What's up ?

• anodized aluminum pipe - 4mm Ø diameter - 2000mm length, cost 2eu
• 2 * plastic pipe - 10mm Ø diameter - 1000mm length, cost 2 * 2eu
• plastic cable ties, cost 50pcs for 1eu
• plastic pipe for electrical systems - 100mm Ø diameter - 2000mm length, cost 0,70eu
• 2 * terminal caps, cost 2 * 0,20eu
• economic rapid glue, cost 0,80eu

Moxgen

Moxgen is a small program for automatically generate the antenna dimensions. I set it for central band 145.000 MHz.
This small program can be downloaded from Moxon website.

Construction

• Prepare and cut the exact dimension
As seen in the project, the moxon antenna is composed in 2 elements: Driven and Reflector, while the driven element is composed in 2 parts, so in total there are 3 active elements.
First, i have to cut the aluminum pipe in 2 parts to realize the Reflector. His length is the result of 2 * D + A parts. In this project the dimension is 2 * 142,8mm + 743,3mm = 1028,9mm.
Then i have to cut the remaining part of the aluminum pipe into two parts, in which we are interested in the size matches the 2 * B + A, ie 2 * 98,7mm + 743,3mm= 940,7mm. This part should be cut into two equal parts, then 940,7mm / 2 = 470,35mm.
Note: Because the corners of the rectangle are in the reality of the curves (although very close) and because the aluminum pipe is full and not empty, i decide arbitrarily appropriate decimals of a millimeter to the nearest integer and add 1mm for each corner.
Hypothetical Final Size are: 1031,0mm for the first part, and 943,0mm for the second, then it should be cut into two equal parts (943 / 2= 471,5mm).
Second: After have cut the reflector part, i have 2000-1031 = 969mm. Now, I take advantage of the fact to have chose an aluminum tube exactly 2 meters length, and i decide not to eliminate the 969-943= 26mm part (which would correspond to 13mm for each half), but i cut this piece into two parts exactly the same: 969 /2 = 484,5 and to use those additional 484,5-471,5= 13mm per part as a point to mount the terminal caps.
Now I have to cut the plastic pipe to create a skeleton on which to set the aluminum parts: two pipes are 280mm length and one is 750mm


• Assembling parts - photo



This is half driven element [(2 * B + A)/2] part is 969 / 2 = 484,5


Plastic pipe for skeleton 280mm length


This is the Reflector ( 2 * D + A) part is 1031,0mm


First, I fixed the aluminum parts with plastic cable ties


Then, I used the rapid glue to immobilize the aluminum parts on the skeleton


I attach the 100mm pipe to give great stability and the possibility of mounting orientation


Finally, I connect the cable to the antenna terminals and add terminal caps
Note that terminal points must be scratched with sandpaper








Enjoy!

Ciro has a website at http://www.qsl.net/iz8hhq