3 Elements Yagi

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qrz11
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3 Elements Yagi

Post by qrz11 »

* TNX to 19 SD 348 *

3 ELEMENTS YAGI

Image

The most commen used yagi.
it provides great gain and a good F/B with only a boom lenght we can
still handle.







.
Attachments
1,20 M 3el F-Yagi plan.pdf
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Freebander
Posts: 1
Joined: Wed 11. May 2011, 07:19

Re: 3 Elements Yagi

Post by Freebander »

I was thinking of having a 3 element yagi but i'm sure i read something somewhere that it has to be 30ft of the ground to be at it's best,theirs no way i could have that in my garden :cry: , i would of liked too have tried one instead of using a vertical.
29FB111
Posts: 1
Joined: Tue 10. May 2011, 23:09
Location: Rep of Ireland

Re: 3 Elements Yagi

Post by 29FB111 »

Freebander wrote:I was thinking of having a 3 element yagi but i'm sure i read something somewhere that it has to be 30ft of the ground to be at it's best,theirs no way i could have that in my garden :cry: , i would of liked too have tried one instead of using a vertical.
Billy 29FB111 wrote: I'm using one at the moment, its only 20ft off the ground and its working fine, obviously the higher you get it the better, but above 1/2 wavelength works fine :geek:
Billy 29FB111
qrz11
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Re: 3 Elements Yagi

Post by qrz11 »

Hi Freebander and Billy,

The best height for yagis till 5 elements is between 36 and 45 ft. DEPENDING on the size (boom) when I was in Europe I had a lil 3 element beam in the back of my yard only 12fh of the ground.... and it still preformed.

Well these were the "old days"
26sd204
Posts: 1
Joined: Sat 11. Jun 2011, 23:18

Re: 3 Elements Yagi

Post by 26sd204 »

Freebander wrote:I was thinking of having a 3 element yagi but i'm sure i read something somewhere that it has to be 30ft of the ground to be at it's best,theirs no way i could have that in my garden :cry: , i would of liked too have tried one instead of using a vertical.
in the early 80s i had a 4element yagi at only 15ft with good success its the turning circle you have to worry about above trees ect
and yes they were the good old days of proper propagation and president madisons now everybody runs icoms!including me.......
Madmark1
Posts: 2
Joined: Mon 27. Jun 2011, 00:22
Location: Blackwood south wales

Re: 3 Elements Yagi

Post by Madmark1 »

Here is my home made 3 element yagi.

[youtube][/youtube]

Mark
qrz11
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Re: 3 Elements Yagi

Post by qrz11 »

Hi Madmark1

TNX for sharing.
Realy cool vid. Good luck and lots of dx with this antenna.
Madmark1
Posts: 2
Joined: Mon 27. Jun 2011, 00:22
Location: Blackwood south wales

Re: 3 Elements Yagi

Post by Madmark1 »

Thanks for the thumbs up on the Video.

As for whats the best height, well that will change through-out the year as the 'F' Layers in the ionosphere change there height, But generally anything over 25 ft will work, Ideally over 34 ft is better. for low angle radiation your looking to get your take of angle in the region of 5 to14 degrees above 34 ft will get you there. Obviously any structures near the yagi will affect it especially if its metalic. If you go to high then you can actually over shoot you required area, say your looking to work E.U then you dont need it as high as if your trying to work Australia.

Mark
qrz11
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Re: 3 Elements Yagi

Post by qrz11 »

All elements are made out of 25mm, 20 and 16 mm

The 25mm is the centerpiece and 2 meter long,

The 20mm is 1 meter long and is inserted 15cm inside the 2 meter tube. (85cm visible)

The 16mm tube is inserted in the 20mm tube and needs to be as long as the total element length.
Attachments
1,20 M 3el F-Yagi plan.pdf
(215.43 KiB) Downloaded 10 times
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