aluminum skeleton.
Enjoy!