RANDOM WIRE ANTENNA with 9:1 UnUn home made (part 1)
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- Опубліковано 3 вер 2018
- I made the HF multiband Random Long Wire Antenna with UNUN 9:1 (my toroid T130-26 from an old PC PSU) publicated by VK6YSF on his website here:
vk6ysf.com/unun_9-1_v2.htm
In the second part of this video you will see the practical test of this antenna in a real outdoor conditions with QSOs on 40m band QRP with Xiegu X5105 transceiver and 5W only.
- follow link to this antenna after modification PART 2: • Modificated RANDOM WIR...
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Thank you very much for watching my videos! 73 Paul OM0ET
#endfed #antenna #multiband #homemade #om0et - Наука та технологія
To clear up some confusion in the comments...It is clear to see that you have 5 turns on the core. Each time the wire passes through the center of the core it is counted as one turn. Even though the drawing we see in the video has 10 turns the 5 turn toroid as built will work but more turns are preferred. The fact that it is a tri-filar winding, no matter how many turns, will result in a 1:3 turns ratio which also results in a 9:1 impedance ratio. This could be made with just 3 turns but, again, more turns are preferred. 10 turns would be much better. No matter how many turns it will always be 9:1 impedance ratio because of the 3 conductors in the windings and the way they are terminated. A ground or at least a length of counterpoise wire is important to achieve a satisfactory SWR.
Thank you very much for this very informative and clear comment 😉👍 Have a nice day and 73. Paul 🙋♂️
explained very well.
Interesting. Do you have a link for such of a schematic. If not, I am also assuming I can purchase one, but them may need the wire lengths. That for the main wire, and the counterpoise. Thanks. 73.
@@k2icc vk6ysf.com/unun_9-1_v2.htm
With three conductors there’s one primary winding and two secondary windings, a wind ratio of 2:1, isn’t that a match ratio of 4:1?
Paul, thank you for sharing your project. I learned a lot about a simple longwire antenna. Your construction was very clean and well laid out. Watching you go through the field testing was icing on the cake. I'm going to try building this antenna. I live in a hole so this would be the perfect antenna for me to run right down the edge of my property through a tree line.
Thank you John! If you will made your own antenna, try to use 16,2m or 42,5m long wire for your UnUn. Good luck with your own project! 73 Paul
Beautifully done! And another excellent video as well. Some wonderful results. Cheers!
Thank you so very much for this very wonderful, well put together and explained with hands on construction, I am saving this to my favorites because I also want to build this, you are very good at making instruction videos! with your explanation and showing step by step, it couldn't be any easier. God bless and have a wonderful day!
Thank you very much for this nice comment my friend 😊 When you will made this antenna you can use better toroid material 43 for better performance 😉👍 73 and good luck with your own antenna project! Paul OM0ET
Congratulations for such a neat video and for your hands-on experience. Loved it, I will surely try to make it. Thanks for making this video available, it's very easy for even a kid to follow your instructions.
I am so happy for your kind comment Kamal ;) Thank you! 73, stay safe! Paul.
Amazingly informative and concise. Perfect video! Thank you!
Thank you for the nice comment! :-) 73
This is inspiring! I need to build this antenna! Thank you so much. Brilliant presentation! New ham here!
Very good project - Well done - Thank you for sharing !
Excellent!
I have most of the parts needed. Just going to order the T15 toroid and build one of those myself.
A very good video, thanks for making it and you earned my subscription.
The built in SWR plot on your transceiver is very nice.
73's!!
Thank you very much for the nice comment! I wish you good luck with your own antenna Adam and look at my latest video about testing this antenna outdoors (part 3). 73
Muy bueno el vídeo que realizó muy bien explicado y fácil de entender le agradezco su tiempo dar para enseñar a la que estamos aprendiendo de los que saben mas.
73
Excellent build Paul, you always make it look so easy.
Happy the swr was so low across the bands. 73 my friend & good DX
Thanks Preston! ;-) 73, Paul
Very nice project that’s on my list to make. Thank you 😊 73🍺🎙
i wish you good luck with your own project. I used the toroid core from old PC switching PSU. :-) 73
Thank you for sharing this video. Cheers and 73!
Absolutely stunning vid, congrats.
