MYANTENNAS EFHW-8010 End Fed Antenna
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- čas přidán 31. 03. 2016
- Please see updated info • End Fed Half Wave 80-1...
After 3 weeks of experimentation and using EZNEC, here is what I consider to be the ultimate configuration for the EFHW 80-10. This provides the minimum amount of high angle radiation and maximum low angle radiation over the HF spectrum. I was more concerned with radiation pattern than SWR. The best SWRs was found with a straight wire, up high and fed on the high end however it was too directional and had high angle lobes off the back. The worst configuration was the inverted Vee which waste huge amounts of power shooting straight up!
I did not find a need for any line chokes. The coax is LMR-600 and it lays on the ground for 100 feet. This takes care of any "shack RFI" problems.
This antenna now begins at 6 feet above ground, where the black box is, goes vertical for about 50 feet then slopes gently to about 35 feet.
Would an extensive ground radial system help? Maybe on 80 meters but the radials would need to be a half wavelength, 130 feet each to really do much. I doubt if the upper bands would benefit but I might try a few just to see what happens. The ground rod is just for lightning protection, not RF.
So after many years I now have an all band antenna that performs as well and in many cases better than my doublet plus I no longer need to resonate the system with a tuner. Just a little "touch-up" on a few bands with the auto tuner is sufficient.
UPDATE 5/16/2016
After multiple attempts to run high power in cw mode I now recommend keeping your power below 150 watts otherwise the transformer will overheat and cause your SWR to increase. The ICAS power rating of 1KW is misleading and the definition of that term is ambiguous. - Věda a technologie
I put one of these up this last weekend. It's only about 35 feet high on both ends and I can't believe how well it works. Pleasantly surprised.
Great antennas, amazing company. I have the EFHW 4010 up 50' and worked nearly 3,000 miles at 50 watts on Phone, 20 meters. I have the ground lug grounded to an 8' rod about 10' feet away. Amazing results. Sold on EFHW antennas! Thanks, Steve so much for all the videos. Can't tell you how much I've learned from you.
Great video Steve. And what a beautiful place. I have fond memories of the US East Cost, the summer, birds singing......wonderful backyard you have.
I am very happy with the purchase of this antenna, on my IC-7300. It was the end of November 2016, and I needed to get up my first antenna quickly with winter approaching. I have the balun fed 25'+ from the shack with an RG-214 feed line, which lays on the ground. Balun sits on top a five foot 4x4, grounded as per instructions, with the antenna wire running up hill to a point almost 70' above my shack, in a tall oak and then straight down another 20' in an inverted V orientation. I easily DX all the way E (Slovenia, Hungary) and everything in between, barefoot with 100W or less, in a SE to NW orientation. Have heard SA clearly, 7K+ miles away. Reaches deep into the Caribbean and SE USA. 17M recently opened up nicely, and finally now have QSO's in OR, CA and AZ. Thinking of sloping out the end of my wire, as per Steve's review, which I can easily experiment with. BTW, Steve's IC-7300 videos are also outstanding! Jon KC1FUU
I am using this antenna since I got my license in May, lt's a great Antenna, works very well , swr is about 2.5:1 at the higher portion of 80 meters but the radio's tuner takes care of that, could also be my installation, for 160 meters I use an MFJ tuner and it performs surprisingly well.
Furthest I got so far was Chile from Ireland with 100 watts, I don't get a lot of time to get on the radio but I was really happy to get Chile @ 100 watts SSB !
Can get to USA, Canada and most of Europe that I have tried so far with 100 watts no problem with this Antenna.
The antenna is about 65 foot at the high point to a tree at the East of my garden, then runs west for about 98 feet to another tree about 40 feet high, then south to another tree at about 50 degree angle and the UNUN is about 2 feet off the ground and I have it grounded there.
Cheers
Mark
EI3IBB
Thanks Steve, I think I will order one of these - credits to your review here- 73!
Thanks Steve for info and you tube on your antenna. I have not heard of this antenna before. cheers.CZ ee
Excellent set-up and absolutely adorable puppies". Thank you for the very instructional vid.
EXCELLENT! Someone who read the instruction and installed an END FED correctly. I would have choked it personally but yeah good.
Nice L ant. The two dogs are priceless wondering what you doing next door.
Nice video -- even liked the "dog problem" interlude...
Looking forward to the video an the next myantenna ran as you mentioned in the video. Thank you for posting, and as always. 73's
KN6BVX
Getting my EFHW-8010 today from MyAntennas. I have a quick and easy plan to mount it (house to a 40 ft tower that is about 150 ft away) but know watching this I am not sure. I planned to mount it low at least 10 feet to a height of 30 ft. in a north south line. Not sure but I can always move it later I guess.
