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2 EL Delta Match Yagi
Topic Started: Saturday, 9. January 2010, 23:22 (1,747 Views)
HomerBB
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2 Charlie Tango 004

I built a workable 2 el yagi with a gamma match. http://www.worldwidedx.com/home-brew-mods/...-2-element.html
Now i am trying to get this one right: Using Delta Matching on HF Beams by dxzone.com.
I am close. I want to center resonance on 27.185, but currently the SWR is 3.0:1. I get a SWR of 1.4:1 on 28.755. Clearly I am centered too high. I have followed the formulas as exactly as I know how converting all metric units to inches.
What I need is some input on what may help to bring it down. I am inclined to adjust the RG58U 4:1 balun length, but am not sure which way to go.

Any help is appreciated.

Driver length 18' 0.5"
Director length 16' 8"
Boom length 2' 10"
Darm length 2' 5.25"
Darm spacing 3' 7"
Mbalun length 12' 10.1"
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2CT004/2WR183
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HomerBB
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2 Charlie Tango 004

Got the SWR down to 1.0:1 on ch 19. Don't know if the antenna's any good. No Skip, no analyzer, and gotta go to work. Details later. . .
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2CT004/2WR183
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Beany
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Charlie Tango DX
would love to help but the building antennas lark goes right over my head :o :D
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[marq=left]Top Quality Extension Speakers Available 2 X Different Sizes, PM Me Or Look In The Market Place[/marq]
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HomerBB
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2 Charlie Tango 004

I may have to go at the boom again, but I tried his formula for what I've got.

Even my solutions doesn't make much sense.


Here is a little info:


Driver length 19' 6"
Director length 17' 6"
Boom length 3' 2 1/2" Through Space 2' 10"
Darm length 3' 2 1/2"
Darm spacing 4'
Mbalun length 12' 10.1"

Boom 1 1/2" aluminum tube
Elements 1/2" x 10' EMT centered and 3/8" x 6' coated plant stakes adjustable rods for ends of elements.
Delta arms #12 solid steel wire


SWR:

28.855 2.1:1
27.405 1.1:1
27.205 1.0:1
26.965 1.3:1
26.515 2.1:1

[img]Here is a little info:


Driver length 19' 6"
Director length 17' 6"
Boom length 3' 2 1/2" Through Space 2' 10"
Darm length 3' 2 1/2"
Darm spacing 4'
Mbalun length 12' 10.1"

Boom 1 1/2" aluminum tube
Elements 1/2" x 10' EMT centered and 3/8" x 6' coated plant stakes adjustable rods for ends of elements.
Delta arms #12 solid steel wire


SWR:

28.855 2.1:1
27.405 1.1:1
27.205 1.0:1
26.965 1.3:1
26.515 2.1:1


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2CT004/2WR183
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Mark in Essex
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26 Charlie Tango 037

Nice looking beam there ....i wass gonna ask for some pics...beat me to it any chance of some close ups where the feeder connects to it ...cheers Homer :)
[][img][/img][/url]

https://www.youtube.com/user/26TANGOMIKE037/videos



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But I prefer alcohol
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HomerBB
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2 Charlie Tango 004

Mark in Essex
Jan 14 2010, 06:20 AM
Nice looking beam there ....i was gonna ask for some pics...beat me to it any chance of some close ups where the feeder connects to it ...cheers Homer :)

Okay on the photos of the feedline connection.
Here you go:

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this is the coax entering the box with a CMC choke at the antenna feedpoint

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this is a shot of the coax 4:1 balun entering the box (bottom of the box)

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inside the box showing the connections

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A full shot of the connections including the delta match on the driven element

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this is the construction of the 4:1 coax balun
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2CT004/2WR183
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