MicroVert 40M antenna - home made
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- Опубликовано: 24 июл 2024
- MicroVert antenna was developed by Jürgen Schäfer, DL7PE.
It's a small vertical for 100W. It's a short, base loaded antenna that uses the coax shield as a counterpoise.
Of course, this antenna is probably not the right choice for the DX-Hunter, but a very cheap, small and easy to build antenna and ideal for travelling and portable operation.
MicroVert calculator:
lowreal.net/2013/microvert/
MicroVert PDF document (Jürgen Schäfer, DL7PE):
www.dk5ai.de/wp-content/upload...
Very nice website about MicroVert ant. created by DK5AI:
www.dk5ai.de/projects/microvert
I will very appreciate if you will support my work and you became to my patron on Patreon ;-) / om0et
Thank you very much for watching my videos! 73 Paul OM0ET
#microvert #antenna #homemade #om0et 
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The construction actually looks a lot like a spray can, or beer can antenna. I built one myself and did not expect it to work at all, just to see it far surpassed a way more expensive commercially made vertical antenna on the 40m band. I used a 5l beer can for the build.
fantastic job 0moet thanks 73
Amazing, well built
Thank you for the impressive job! My question is that you've forgot demonstrate: how did you connect the proximal end of the coil to the internal aluminium pipe, while you can not expose it or have long enough soldering iron to reach to the screw?
Very interesting, and it seems like a nice Project, I will now look at your 2nd Video, if it's released 73's
Hello Mario, here is the 2nd video:
ruclips.net/video/5Qv3mmUQJv4/видео.html
Well done, thanks for sharing! One question: what is, and what is it for, the little black female connector (connected with the a blue wire inside the box) on the side of the box?
I really want to build this but am lost when reading the instructions and using the calculator. Anyone know of where I can find more thorough directions?
OM0ET, thank you much for the effort posting this video. May i know the Type and Specification of the Toroid Core you used in this video?
can i replace aluminum tubing just with plain insulated wire 2.5mm?tie to telescopic fishing rods?i dont 1:1 balun, can i use 4-5 ferrite bead at the end of the connector to radio?
Excellent job, Paul. Many thanks for to share this nice and interesting project.
I´ll test it "on the air" with my colleagues and with my little FT-817 pack in the next Field Radio Days.
73 & DX from Franc, EA6FS - 4X4WZ
Excelleent Franc! I hope you will enjoy this antenna. Thanks for the nice comment! I wish you good luck and many QSOs ;-) 73, Paul
Hi Paul. I am wondering if i could use this type of Antenna for my Really restricted Space. I can only mount a Vertical on my Balkony. The Hight of the Balkony is 18m over Ground so the Vertical can be 22m over Ground and in this Hight it is 1m over the Flat Roof of the House. If i go with a 7m Fiberglass Fishing Pole with a 6,5m long 1.5mm Wire and the Coil on the Bottom, could this Work ? Can i use the Metal of the Balkony as a Radial ? The Coax Radial will be only 5m outside the Building or i lay it down on the Balkony. I cant do it anywhere else. The Metal of the Balkony is solid Ground.
Hi. Please tall me where is 150mm lover coil space?? you mentioned the top 3cm on the winding. The 150mm bottom is nowhere to be found. to me it does not match swr at all. so I would ask you for help. best regards 73 from Slovenia
Very nice and well made. I think you have shown me my next antenna project for my SOTA activation's.
73's Paul
M0PLA
Thank you too 😃👍 I wish you have successfully done this antenna. Yesterday I worked 2 stations with 5W QRP with this antenna. I have got 57 and 55 reports 😉 But antenn was placed on the window only. I plan to make another video when will be this antenna on my roof 😉👍
But dasent work!!!
It works
Many thanks for this nice video, I am really gonna try this myself.
Thanks! I wish you good luck! 👍
@@OM0ET may I ask you one question? I am also gonna start with the same fishing pole. Do you count 15 cm of the lower joint section with or without the black knob?
@@ee666evil-eagle5 i don't remember, but I guess from the black knob.
Nice project, congratulations :) On my side I do have a monoband hamstick for 40 so I will not build it, and meanwhile I am on a EFHW multibander project. Not the same use.
EFHV is very good antenna. Good luck and many DXs I wish you! 73 😉👍
super video. Anténa vypadá dobre.
Ďakujem veľmi pekne 😉 a zelam šťastný nový rok! 73 Paľo.
Excellent Paul ! look forward to a follow up video ...73 Phil 2e0udx
Thank you Phil. I have to wait for better WX. I hope I will hang antenna as soon as possible. 😉👍 73 and happy Christmas!
Good afternoon, my name is Juan Carlos and I am writing to you from Santiago de Chile, I begin by thanking you for your contribution, I just saw your video and how you made the antenna, it was several years ago but I think it is ideal for me, just one question, I could see on the calculation page that I could make it longer and if the theory does not fail me, being longer than the one you manufactured would be better since it would have a longer radiant and therefore better transmission. Am I right?
Many greetingss and a big hug.
Dear Paul. What is the diameter of the fibre glass fishing pole ?
Thank you Paul. I have another question that comes up in mind mind. When looking at the antenna design link you can see a capacitance value along with the inductance coil which together they resonate at the assigned frequency. I am wondering where the capacitance value is coming from. I know you are not adding a capacitor to resonate, is it the capacitance of the aluminum tubes used; length/diameter/thickness', etc...? KJ7YSW
It comes maybe from the type of feedline connection, because end of the feedline connected to the coil has braid not connected to anywhere... it's my guess only
I forgot, Juan Carlos again, what happens if I leave the longest coaxial cable and to get to the radio room I need 14 meters, will that affect?
