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Author Topic: looking for a DIY 3+ element 10M yagi  (Read 234 times)

KD0VE

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looking for a DIY 3+ element 10M yagi
« on: February 19, 2023, 07:34:39 AM »

Really enjoying 10M and want a better antenn than my hexbeam.  I have a good stock of alum parts to make one but have had no luck finding a good article or link.  Many thx to anyone offering advice.
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KJ6YI

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Re: looking for a DIY 3+ element 10M yagi
« Reply #1 on: February 19, 2023, 08:26:38 AM »

Look in the ARRL handbook. I have a 2018 version and in chapter 21, there is a description of a 10M beam with details for 3, 4, 5 element assemblies.
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KD0VE

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Re: looking for a DIY 3+ element 10M yagi
« Reply #2 on: February 19, 2023, 08:36:15 AM »

EXcellent.  thx for the tip.
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VR2AX

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Re: looking for a DIY 3+ element 10M yagi
« Reply #3 on: February 19, 2023, 12:43:09 PM »

The physical constructions aspects are worth looking at. The handbook versions are based on 'plumbers delight' where all elements and boom and boom support are electrically connected at DC level. This requires the use of gamma match to feed the beam. Most commercial beams use split driven elements which are insulated from the boom, as are the other elements, and use a beta match (with balun or choke). Good luck with the build.
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WA3SKN

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Re: looking for a DIY 3+ element 10M yagi
« Reply #4 on: February 19, 2023, 03:17:57 PM »

OK, determine dimensions for a dipole for the frequency you wish... for 10 meters should be about 16-17ft.
This is the driven element.
Add 5 percent to length and space it about .2 wavelength away, this is the reflector.
Subtract 5 percent from the length and space it about .1 wavelength opposite, this is the reflector.
Since you are unsure of the impedance, feed the driven element with twin lead or ladder line and run it to a tuner.  Tune for 1:1 VSWR.
The only question is where to point it... north, east, south or west.  Knowing when you will be operating will help here!
Vertical polarization will keep the signal radiating at a low angle.

-Mike.
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WB6BYU

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Re: looking for a DIY 3+ element 10M yagi
« Reply #5 on: February 19, 2023, 04:36:19 PM »

Some articles on HF yagis from W4RNL, with designs from 2 to 6 elements.
I have also used some of his VHF designs scales to other bands.
And a bunch of his 10m articles for the 10-10 club newsletter.
This set of articles is one of my favorites, discussing choices
for a 3-element 10m yagi.

DK7ZB has lots of designs.

G0KSC has some very high performance designs.


There are more, but these are a good starting point...

KD6VXI

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Re: looking for a DIY 3+ element 10M yagi
« Reply #6 on: February 19, 2023, 05:26:16 PM »

G0KSC has some good designs.

Google OWA 10 meter.

Screw a gamma match, beta match or any other drivel.  Split the driven element and drive it directly.  Use a 8 foot sleeve outside the coax to act as a feedline choke.

Now you know your pattern is going to be what you have for the design.

I'll never use anything other than OWA and a feedline choke now.

If you want bigger, I have friends running antenna designs at 70 feet and longer with up to 10 elements.

--Shane
WP2ASS / ex KD6VXI
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