ฝัง
- เผยแพร่เมื่อ 14 ก.ย. 2018
- I bring this home made random wire antenna outdoors and set it up in the garden during the typical windy autumn day here in Slovakia. Let's try this antenna with a small QRP rig Xiegu X5105. The wind noise was amazing this day - it's a relax for me 😁👍
I recorded 2 QSOs with 4Z1KD/P and OM7CF.
Part 2: • Modificated RANDOM WIR...
Part 1: • RANDOM WIRE ANTENNA wi...
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Thank you very much for watching my videos! 73 Paul OM0ET - วิทยาศาสตร์และเทคโนโลยี
Thanks a lot Paul👍I have watched all 3 parts and learned what I needed... and certainly will build one.
It works really well Paul! This has helped me and I will now build one, thank-you.
Excellent video tutorials and expertly edited video. Thank you!
Thanks for the video!
Fantastic I did build 9.1 to see what it like from 49.1 surprised works very well I did same thing about 2 ground wire I use about 25 feet counterpoint it was left over from the spool the swr are bit hi on some bands I will make adjustments on the TX wire. Great video.
Antenna worked really well. Nice Job on the mods. 73"s
I had couple more QSOs behind the scenes also. Thank you very much for watching! 😊
good job!
Tnx for the QSO de 4Z1KD/P :)
Oh Gil, thank you for stopping by! Thank you for give me chance to test my antenna on 20m 😉 As you can see you was very strong in here. Have a nice day. 73
Beautiful nature :)
Fantastic Paul!
A keyring Unun. Nice and small and easy to attach in the field.
Definitely making one to prepare for summer operating.
I will use a steel tent peg for the ground end.
73's!
Thank you Adam. It's very lightweight antenna. If you want to see more about used plastic box so link is in the video description. 😉 Good luck with your own antenna! 73 PS: i wish i had QSO with VK and QRP in the future 😊
Suspended quite low, it works even better (or the same results) than my EFHW: O THNX for good idea !
worked great that antenna Paul, great video 73's M3WUN
Thank you Ian 😊
Videa výborná, díky za ně. Pravidelně odebírám a opět dávám like.
Dakujem Jirko! 😉👍 To ma velmi velmi tesi! Dufam ze dalsie videa tiez nesklamu! 73
Great project. I was licensed over 25 years ago and wanted to build a random wire then, but no one did them then and information was hard to come by before the internet. I stepped away from the hobby after five years in it, but am getting back in and am going to put up one when I get a rig. My how times change! Random wires are all the rage now. I knew you would do a lot better with the counterpoise. I wish I could do QRP but it would be no good at my home. I am in a narrow deep valley, and while I have room for a wire over 100 meters long, its all in the valley and under dense hardwood trees. Power is a must and even then it isn't easy. By the way Slovakia looks beautiful and I also love chickens and had some pet ones as a teen age boy. 73 N8PEF
Thank you for the nice comment Will :-) I like all kind animals and flora. Generally I feel in the nature like home. I like that birds singing and wind sound in the trees. That is so good relax, especially when I have my small radio in the bag and I can set the antenna and runing QRP contacts. I enjoy it more then QRV at home :-) The 9:1UnUn and random wire antenna is very easy to made. I am working now on very small QRP version which you can see on my latest videos. I wish you have fun with hamradio hobby! 73 Paul
@@OM0ET Dear Friend: I enjoyed your videos. When you made your UnUn, is very easy to take a 1 to 4 derivation and a switch to select 1 to 4 or 1 to 9. This trick allow to tune a better SWR in the low bands. To use with less than 10 watts, you can use any sort of core; even e piece of broken AM radio ferrite with 10 trifilar turns in series.
PS: If you laid the counterpoise wire oposed to the antenna, you magnify the dipolar moment -an the capture area- and obtain perhaps 3 dB more signal (About 1/2 S).
Thanks for sharing your instructive experiments. LU1AR
@@edgardomaffia5356 thanks! Could you send me the schematic diagram how to do it please? It will be very interesting 😉👍 73 Paul
Excellant
Nice antenna Paul, congrats for this neat job ! 73, ha7wx chris
Oh thank you very much! 😊
Either longer ground wire or counterpoise, or location changed SWR on 80 meters. Antenna height has serious affect too. Thanks for the foolowup videos, #2 and #3. 73 KB8AMZ
Thanks for watching them all Terry! 😉👍
I did that antenna yesterday. I will test it on Saturday :) I had UNUN 9: 1, so it will be compared to EFHW
th-cam.com/video/EAUZH5V6fD8/w-d-xo.html
I have not done many QSO's because my battery has died , but I will still test :)
Fantastická práca, vďaka 73 de 4Z5UY
Ďakujem! 😊
Dobry deń pozdrowienia z Polski
Czesc! 😉👍
Paul, just a word on Technique...Shift OFF any Active Freq before you tune...Thats a Great SET UP
Beautiful workmanship... You should sell that antenna system on Ebay... I'd buy one.