Enjoyed you making the 9:1 yellow balun and 20 meter long wire antenna. Yes, it worked well. 73
Love this video lots of information easy to under stand thank you in spring will build one like the link 73
You did a wonderful job awesome a true person who knows technical things you have the right tools to work with really really looks great and it's working fantastic awesome job my friend thank you for sharing from Atlanta Georgia
Thank you very much for this nice comment Joe 😊 I am very happy that my videos are not useless and can bring something for HAM's 😉👍 it asure me that it's worth to do this more. Thank you again! 73 Paul OM0ET
SUPERB DEMONSTATIONS, VERY HAPPY WITH YOUR 9.1 UNUN , 73S
Really interestig vid. Thanks! I wanted a simple piece of wire
for 80.. and hopefully 160. I was just SHOCKED what a low end fed wire can
do! It's crazy. It's noisy, yes, but easy to put up. And other than the UNUN, its a simple piece of wire. I use it on all bands from 80 to 10. If anyone wants to see my experience, look for '80 EFHW & Multi tap UNUN. I'm not a youtuber tho... and don't really know what I'm doing. I'm just a simple QRPer in Michigan you see.... 73 OM!
Nice antenna build. Works very well!!
Thank you, yes i will test it more times in the future. I doesn't need tuner, that's good. 73 ;-)
Great presentation Paul, many thanks for sharing.
Thank you Bharat! 😉👍 All the best! 73, Paul
SWR 1.1 across the band. Unbelieveable. You said it!
Great video. I tried this with 8 turns and it works well. I used a NEMA (waterproof) box and put rubber behind the SO239 to help make it water resistant. It's a fun antenna to use at my weekend house. I'll eventually put up something more permanent, but it's a nice, easy antenna to deploy and get on the air. Thanks and 73
Great! Tim I hope you will enjoy this multiband antenna! 😃👍 Good luck and have fun! 73, Paul.
Wow, Paul that has got to be the best build vid I have ever seen, I’ve seen good ones but had to watch again and again to catch the odd connection and the like. Your camera work and the attention to detail you give your viewers is very impressive this is the standard everyone should try to master. Great SWR results off the bat.
OM0ET , I salute you and your Awesome vid👍🏼👍🏼👍🏼Regards 26CT3250. 73
Thank you so much for your very kind comment! ;-) Have a nice day and good DX! 73 Paul
Thanks for the video!
Great video. for sharing.
I built mine as per your U tube and it works just fantastic. .By adjusting the CP and the angel of the antenna wire I can get the SWR below 1,5-to -1 Thanks for sharing BOB AF2DX
Paľo išlo Ti to super. Gratulujem. 73!
Dakujem! 😉
Good video, very clear with both the construction and operation of the Antenna
Thank you! 😉
great workmanship,well done.
That is the coolest drill bit I have ever seen ;)
Thank you for a great video - very instructive - will be making one!
Thank you. Wish you good luck with your own antenna! 😉
Excelente e obrigado pela aula. Muito didática. Perfeita!. 73 Hugo Ruas front Brazil.
Excellent content.
Thanks and 73 from Osasco, Sao Paulo, Brazil.
Thank you 4 watching! 🙂
Espectacular!!!, intentaré hacer una... Gracias por la aportación a los colegas radioaficionados, OA4Y... 73!
Gracias! ¡Te deseo una antena! Te deseo mucho éxito en el trabajo. Estreñimiento y 73. Feliz Navidad y Feliz Año Nuevo! Paul OM0ET
LA RUEDA AMARILLA ES UN IMAN..?
Great video! Thank you!
Thanks for the great information Paul. Hope to hear you on the band. Roll on cycle 25
Thank you Dave! :) 73, will see you once on the air! Paul.
great results thanks so much
Another great video!
Thank you and 73!
Thank you very much! 😉
What ferrite toroid core did you use here?
I couldn't find any L15 on eBay.
I used yellow toroid from the old PC switching PSU
Ah, nice.
I've few old PSU around.
BTW, I found this chart:
www.karinya.net/g3txq/chokes/
Pretty useful :)
Yes but i am sure that better cores could helps.
very nice! excellent workmanship, also!
Thank you 😊
Been looking for a convenient antenna for field use, will give this one a go. Many thanks for this. M0KPK
Good step-by-step guide and very impressive results on QRP.
73 de SP2DMZ
Thank you for watching 😉
well thought out process and details
Thank you Philip 😊👍
God bless and have a wonderful day!
Thank you and God bless you to! ;-) 73
Paul great work. Im new amateur. I watch your video like and learn something.sorry for my English. Thanks for video.73.
Thanks! Welcome to our community. No problem my english is also not good... 😂 73
Nice work greats
73s from TI5WNF in Costa Rica
Thank you! :)
hacia muchos años que no veia un video sencillo explicado y montaje de los componentes,.juan cx3et.
