PDA

View Full Version : Article: Multiband HF antenna...the easy way



G4YVM
29th Apr 2015, 21:03
You can view the page at http://www.arpoc.org/content/135-multiband-hf-antenna-easy.html

WD5IKX
30th Apr 2015, 03:39
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

MI0PYN
30th Apr 2015, 08:08
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?

KK4UTO
1st May 2015, 18:14
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.

WD5IKX
29th May 2015, 23:22
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.

241

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

John
WD5IKX

WD5IKX
7th Jun 2015, 04:03
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:

273274

John WD5IKX

M0LMK
7th Jun 2015, 08:10
That looks good John.

Let us know how it does.

WD5IKX
29th Jun 2015, 22:37
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.

346347349348350

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

John
WD5IKX

M0LMK
30th Jun 2015, 08:58
Sounds like a total success John.

Love the red light station!

WD5IKX
30th Jun 2015, 15:20
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:

351352

John WD5IKX

WD5IKX
30th Jun 2015, 16:37
You can view the page at http://www.arpoc.org/content/135-multiband-hf-antenna-easy.html

Thanks David for the article and the tip about the mix 26 UNUN.

John WD5IKX

2e0lkc
3rd Aug 2015, 11:27
NICE ARTICAL MY HOME HF ANTENAR IS A MULTI BAND ITS A COMMET CHA/250B WELL RECOMEND BELIVE A LOT OFF DX EXSPEDITIONS
USE THIS ANNTENAR
PETE 2E0LKC

G0DZB
3rd Aug 2015, 13:18
NICE ARTICAL MY HOME HF ANTENAR IS A MULTI BAND ITS A COMMET CHA/250B WELL RECOMEND BELIVE A LOT OFF DX EXSPEDITIONS
USE THIS ANNTENAR
PETE 2E0LKC

No self respecting DXpedition would uses such a compramised antenna.

M0LMK
4th Aug 2015, 13:05
Peter's right. I would be very surprised if many operators went to the trouble of organising a DXpedition and decided to use a compromise antenna like the CHA/250B.

Would be interesting to see an outing that has used it and what their log looks like.

WD5IKX
4th Aug 2015, 15:05
It would really depend on the band conditions....if the bands were in good shape they would make contacts but if the bands were poor I expect their log would show it. I have heard very mixed reviews of that antenna. Some call it wonderful while others call it a dummy load.

John WD5IKX

G0DZB
4th Aug 2015, 15:50
It would really depend on the band conditions....if the bands were in good shape they would make contacts Indeed, we've all read the accounts of working DX on bits of wet string when the bands are in good shape
but if the bands were poor I expect their log would show it. Yes, its consistency that is the sign of a good antenna, the ability to make qsos under normal band conditions not just the opportunistic reporting of extraordinary contacts due to enhanced propagation conditions.
I have heard very mixed reviews of that antenna. Some call it wonderful while others call it a dummy load.
John WD5IKX
And probablly those that give favourable reports have never had the log term use of a resonant antenna system that doesn't rely on lossy ferrite transformers to give the illusion of efficient opperation.

mu0chn
19th Dec 2015, 12:19
What equipment should I be looking out for to find mix 26 toroids in. I need to get an antenna up at home and need something for portable work.

Help!!

73 Jes