Thank you Jim! Maybe I will do 😉👍
Paul, in a previous video you made allowance for at least two ferrite chokes on the coax to your radio. I notice in this video that you do not use them. Did they prove unnecessary or did the coiled coax near your transceiver act as an RF choke? Thanks for the field test video. MikeinMinnesota N0WDM
Hello Mike. If I use good counterpoise wire I obviously use a ferrite chokes, but if I don't have a counterpoise I use coax feedline like a counterpoise. Then I don't use ferrites. In this video I use a counterpoise but I also didn't used ferrites. Hmm I really don't know why 🤔 maybe I didn't noticed that 😄 73 Paul
Buena antena
Hi, keep with your videos Paul, as a beginner in ham radio ( but I have experience in electronics) I find your ideas help me so much! Compared to the spx100 whip, maybe the end feed wire performs better? Even so I plan to buy a spx100 for my patio where a long wire will be a bit impractical. What do you think? 73!
Well, that's a good question :-) Hmm actually i don't know to answer you. But it should be a good topic to make another video with comparison SPX-100 vs. Long Wire ;-) What do you think? And thanks for the nice comment btw. Vertical is more versatile antenna but you need to adjust while change the band. Long Wire is bigger but you dont need adjusting anything :-). Sometimes is hard to decide hi :-) 73
I was wondering if the chickens helped to lower the swr with their scratching?? I’ve viewed your videos and was inspired to build the unun!! I just finished today in fact. I’ll try it on my qrp rig when the metre of snow disappears from my back yard. Thank you.
Very well! Please let me know how it works. 😉👍
Great job, Need to know the balun inside the box ???
Thank you! You can see how to made this UnUn here: th-cam.com/video/2M9Aep6DHz8/w-d-xo.html
G'day Paul, I'm wondering about your black wire going up the tree it seem to have a lot stress on the box and in time will come out and lose your connect to the box. On the black wire, the long wire, does it have any marking of what type it is? 75 OHMS or 50 OHMS? 73 de Dennis vk4oc.
Hi Dennis. The black long wire is 2mm thick with PVC isolation. Coaxial cable is a common RG58 50ohm. The pressure is ok. 73
He needs a stress loop on the wire end ...
Highly restricted due to space and HOA OK qrp great but can this design handle 45 watts? Also is there a minimum height off ground. Can go 18 feet to 20 feet. I do not have a 20 meter straight run but can make an horizontal Vee here is too hot most year for field activities.
Yes you can run 50W. You can try inv.V design it could work OK as well.
Effectively an OCF antenna with the toroid, yes?
It's a random length. It cannot be resonant on any frequency you want to use.
I really enjoy your videos, Paul. Keep up the great work! Oh, by the way, is that an IC-7610 image that is now on your banner? 73! de WX0V
Hi Scott! Oh thanks for your stopping by. I like your videos! Yes, i became to be a proud owner of the ICOM 7610 and you helped me make the decision to buy the ICOM 7610 after watching your videos Scott :-D Thank you! Hi
@@OM0ET I hope you enjoy your new rig. Take care and keep the videos coming...73! de WX0V
@@SuburbanDXing yes i enjoy it. It was my dream to have this rig at home. Receiver is amazing! Just one dislike - the time delay on the MONITOR audio signal in my earphones. That's why i don't use it often. And the SWR plot is missing compare to 7300.