I enjoy your happy song birds in the back ground.
New to all of this. What factored into your choice of direction to run the wire? Thanks! Chuck K7CFB
@@cfbarnett I live in a rural setting where I have a ton of space to have antennas however being a new operator myself and it was November of 2019 in Minnesota and I just bought an Icom IC-7300 so I needed a quick solution for an affordable antenna. I have a tower 150 ft from my house and an EFHW 8010 that is almost 130 long and covered multiple bands, it would work well in this situation. the next year I hired a guy with a bucket boom truck to raise the end point to about 35 feet. my feed point is about 10 feet off the ground. My low SWR points were below the bands I wanted to use so I later shortened the antenna and brought it to a respectable point so I could clean it up with my radio's internal tuner. The direction was set in stone because of the location of my house (feed point) and the location of my tower (end point) which happens to be a north south direction. It gives my nulls to the north and south and give me a good east and west coverage according to WSPR results. Hope this helps. I am moving my shack to an outside building and installing a 45 foot tower that was given to me next to it. I plan on moving my EFHW to that tower and also mounting a few stand offs for dipoles and putting a VHF/UHF antenna on the top of that tower along with a 40 meter rotatable dipole someday. I had a hexbeam given to me that will go up on a 30 foot mast also. The EFHW-8010 was a quick and dirty way to get my feet wet.
the best is that 450ohm line, WAY less loss than the LMR600... that doublet antenna you have is the best I think ! This is the antenna I would like to get but I have an issue to run the 450ohm line into the shack to the manual mfj tuner...
I have one as well and this thing works very very well, same set up as you have, but only up about 20 feet at the center, hung off of my tower,73 Phil ZF1PB
I agree. Since this video was made I have found several more ultimate configurations :*)
Is the "bend" of the wire actually resting on the tree..limbs and branches doesn't bother it at all?
The neighbor asked me what that big snake thing was dangling from the tree.
Excellent video about an excellent antenna!!!! KC9QVE Gas City,Indiana
I am thinking about an end fed....any problems with rf in the shack?
Seems to work well, I wonder if you are still pleased with it, five years down the road.
EFHW80-10 Antenna very good !!,,, 한국에서 사용 하고 있읍니다,,
I have one of these 35ft up between trees , works well
W4OW
I have a My Antennas EFLW with a 43 foot wire. My question is the Counterpoise? Did you OMIT the counterpoise, and simply run a ground wire straight down to a copper grounding rod ?
Bruce. What you have is the "Long Wire" version. Mine is the "Half Wave" version. With your system, a counterpoise is needed to best performance. With the EFHW version the coax can serve well as a counterpoise.
How did you throw the wire over the tree?
Bought an endured from them. Asked for a PDF of the recommended installation instructions and was told I should know like all hams the correct installation procedure. For an overpriced wire antenna I found it no better than my MfJ endfed wire with worse customer service.
myantennas.com/wp/wp-content/uploads/2021/08/Installation-Manual-EFHW-antennas.pdf
This is the pdf you are looking for. I found it very helpful. My experience with this antenna has been great. My antenna slopes from 31ft to 20ft going from the back of the house to a tree. During the 2023 CQWW SSB contest last weekend I worked 53 countries with about 12 hours of operating with 100W. I am not an expert contester or Dxer. My contacts include VKs which are10,000 miles from my Chicago area QTH.
nice dogs! I also use lot of time trying and modeling wire antennas. 73 de PY1ZB
Would like to put this my antenna EFHW 80-10 up. Is it possible to have the feed end close to the ground? Will be grounded in a rod 10 feet in the ground?
Yes. Perfect
Are you running any of Isolation filter ferrite or Big Ugly coils or just bringing directly into the shack? Also you said you had a tuner, have you tried to tune 160? If so was it usable?
I found it best to not use any common mode chokes at the antenna. You can use one at the shack end if you have RFI problems. This antenna can't do 160 because the transformer wants to see a high impedance of a few thousand ohms. On 160m a 130 foot wire has an impedance of only about 30 ohms! You could just take the transformer out and hook the wire directly to the coax for 160m ... I have another video doing that with a relay.
I am experimenting with an end fed random wire, but was thinking my insulated 14 G wire shouldn’t be touching branches or leaves. Consequently I’ve only gotten my wire 20-30 feet high as I thread it through be woods, suspended by rope. I have a unun on order, so may be my results will get better. Currently I have my random wire plugged directly into the back of my 1970’s era, Kenwood AT-200. 300’ run east to west, continues to 145 run south to north (for a total of 445 feet) but am contemplating adding an additional 355 feet east to west) 80 & 40 m SWR too high, 20 & 10 m SWR about 5 and tunable to about 1.2. Comments appreciated, especially about the wire directly contacting trees. Thanks.
