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3 Elements Yagi

3 Elements Yagi

Postby qrz11 » 13 Feb 2011, 14:19

* 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.

Marc, the owner of the antenna above, worked since 2000 with 100 watts
till now (march 2006) 225 DXCC (ssb)
In my early stages of DXing, this was my first DX-antenna wich resulted
in 60 DXCC....with 4 watt 40 channels in FM !

Compared to a dipool the mentioned gain of 6 dB will provide an
equivelent from 400 watt on a dipool to 100 watt on the 3 elements yagi.

When you improve your system you will notice a big difference between
a 2 or 3 elements yagi. And still capable of being rotated by a small
rotator (TV-rotator, like channelmaster etc..)


Long version BOOM LENGTH 3,68 M Type HPSD 3 L


Design freq = 27,55 mhz ----------A = 4,88 m
Gain = 6 dBD-------------------------B = 5,20 m
F/B = 30 dB---------------------------C = 5,36 m
Beamwith = 99 degrees-----------D = -2 m
Bandwith = 1,1 mhz----------------E = 1,68 m
Element thickness = 22 mm

Image

short version BOOMLENGTH 2,50 M Type HPSD 3 S

Design freq. = 27,55 Mhz--------------A = 4,94m
Gain = 5,1 dBD---------------------------B = 5,28 m
F/B = 25,5 dB-----------------------------C = 5,60 m
Beamwith = 117,6 degrees------------D = - 1,50 m
Bandwith = 1,1 Mhz---------------------E = 1 m
Element thickness = 22 mm



.
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Re: 3 Elements Yagi

Postby Freebander » 11 May 2011, 08:37

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.
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Re: 3 Elements Yagi

Postby 29FB111 » 11 May 2011, 13:47

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:
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Re: 3 Elements Yagi

Postby qrz11 » 12 May 2011, 18:02

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"
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Re: 3 Elements Yagi

Postby 26sd204 » 12 Jun 2011, 00:27

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.......
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Re: 3 Elements Yagi

Postby Madmark1 » 27 Jun 2011, 01:25

Here is my home made 3 element yagi.




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Re: 3 Elements Yagi

Postby qrz11 » 27 Jun 2011, 08:43

Hi Madmark1

TNX for sharing.
Realy cool vid. Good luck and lots of dx with this antenna.
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Re: 3 Elements Yagi

Postby Madmark1 » 27 Jun 2011, 13:08

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.

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