Raynerd.co.uk

3 Element Yagi for 2m VHF

After passing my Foundation Licence only a few weeks ago, I wanted to work SSB on 2m and my roof mounted vertically polorised colinear X200 clearly wasn`t up to the job. I decided to try a homebrew 3 element Yagi, the dimensions and details were all provided by Neil, many thanks:

1. Reflector – 1040.6mm long and fixed at the end of the boom.
2. Diven element – 2 lengths of 475.3 – 10mm gap between them. each individual part of the driven element is insulated from the boom and each other.
3. Director – 842.8mm long and fixed to the boom 737mm from the reflector.

I started of with the parts: 12mm steel rod – 2m length, 12mm steel rod – 1m length, 20mm square ally tubing – 1m length, 20mm dia clear acrylic bar.

I then started on the driven element, making my acrylic insert that would slide into the 12mm tubing and provide a 10mm insulated gap between the two. They needed to be a tight fit so that the driven element would remain rigid as one despite the gap.

The insert in one of the sides of the driven element:

Both connected, nice and tight fit and they felt pretty rigid:

Then the driven element was mounted in a box to protect the cables and insulate from the boom:

I then needed to produce some sort of insulating mounts to hold the elements correctly on to the boom. I had some plastic mounting blocks knocking around, so using a 12mm drill I drilled a half circle into a couple of these:

I bolted the elements onto the boom and there it finished – a 3 element Yagi for use on 2m. A brief test portable showed it to work really well but I`ll post more when I have tested again.

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4 responses to “3 Element Yagi for 2m VHF”

  1. Jim Arnott says:

    Very nice build chris if a little weighty ..

    never got round to building my own Yagi yet..

    Jim G1wkk

  2. Raynerd says:

    Yes, very weighty really but good fun and worked OK. Thanks for commenting!

  3. machineman says:

    That is a serious Yagi, very neatly done, I have been using 6mm rod on mine and had reasonable results

  4. Luis Ramos says:

    Astonishing but… what about the length of boom?
    What distance of driven element to reflector?
    The boom is squared?…how many m/m?…which material?
    And finnaly what about conexions of coax cable?

    Cheers

    L. Ramos PU1ROV

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