Check the new Feb. 2018 QST for a technical article concerning trees and RF absorption. They certainly do! Your extremely long wire is doing a great job of distributing your RF into all the trees and earth. You would do well to cut the wire to resonance at the lowest band, feed it either at the end of center with the proper matching system / tuner and not run the wire through a tree. Having said that, my EFHW 160m wire goes right over a tree, laying on the branches then into a thick forest. It works ok but I'm sure I would gain some DBs if it weren't in the tree. Don't make the mistake of believing the old saw about "the longer and higher the better"... There's nothing scientific about that.
I just received my 8010 and am debating how to put it up so as to produce minimal interaction with other antennas. I’m wondering if I could extend the reach of the 8010 down to the 160 meter band by installing a coil after the transformer that I could switch in and out.
Watch this one ... czcams.com/video/Ree8NtpEEW4/video.html
Great antenna..
Steve, what did you use for the mast for your doublet at 2:55 ? Also, great job on your videos.
Rohn HD50 telescoping mast.
@@n4lq Thank you for the reply. 👍
I hooked this up not far from my Isotron, works great, almost 20 S units better, man these magic snake oil antennas sure work great. Look for my own new design where I connect my dummy load to 100' feet of coax and connect a long wire antenna to the center conductor.
20 S units... Well every little bit helps.
The only way I would have room is using it as an inverted V with a longer gradual slope on one end and running it through the top of a tree. Would this be acceptable? .
Yes it's probably the most common method of installation.
Interesting. I have the the 40-10 version. In speaking with the owner, I ordered additional wire and extended it to an 80-10(134 feet).
Now, I am only up about 20 feet in height. The orientation is 85 feet straight and then turning 90 degrees on a pulley, for about 35 feet and then to another pulley, back 14 more feet at about 110 degrees.
So basically a horizontal L.
WITH MY Icom 7300 and an Mfj- 939 auto tuner, I can work all bands but interestingly enough. This allows me to work 80 pretty well and 160, yes 160 meters fairly well!!
I did run a wire off the box to a ground rod and in experimenting, I laid an additional wire from the ground rod, along the grass, mirroring the length of the antenna. A sort of additional reflector, if u will?
I use to work a great deal of mobile CW back in the late 80's while travelling from up North here to Texas, South Fla LA. I bought a Hustler 40 Meter coil. As soon as I operated CW (100Watts)ic for 5 mins, the SWR would climb. I called Hustler, they sent me out a larger 40 meter coil, which worked just fine. Then I bought a Ham Stick or 40 and it worked fantastic. As in the case of the end fed coil, I feel it is under rated for CW as Stevee mentioned earlier in the video. Two Coils should eliminate the SWR creep on CW. I would imagine if Steve were able to go back out and feel the box after a 12 min CW qso, he may find it to be rather hot. my 2 cents... 73 and good luck! K8KEM
I am trying to figure out how to make something similar myself. It appears that the box is some type of balun such as a 5:1 or 9:1, the wire is 130 feet long, but from the pictures I have seen the is some type of coil on the antenna wire. I would appreciation anything you could tell me that would help try to make one. No one in our club has one. Where is the coil located on the antenna wire, how many turns, and diameter. Also do you know if there is anything in the box other than a balun and what the ratio is. Any help you can give would be appreciated.
The ratio is 50:1. QST reviewed the antenna and ran test on the transformer showing it had virtually no loss over the design frequency. The design seems to have hatched from the Netherlands. Myantennas had the core mix custom made for this application and that's probably a secret recipe. Here's a website with some information. pa3hho.wordpress.com/end-fed-antennes/multiany-band-end-fed-english/
73
Thank you for taking the time to help me. what is the story with the small coil on the antenna wire. I try to contact the designer but he is away until November 4th.
The story on the small coil is that; Due to velocity of propagation the correct length for the lower bands would be too short for the higher bands therefore the coil is added at a place that lowers the frequency of the resonance point only on the higher bands. I believe it's around 6 feet from the transformer with maybe 6 turns of wire and probably isn't very critical. I have found that this design works best if the wire can be installed in a straight line...The straighter the better.
Thank you for helping me
Is this an antenna you could zig zag and install in your attic?
I would simply say no. I would not work as advertised if you bend it up like a pretzel.
What is that mast made of? 4 ft sections?
The mast is a Rohn 50ft 5 sections of steel. You can still buy them. www.dxengineering.com/parts/roh-h50
You didn't mention what power it is rated for.