Loved this video exactly what I was looking for and if you had not made it I'd still be looking for an answer to my long wire +balun project , all the best from m0omt stu in the uk
Thank you very much Stu for this nice comment 😊 When you will made this antenna you can use better toroid material 43 for better performance 😉👍 73 and good luck with your own antenna project! Paul OM0ET
brilliant work Paul (y)
Thank you!
Thanks you for contribution..............
Always love me some antenna videos, and testing. It's weird, but a HAM could have great antennas for every band, but he/she would still build/buy more. Your latest antenna is just a temporary fix until you get the next one. *lol*
Thank you! 😊 Sometimes is difficult to build own antenna because of no time, no space, no tools or no materials. Then is much easier way to buy a new commercial one 😉 Thank God I have this possibilities hihi. Have a nice day 🙋♂️ 73, Paul
@@OM0ET You're welcome, and I'm in a temporary location with no tools, space, etc., so I know how that is. lol
Great result from your antenna build. Your QTH must be an ideal location. Down the road a few KM and result might not be as good. QRP OP's that experiment with antennas know this so don't expect too much. We are happy when the antenna works better than expected. Great video and build. KB8AMZ
Thank you very much Terry! 😉👍 Yes QTH location is important but I believe that not so much when we work on short waves. We QRP'ers just need a good propagations, high point to hang an antenna on a quiet place without QRM and everything is fine 😀
73 Paul
Love your videos thank you
Thank you for your support 😉 73 Paul
Hi Paul. Thank you very much for your work and for your excellent videos. After I saw this video, I made myself a 9:1 UnUn with a toroide from an hold PC power source. With a 20m wire and 11,5m counterpoise wire, the antenna its working on 160, 40, 20, 17, 15, 12 and 19 meters band's. On 80m the swr it's very high. I am trying to figure out what is going on with this. But this is a very simple to made and a very good antenna for QRP. Keep the good work. 73 from CT2JAW
Very nice and informative video. I will try this one! Gongrats!
Thank you! 😊 good luck with your own antenna. I recommend to use a better core material 😉👍 73 Paul 🙋♂️
@@OM0ET I have to search and find. It is not so easy to. I already have tried something similar on a tube without a core, but it DOES NOT tune like yours!
@@batfalcononyoutube try to find it here: eu.mouser.com/Search/Refine?N=19978893
One of best videos i seen
De a71br
Oh thank you for the compliment!! 😊
Thank you , you may want to explain the use of litz wire and why you scraped the ends for those who are trying to figure out the continuity testing . Nice work om
I used a lacquered wire that I found in a bucket. I had to scratch the lacquer at the ends of each wire so that they could be further solder. And thanks for watching my video! ;-) 73
Great video, thanks, 73 W2DWL
Beautifuul work and good response in R.O.S. SWR 1.1:1....fantastic de in3ufw
Grazie Marco! Thank you for the nice comment. 73 😊
very nice!
Excellent build video Paul.
73
wd4dda
Thank you Preston! I hope that this video will help to someone ;-) and have a good day! 73 Paul
Dobrá inspirace vyrobím a vyzkouším. Akorád to bude od vrchu dolu jako sloper. Pozemek mám asi těch 20 metrů.
Very nice craftsmanship and a professional looking video. I now feel confident in building this 9:1 UnUn for my longwire antenna. Thanks and 73!
Thank you very much Gary for the nice words! I wish you good luck with your own UnUn. 73 :-)
ПРЕКРАСНО работает! US7ITC 73!
Thank you ;-)
Fine business there Paul. Thanks. KC3BXZ Joe 73
Nice video, thanks. 73 de M0OET - yes, M0OET!!! ;D
😲👍 nice! We have so similar callsigns lol... thanks for watching Brian! 😉 73. M0OET de OM0ET 😊
thank you very good video
Thank you very much my friend! ;-) Happy new year! Paul OM0ET
Thank you, once again for the video. I can imagine the joy you have derived at the result of the 'unUn" matching transformer, you made. The SWR reading was perfect. Your TX/RX set X5105 is quite remarkable. I will procure one, once my license is ready. What is your comment on X5105?
By the way, I'm on the process of making your "Random Wire Antenna matching "unUn"9:1, transformer. You inspired me. Thanks. Stay safe and 73s
Thanks for nice comment! 😊 X5105 is my the best QRP I ever had! If you will made random wire antenna, use 17.6m long wire and 9:1 UnUn 😉👍
OM0ET, thanks for the suggestion. Wilco. 73s
Super Job
Thank you very much! 😊
Thanks for doing the video in english. Very good information, Ive just made one as well. :-) (M0MPI)
Thanks! And how it works?
