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Thread: Article: Multiband HF antenna...the easy way

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    Article: Multiband HF antenna...the easy way


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    Re: Article: Multiband HF antenna...the easy way

    Interesting...I think I have a couple of those yellow toroids in my junque box. If I can find them I gotta try this.

    John
    WD5IKX

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    It's amazing what can be done when you ignore the rulebook sometimes!

    What did you use to make your sock, and did you just stitch the antenna wire to it at intervals or did you do something else interesting?

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    OK so I have just finished my second 9-1 unun using a T80-2 with 18ga magnet wire. They work great with a wire thrown in a tree and no counter poise. I only run 5w so Not worried to much about bounce back and running a Z817 autotuner and 50ft of RG8. So now I need to come up with a couple of T80-26's and see if I can duplicate you results with a smaller unun on 5w. Sounds like fun to me. LOL.

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    Re: Article: Multiband HF antenna...the easy way

    I finally found it !!! You never know what you have in "Ye Old Junque Box". I remembered the yellow core but I did not remember that is was already partially done. I will have to change the connections since it looks like the original builder was making a Balun, add some hardware and it will be ready for trials. I hope mine works as well as yours.

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    I will have this done and ready to test in a few days if the thunderstorms will subside.

    John
    WD5IKX
    Last edited by M0LMK; 7th Jun 2015 at 08:09.

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    Re: Article: Multiband HF antenna...the easy way

    I finished the mix 26 unun today. Now I need to string up some wire and give it a test. Hopefully I will have good results like yours. Wish me luck. (o:

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    John WD5IKX
    Last edited by M0LMK; 7th Jun 2015 at 08:09.

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    That looks good John.

    Let us know how it does.

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    Re: Article: Multiband HF antenna...the easy way

    Last weekend was Field Day so I decided to try out the mix 26 UNUN. I took 85 ft of .030" (.8mm) copper-weld wire and supported it as an inverted V with the UNUN at one end and the other end was supported with a small rope about 5 ft above the ground. A 50 ft counterpoise wire laid on the ground below the antenna. I call it the "Field Day Special" and it worked GREAT!!! I was able to achieve < 1:1.3 SWR on all bands (160 meters through 10 meters) using my old Kenwood AT-200 tuner. It must be "punching out" a good signal since I broke through most Field Day pileups on the first try. During the 24 hours of portable operation at Field Day I made over 200 contacts with this antenna on all bands (I have not tried it on 160 meters yet) and got great signal reports. I noticed no de-tuning even when running 100 watts for long periods of Field Day activity. I plan to try various wire lengths and configurations and to test it without the counterpoise to see how that works. I also plan to compare it to my mix 2 UNUN to see if there is much difference.

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    Bottom line.......The mix 26 UNUN is a keeper.

    John
    WD5IKX
    Last edited by M0LMK; 30th Jun 2015 at 08:57.

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    Sounds like a total success John.

    Love the red light station!

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    Re: Article: Multiband HF antenna...the easy way

    Quote Originally Posted by M0LMK View Post
    Sounds like a total success John.

    Love the red light station!
    Yes my Field Day portable ops was a great success and the mix 26 UNUN antenna was a big part of it since it allowed me to work the all the bands when they were "hot". I used my 20 meter vertical for that band since it was the most busy and with the Field Day Special I could go back and forth between two bands without having to adjust the tuner. Waurika Lake park is a great spot to operate portable due to a very low noise floor (typically s0 to s1) and I the spot I used is on a small knoll with water near around. (see 180° panorama image) 34° 15' 54.12" N 98° 04' 51.66" W Elev 979'

    I use red lights when out with my telescopes and I noticed I have little problem with bugs so I use red lights when operating portable outdoors. I also like it because I can get dark adapted so I don't stumble over things when I walk away from the radio (or telescope) in the dark.

    One more outing and I will be ready for another award. (o:

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    John WD5IKX

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