Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

2 Element 2m / 3 Element 70cm Yagi

by ZS6TVB Apr 17, 2017
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As promised pics of my assembled antenna, results of testing will follow 73

Good Job.

Well done. It looks good. If you need a Balun as per DK7ZB's design you can try the way as in the attached picture. 5 - 6 turns should do I guess.

Hi , I just printed all the parts and bought does M5 nylon bolts, after i get the rods the assembly can be started.
Will let you now how the antenna works out. Thanks for the design and 73 from Belguim

This is great news! You are the first person to confirm that you have gone through the trouble to print all the parts. It will be nice to hear how the antenna worked out for you but I am confident it will provide you with many hours of pleasure from the stage of building, testing and eventually using it.

I appreciate your feedback.
73 from South Africa

The original plans include a balun for matching. Why isn't matching required for this?

To all my knowledge the balun is an optional.

Comments deleted.

Many questions. I've printed the main parts. Went with t-glase since its relatively long lived in direct sunlight.

  1. In your pdf drawing, what's the spacing from the bottom (0mm) to the first element? (How far up?)
  2. Moderately unfamiliar with yagis, does the coax ground go on the reflectors, director, or is the driven element the only one connected?
  3. Why use 3d printed screws? My printer isn't that accurate. I assume metal screws are ok.
  4. Where did you source the rods/boom from? I'll look at the local hardware store tomorrow but they're very limited in options.
  5. What's the highest wattage you'd recommend using?
  6. Additional photos of the competed antenna, showing the way you connected the wires?
Comments deleted.

Nearly a year since I put up the design and at last someone else is building it!

Thank you!

  1. The spacing from the 0mm mark to the first element (Reflector 2m) in this case is 200mm indicated just to the left of the element (Reflector 2m) on the drawing. The length of the actual element is indicated on the right by "Length="
  2. The coax inner and outer conductors are connected to the left and right portions of the driven element which consist of 2 pieces (therefore the different bracket with a window) The ninth picture, the one just after the drawing indicates it.
  3. I tried the Yagi with real metal screws and it messed up the antenna characteristics completely. You could buy nylon/plastic screws from an electronics supplier but I really had horrible success with my first iteration of the antenna using metal screws which completely desensitised the antenna.
  4. I got the rods from my local hardware supplier in South Africa.
  5. I am not sure what wattage the antenna will be able to handle but I guess any standard mobile or handheld up to 50W should be fine maybe even double that but I can not confirm this for you.
  6. See the ninth photo as mentioned above. The 14th Picture may also help. Connect the outer shield to one side and the inner conductor to the other on the element indicated as "Radiator" on the drawing. This is the Driven Element/Radiator which consists of 2 x pieces of rod with a gap in the middle. The total length from the left to the right of the Driven Element should be 939mm including the gap in the middle as indicated on the drawing. As easy as that.

I hope the above helps you IconicJ

Added end caps for final rounding off of the boom. 2 x of these parts may be optionally printed if required.
See the pictures of the end caps for more details.

I have added a simple drawing of the complete Yagi for clarification purposes with element lengths and placement positions on the boom clearly indicated.
I hope it helps anybody interested in building the antenna!

can't see three of the images ? wrong format maybe ?

Thanks Neon22

I fixed the images and added some more. They were too large. I had to resize them.

looking good :)