Great work, thanks for sharing! What type of RF filter do you use on the feed line. You mentioned it but it was not visible in the video. 73 de sm0wuc
Thanks. Yes thats right. Its was not yet in the video. I use the ferrit clamp chokes but another toroid would be better i suppose. In this video i used couple turns of coax feed line 😊
@@OM0ET Great, thanks! I have RF issues with a similar design. I'll try wrapping the coax around a toroid and see if that's enough. 73
Já už tě X měsíců sleduju, zbastlil jsem si několik ultra-light loop antén, myslel jsem, že jsi odněkud z Anglie nebo tak a ty tady začneš hovoriť po Slovensky. Tak to sem se fakt zasmál :) super
Nuž svet je malý 😃 Ďakujem za sledovanie mojich videí! 😉👍 Dúfam že ti tie antény k spokojnosti fungujú! 73, Paľo OM0ET
@@OM0ET Tak tak... :) Antény jsou skvělý, koncept super, ale mám ji v bytě, takže mám v podstatě příjem jen směr okno. Vše podél baráku je logicky hluché. Moc bytů, moc kabelů, prostě odstíněno. Navíc si sousedé koupili lednici, která mi jednou za půl hodiny totálně zaruší 40M pásmo harmonickým. Prostě nějaký šmejd, ale nechci se kvůli tomu dávat do sporu.
Nejlépe mi zatím fungovalo balun 9:1 a drát na strom z okna, to je jedna stanice vedle druhé, i přes den. Ale to víš, z paneláku to není zrovna nenápadný design, takže zatím nadále používám loop tvého konceptu :) btw, zatím stále jen RX na SDR a Upconverter. 73 Paľo
btw, hodně mě překvapil přijímač TECSUN PL-330. I v bytě mám celkem kvalitní poslech KV, jen s teleskopem, který má na sobě. Pokud s Tecsunem vylezu někam na pole, tak je to doslova jedna silná stanice vedle druhý, jen na ten základní teleskop. Vůbec nechápu, jak se jim to podařilo takhle navrhnout, když anténa nemusí mít dvacet metrů. Stejně tak skvěle fungují střední i dlouhé vlny. Tam například s UpConvertorem nemám prakticky šanci, kdežto s Tecsunem i z bytu na dlouhé vlny přijímám radio majáky z opravdu velkých vzdáleností. Prostě jen tak, na gauči... :)
Ano je to tak. Ja mam PL600 a funguje rovnako 👍
Nuz 37 rokov som zil v panelaku takze ti plne rozumiem. Je to tak. Nuz nic nedokaze nahradit externu antenu, to darmo. A susedia, o tom ani nehovorim...
Great videos series Paul, Thank you for sharing. Question, I wonder if you would get same results using an FT140-43 toroid. Please let me know your thoughts.
Noel - W2MSA
Hi Noel! Thnank you for the kind words! Sorry but i bever tryed this UnUn with FT140-43 toroid, but officially it should work better on the shorter bands (12, 10m). In this project was my priority to made cheap and small antenna for 80, 40 and 20m bands and seems that this toroid work well there :-) 73 Paul
@@OM0ET I think you'd get much better results with the type 43 ferrite. The yellow and white core you have chosen has HF loss, because it is designed for noise suppression in SMPS designs. Computers are full of them! It can reduce your output power quite a lot - not a good thing on QRP.
@@hectorpascal yes I agree with you but I didn't had a better material. It was just an experimental made antenna 😉 better this than nothing. 😁 Small and common toroid to get to everyone. Easy and quick to build. 73 Paul
This Yellow-White toroid from PSU get warm with my TRX @50W. I tried with red toroid T130-2 ant it works fine. I have some DX (Japan, China) with 10W FT8 yesterday.
Thank you for the video!
Valeri - LZ1WTA
73!
Does it make a difference if you ground the shield side of the line?
Why not run it parallel with the center coax line like a dipole but folded up?
I'm guessing because dc isn't grounded like the return in a home circuit?
How long is the Coax cable attached to the 9:1 unun? Is that acting like a choke? Is it necessary to have such a long coax?
In this case it's acting as a counterpoise. There is no choke on it.
@@OM0ET Thank you Paul!
Felicidades Paul OM0ET exelente antena y veo que trabaja muy bien en varias bandas. una pregunta el largo del cable de la otra tierra larga que tiras en el pasto de cuantos metros mide saludos de XE2ROM 73s
Gracias por ver mis videos y bonito comentario :-) 73 Paul.
Paul
I like the case for your radio. I got my X5105 last month and would like to get a case like your.
Is it made for your radio or just a case for something else?
Always enjoy your videos.
Best to you and yours in 2019
73
wd4dda
If you mean the black textile case so it is original case of my general coverage receiver Tecsun PL-600 and I realized that it perfectly fit on X5105 :-D so I have very glad to use it to protect radio body from the surface and dust. 73
When you were using it without any grounding wire or earth at all in part 1 you got much better SWR on 80m?
Yes I think so, but maybe wire lenght was not correct :-)
@@OM0ET I see in a comment that you say 17.5 meter was a good length . In the video you are at 20 meter . What did the 17.5 meter wire change ?