@@OM0ET Still testing, but looking great at the moment
I feel like Amateur radio is arts and crafts class for when you grow up! Everyone said the internet would kill HAM radio, maybe that is why I could never find someone to teach me as a kid but none the less am learning about it probably even more! 73 de K2NJO (BTW: I think you need more glue! :P)
HAMRADIO is a passion + science togheter ;-) and you can do sport also with radio in hand and hiking :-) it's a great hobby! 73 Paul
I think you would get better results with the long wire higher off the ground plus add a counterpoise, but surprisingly you got good results even with 5 watts.
Yes Gary you are right. But was late afternoon and i was hurry to quick set up antenna and do short test until darkness will come. I was there just for 30 min 😁 and had 3 QSOs with 5W. Not bad 😂 73
Paul, great video. I really enjoyed many of your assembly techniques. I am curious why you didn’t attach a ground or counterpoise.
Thank you very much Jim for watching and nice comment! ;-) Actually I wanted to use a counterpoise too and I don't know why, the signal was slightly better without counterpoise so I decided to not use it :-) hmm... 73, Paul
Great build and video. Are you able to make available the plans for this UNUN? The link in your description is offline now. Thanks
Very nice video. Just in time for me as I want to put up an LW antenna for SWL and maybe QRP in the future. Have ordered parts for the 9:1 UnUn. Thank you! 73, W9WRP
Thats really nice! I wish your antenna will perfectly work! And thanks also to VK6YSF for this diagrams 😊
Thanks for the great video, but I notice that you use a type t 6 toroid, do you think make the same thing with a FT toroid? Thank you, best '73's de IU7FKX
It is probably obvious to the majority of viewers, but it should be stated that the building of any balun or even a unUN requires the use of enameled or specially coated wire (sometimes called "magnet wire"). The use of enameled wire is so that the wires don't touch each other and short out the circuitry of the windings. There can be NO SHORTING OUT between these wires. Take some care not to scratch the enamel of the wire down to the bare copper surface ( except where soldering of the end of the wire needs to take place--- and this requires a complete removal of the coating for effective soldering purposes). If physical separation of the wires can be guaranteed for the life of this project, magnet wire may not be necessary, and uncoated wire may be used, but not recommended.
Hi Paul, Interesting video nicely done.
I'm curious about one thing, bearing in mind I'm a newbie. You gave signal reports of 59 on both calls but the S meter didn't show that. Do you have to make some adjustment to the reading? Is it just QRP convention?
Hey Paul, no, it's not only in QRP. 59 in general also means that you hear the station "clear and loud". Most of S-meters are not correctly calibrated, or not on same values anyway. Best 73, Paul OM0ET
I am new to antenna construction and grounding. During your demonstration using your tuner with the finished antenna, what would the ground have been connected to if you had used it? A stake in the earth?
Wow.. Awesome build wire Antenna..the swr test is so happy🥳
.. but Paul..the last qso .with only 5watt ..where was that station??.. was he far away from you in Kilometers?! Hi5 from P.K.NL😊
Did the same thing, with the exact same core material (yellow/white, mix 26 core material). Although not advised for this end, mine worked up to 16MHz without any great losses. The impedance goes a bit around the shot with a 450Ω resistive load, just below 50Ω (say, between 30-50Ω). I used that same core material on a smaller format (T106-26), salvaged from a PSU, due to my inexperience. It "kind of" works, at least for the low range.
Next on my plan is to experiment with a bigger core out of mix 2 iron powder, maybe a T130-2. I'm not too much concerned about power, since it will be used for QRP.
Great. Thank forshare your experiences with this construction! 😉👍 good work! 73, Paul
Thanks for the video and I did subscribe. I found and bought that 9:1 unun on eBay and bought one. One question I have why did you put the puller above your cement and bar? Do you think when wind blows or ice it will raise. Also, are you concerned about it being cover up with snow. Looking for ideas. Thanks
Electric heat is better than the flame. The flame is fine for emergency repair. I use my heat gun and get beautiful results.
You will find it better if you use three different colors of the wires as it will make it easier to get the right connection with the in and out connection .
Well done - another very good video! By the way, what length counterpoise do you use for this End-Fed and your SPX100?
This is just a long wire antenna (or random wire) and there is a grounding banana plug so it should be connected to the ground, but in this test i had not used it. And for vertical SPX100 i use 5m long counterpoise - 1/4 wave on 20m band. ;-)
Hello, thanks for sharing. Would a 9:1 UnUn improve my 150' long wire antenna (I have 4 different lengths attached to the same end fed antenna 150', 80',40', and 30')reception with my Tecsun 880?
