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.
Very nice build chris if a little weighty ..
never got round to building my own Yagi yet..
Jim G1wkk
Yes, very weighty really but good fun and worked OK. Thanks for commenting!
That is a serious Yagi, very neatly done, I have been using 6mm rod on mine and had reasonable results
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