@@dback4430 udel.edu/~mm/ham/randomWire/#:~:text=You%20also%20want%20the%20antenna,least%2010m%20or%2033'%20long.
Wire size 1,5 mm and 20 meter. Its ok. But what kind of wire do you use?
Very good lenght is 17,6m and I use braided copper wire.
nice results Paul 73 de Erwin HB9GNK
Thank you very much! QRP is beautiful job 😀👍 73
👍73 ют
Paul can I use this antenna for reception only in all hf bands , will I have any problems if no transmitting and second question if I put this antenna as a base station antenna will I have a problem ? And as base antenna only receiving again
Yes of course you can use it for all HF bands as a receiving antenna. This is much better than any dipole, because the random wire antenna is non-resonant antenna what means that you will receive signals on all HF frequencies with no attenuation out of resonant frequency like is normally on the dipoles. If you don't have a HAM radio licence you can still use any kind of antenna, but you can't never transmit with it! 😉👍
Earthing made zero different to mine when I tried this. No change at all.
What is dimension of counterpoise?
It should be at least 1/4 lambda of the used band
Where I can order this antenna?
Hello 🙋♂️ write me on email hamradioslovakia@gmail.com
What torroid do you use please. Excellent work
Thanks! Its from an old power supply unit but I recommend to use a 43 material
Thanx for that I have watched a lot of. Your videos as I love to experiment with antennas. I loved the micro vert :)
@@ukm6yik69 Thanks for watching 😉👍 Yes you can try to build one 😉
A simple dipole would be much easier ,not sure if bad wx may effect the swr
Yes but dipole is monobander and also not feed ond the end 😉
Why did you use 2 ground wires
One is the ground wire, second one is a counterpoise.
Excellent Job. Thanks for sharing. 73. yv5emg
Thank you very much for watching! 😊
Bardzo dobry projekt. Fajnie to działa dlatego chcę zrobić taką samą. Nie wiem która jest lepsza , pierwsza czy druga. Fajnie by było gdybym mógł poznać szczegóły jak zrobić transformator. Jego dokładne wymiary oraz drutu , żeby udało się zrobić tak samo dobrze.
Veľmi dobrý dizajn. Funguje to skvele, pretože chcem robiť to isté. Neviem, čo je lepšie, prvé alebo druhé. Bolo by pekné, keby som sa dozvedel podrobnosti o tom, ako urobiť transformátor. Jeho presné rozmery a drôt, aby mohol robiť rovnako dobre.
Ďakujem! Obidve konštrukcie sú s rovnakým toroidom, len som vymenil plastovú krabicu a doplnil som nejaké háčiky. V prvom videu a v priloženom linku je presný návod ako to vyrobiť. ;-) 73 Paul OM0ET
Dziękuję! Obie konstrukcje są tym samym toroidem, po prostu zastąpiłem plastikowe pudełko i dodałem kilka haczyków. Pierwsze wideo i dołączona linia to dokładne instrukcje, jak to zrobić. ;-) 73 Paul OM0ET
Mám toroid 32,5x22,5x12,6 Neviem, čo ste použili. Presne to isté, ako to dáva VK6YSF a je dĺžka drôtu rovnaká ako v dizajne? Chcem použiť drôt s elektrickým káblom 1,5 mm2 (1,1 mm). Plechovka nie je dôležitá.
Pozdravuje Paweła z Koszalin
(ľutujem, ale používam prekladač google)
Použil som žltý toroid z nefunkčného PC zdroja ktorý sa nachádza v jeho primárnej časti. Drôt som použil asi 0,5mm.
this one : and a 1:9 unun - mine was around 38m no radials did zl30mdg in 2009 as the longest ,less than 20 watt
a friend did sam on 19,7 m both from SM7 area
www.hamuniverse.com/slopinginvl.html
Nice but im skeptical of quality of the ground even with qrp rigs. A six feet deep copper rod and a secure connection is my minimal ground.
I tried this antenna and it was better with NO ground and no counterpoise.
Why is so much effort to suspend the balun off the ground like that but the antenna is laying on the ground?
Ground wire is not optional in this setup, because your earth ground is really BAD. Antenna is too low too.
It's not a base setup as you can see. When you run SOTA you will not have any more options, high or good ground. It's true what you say but it's just a theory. More important is portability and the final results - QRP contacts and that I had... 😉 73
Mine works much better with no counterpoise and no ground.
The terrible internal speaker with 100% of distortions :-)
Speaker is very small, unfortunately 😒