26 mix 9:1 would be pretty lossy, I would use a 2 or 6 mix in a pinch, 61 mix ferrite core would be the best option to minimize losses.
I don't think the problem is being lossy, as 2 or 6 mixes are more lossy/less efficient. The problem is that type 26 is not suitable for RF. I did fall into the same error of using the same core material, thinking that all powdered iron is equal, and believe me, power loss is not an issue. The issue is getting above 16MHz as it rapidly starts to decrease performance. Good for AM transmission, though.
Just to summarize, you are trading off bandwidth for efficiency when you select this or that core material. I found out that, due to my mistake, type 26 is still useful in the lower frequencies. Far from ideal, of course, indeed. I wouldn't use it for 40 meters. But it is far more efficient that type 2 or 6 materials at 500KHz-4MHz.
Is there any reason why you need the heat shrink tubing - or is it just to keep the wires together?
Why not just use up the wire (divide in 3 parts) - your turns ration will always be 3:1?
Do you have any idea what the core losses are like? (if they are high enough it could give an erroneously good swr).
BTW -how are you satisfied with your X5105, can´t decide between this gadget and the FT-817ND for QRP :-(
Some how I don’t think the SWR is 1.1:1 on all the bands because when you make the first contact and watch the SWR meter it’s reading just under 1.5:1 when talking so something isn’t correct here. There’s absolutely no way a 9:1unun is going to give a flat SWR like that on all the bands unless a dummy load is connected, it’s just impossible. Even the worlds best made quality 9:1unun wouldn’t give a reading like this.
Sorry but I am not an expert or proffesional... but I am happy that I don't need tuner and I can make a couple of QRP contacts when I am outdoors. The SWR meter range is 1 to 10 so is possible that small amount (about 1.4) may looks like 1 on that scale. But no matter if 1 or 1.4 - barely seen difference in looses. ;-) 73 Paul
SWR isn‘t everything. A 50 Ohm dummy load also has 1:1. For the low bands you need very long wire. On the higher bands the radiation profile has many peaks. For qrp a Fuchs antenna works fine. Always check if the ground connection is good.
It counts as a good video only for them who do not understand the matters. I would not recommend this to anyone.
@@marcisberzins why wouldn't you?
Thank you for this great video! But if I build an UnUn 9:1 just to receive using SDR - should the ferrite core be that big? Is it enough to use small one, like the one in Nooelec 9:1 UnUn?
Thanks! 😉 Sure, for RX only you can use smaller toroid. Important thing is to use correct toroid material.
Very good antenna. Did you try with ground/counterpoise? What was the length of the radiating wire?
Good! Video. 73
Thank you! 😉 73 Paul OM0ET
@@OM0ET I'll mount it to use with qrp pixie cw 7023 khz. thank you for making project so well explained. good contacts! 73/77 PY3LTK
@@py3ltk I wish you good luck with your new antenna! And gooood DX with QRP. Enjoy and 73 😉👍
Did you get the 1.0 SWR without engaging the auto-tuner or was it engaged?
If I were to put up a shortwave dipole, each leg being 12', without a balun /transformer/impedance matcher, which band(s) should I expect to receive?
Thanks and 73!
N4ANO
Hey, nice work.. two comments, I think the pvc/shrink isolation around the core is not necessarry, it is even better to reduce the distance between core and cu wire. second, I would not use the screws of bananaplugs on tinned wires. the tin will ' float ' by the pressure of screws by time and the wire will lose its contact to the plug. would use ferrules or solder the wire directly into the plug. vy 73 de DL1LEP
Hello Paul, Thank you for your nice video. Just to avoid any misunderstanding, the measured good SWR is without using any internal ATU in your X5105, right ? Thanks - 73's. Stephane.
73👍
Hello, OM Paul -- Neat assembly job!
While I salute your re-purposing of a toroid from a PC power supply, the Micrometals 26 mix is very lossy at MF, HF, and above. Also, with only five turns on this core, the you're loading your xcvr with only 100 ohms of shunt reactance -- VK6SF used a ferrite core with 13 times as much permeability as the Micrometals 26 material. I suspect the high loss in the core contributes to the low VSWR, particularly across the 80m, 40m, 20m bands, because lossy loads will attenuate reflected power seen at the input. Nevertheless, your DX contact with Panama is very impressive!
Thank you my friend. Yes you are correct. This toroid is lossy. But the main purpose of this video was how to made this antenna. This time I didn't had better toroid, unfortunately... Thanks for watching! 😉👍 73
Hi Paul I am just starting out on ham radio. can you answer me one question please. can i use any ferrite core or does it have to be L15?
👍👍👍👍👍👍💎