How does EFHW 4010 differ from the 80-10? I'm not interested in 80.
I have a antenna that is an almost identical build by UT5JCW, and was wondering what is the function of the small series inductor ?
Lee, WA8QFE
It is supposed to bring the 10 meter resonant point down in frequency. It's a harmonic thing. Like if the antenna resonates at 3550 khz multiply that by 8 and you're up to 28400. The coil has little effect on the lower bands. It's about 8 feet or 1/4 wavelength @ 10m from the feed point. 6 turns on a 1" pvc coupling.
OOps, just saw a comment on that coil on a earlier comment at the bottom....
Lee, WA8QFE
How did you get that up in the tree?
Wrist rocket sling shot, lead weight, 6 lb line.... Can shoot over 100 feet up... Lay spinning reel on ground, shoot over tree. Tie nylon string to monofilament line, pull back over tree, tie rope to string pull back over tree. Tie antenna to rope... Pull up. Done. It's good to have rope on softer branches so they give way in the wind acting as a spring.
Kenneth antenna launcher
I've asked 30 people without an accurate answer so I wanted to ask you brother. Is it possible to build an end fed antenna cut half wave length for 75 meters. Approx 124' of 18 ga copper clad wire using a 9:1 unun. " and NOT have to use a tuner on that frequency 3.930". My understanding is this particular antenna from myantennas is resonant from about 3.5-3.7 from 2:1 vswr sweep. However when the radiator gets trimmed to 75 , it rids multiband purposes. I contacted myantennas and they want 130$ for a flipping 75 meter antenna which is basically this antenna trimmed.
Glock. I am working on a way to make these work on 75m and still have low swr on the low end of the harmonics. However I am referring to the EFHW using a 49:1 transformer. Certainly not a 9:1 unun. A 9:1 would need to see 450 ohms.... 50 x 9 = 450 etc. The impedance at the end of a half wave wire is over 2,000 ohms. Hopefully I can get this working this week. Keep an eye on my videos.
Steve Ellington thank God Steve Thank you so much. A 49:1 is more like it. I don't know why these salesmen keep trying to sell me a 9:1 with 55' and say it's efficient on 75 meters. Not in my book hihi
Not unless you have a really super radial system !!
Steve Ellington its Nelson antennas on eBay and CZcams:/
As promised czcams.com/video/p5rbVG3dpX4/video.html
How well does the antenna perform for NVIS?
No different than any other antenna at low heights.
Thanks for the video! Anyone ever tell you you sound like Hank Hill?
My next review will include propane and accessories.
Hank.
Steve Ellington LOL! NO!
Dammit Bobby
Es esta Juan ocupado?
Hi. I also have a EFHW-8010 antenna for a year ago but today I detected a sound inside the box. I decided to open the box and found the two capacitors connected to the coil completely burned. Could you be so kind to open your box and send me the capacitors numbers to replace mine? Thanks a lot in advance. Francisco TI4FRU 73 from Costa Rica
Both are marked 221. That is 220 pf. Voltage rating 3000.
These are in series so the total would be 110 pf at 6000 volts.
I understand they help matching on 10 and 15 meters.
Keep your power below 250 watts CW.
73
+Steve Ellington thanks a LOT
+Steve Ellington Could be possible to send me a photo to jfranruiz02@gmail.com? Thanks a lot
I made a homemade one using 1 150pf 1000cap for just reg 100 watts and used 1 240-43 toroid , 7 x 7 turns same
How is this supported in the tree?
LMR-600 is about 2.50/3.00 a foot
A rope over a limb. Use RG-8x instead. It's cheaper. Just give up a few db.
*Is the wire actually touching the limb, or is it somehow insulated?*
I use 8x, it was either that or 7/8" Heliax Cable for 7 busks a foot!
I have never heard of LMR-600 until this video. however I have been inactive for 35 years so a lot has changed. I'm looking at HF rigs now and many of them look like a large cell phone. My last rig was a new Icom IC-701.
Not touching. Tie an insulator to the rope and the wire on the other end of the insulator.
Got it, thanks. I have never used an antenna like this. (involving a tree)
Pick a limb that's not too strong, one that has some flex to it otherwise the wind sway will break the wire. The softer limbs act like a spring.
...Meanwhile the poor city folk suffer....
why do you purchase antennas from MYANTENNA when your obviously capable of building your own ?
so you would watch the video
Steve Ellington i appreciate it, i just couldn’t figure it out.. i am glad i found it i built my own and got a good contact with S51dx in slovenia from here in west virginia. to say i’m happy is a understatement lol.. thank you