I don't see in the calculator that I can regulate this parameter.
...73
Reminds me of the Isotron antenna basically a coil with a capacitor hat.... get it up high enough l am sure it would work... not sure if there’s some cleaver physics behind this type of antenna or it’s just a 50 ohm dummy load.
Hi Dave, yes it seem so. Probably this antenna was developed on Isotron origin. My MicroVert will be placed about 35m above the ground level on top of my house so I hope it will be ok. Today i had one QSO with my QRP 5W transceiver and this antenna placed on the window. :-) 73
Hello there, I've just finished and tested the antenna. It's quite simple and cheap to do. But I think it's an antenna for "no way" situations or limited (or emergency) field operations. There's no comparison even to a simple Ribakov antenna that I currently use and runs (matched) from 80 to 6 meters. Anyway it's a good suggestion and a useful exercise. 73
Great! 👍 What is your experience and test results please?
The antenna was made with "on hand" stuff (i.e. PVC pipe 25mm, aluminum 20 and 16mm for tuning). The RF choke was made on a 150mm ferrite rod. The radiation pattern seems to be a little bit flat, ideal for very short loops. Signals are too weak, generally 15-20db (or maybe more) lower than my vertical antenna. Anyway, some modification on the radiator lenght Is now in my mind. Bye
@@pietrogazzera5733 Thank you! What is the SWR? ;-)
The best SWR is 1.6/1.7 in the middle of the 40 MT band. Depending on the location of the antenna and the placement of the "counterpoise". Sometimes, 1.2/1.3
@@pietrogazzera5733 yes I had the same, depends on the location of the counterpoise and radiator. I had no other way to work on 40m so this Microvert helped me a lot 😉👍 But now I use 42m lond EndFed antenna. So best 73 and good luck!
Thank you Paul for the inspiring video. I have a short question; the Coax cable length with your design is 8 meter or so, if you were have to use a longer cable would it change anything? I can imagine a shorter cable would be a no no, but a longer?
It's calculated for it's resonance
@@OM0ET does it mean it works as a radial?
Muestren el programa de calculo de la entera
micro vert
Very nice
Hello Paul,
Watching your video, I've decided to build one by myself. I've used 1.05m long 18mm in diameter aluminum pipe, 50mm diameter PVC pipe on which I've coiled 29 turns of 1.1mm enameled copper wire. Coax cable length is 8.2m. Balun is made of 2 stacked toroids (small ones, 43 mix) with 7+6 turns of RG174. All calculations have been done using Micro Vert online calculator.
ISSUE: 1) I can't lower SWR below 2.5
2) Very narrow bandwidth, 30 kHz (more less as I was expecting)
Do you maybe have some advice how to improve performances?
Regards,
73 de YU4OWL
Hello Vaso, here 3:31 you can see the diagram of my construction. I used 2 sections of aluminium tubes 1095mm + 1202mm long + 376mm long fiberglass tube with coil. Total lenght of antenna is max. 2403mm. The coil has 69 turns of 1mm wire. Radial lenght is 8,11m of RG58 coax with balun made of RG174. Antenna is very sensitive on radial location. Try to place radial to another position and check SWR again. Also check if has your antenna the same lenght. I had a lot shorten of this lenght until I have got optimal resonance. Now it's about 1,6m long I think, not sure, but it depends on antenna location. Don't know now what AL tubes diameter was used because antenna is still on the roof :-) and working great. 73 Paul
Great !
No muestran el programa de calculo para antena microver
This is very reminiscent of the miraculous Partridge "Joystick" antenna of the 1970s...
Nice job , 73 best dx
Hello dear Paul, thank you very much for this very interesting Video about your antenna project micro vert and that you share your knowlege. I think it will be my next DIY projwct. All the Best for you 73 de Ralph DB 9 FQ C 31 KM
Thank you also for watching this video. I still use this antenna during this winter. We had a storms and snowing, freezing, but this antenna still works :-D I have a plenty contacts with it on 40M. It is a good antenna i think. Especially for portable use. Once was a problem with SWR when was a icy raining and the icy crust has been created on this antenna, the SWR flew away :-D 73 and good luck with your project. Websites, sources you can find in the video description. Paul OM0ET
If i use a tuner will i be able to cover other bands with this antenna ?
No, i don't think so. It's in-band tuned antenna with the coil.
It pretty much looks like a EFHWD, with one coax leg and and the second as shortened one (coil loading)
Hmm, I don't know 😀 Patrick. EndFed antenna needs 9:1 UnUn but this antenna uses current choke only on the end of radial from coax 😉 70
73 Paul
Not really, I build several based on a ARRL Handbook design. I had a coax coil to block RF common current mode, 1/4L of open coax (thread not connected in the centre of the physical dipole) extended with 1/4L of wire. It looks like this o======--------- On the other hand 9:1 balun are not suited for a resonant dipole, your must use a resonant tuned circuit (auto transformer + parallel capacitor) as the wire impedance is about 4.5kOhm. Anyway, I'd recommend to put your coax run outside of the building as much as possible. See you on the air ! 73's, Patrick
@@newpatrick8838 Thank you ;-)
@@newpatrick8838 www.dk5ai.de/projects/microvert
🤔🤔
Hi Paul! Have you had a chance to compare this MicroVert and the Magnetic Loop? If yes, then which one has better performance? I suspect that the winner should be the ML, but it would be great to know this from one having practical experience with BOTH antennas? Do you plan to compare them in the real time? Please! De Sergey, UT8UU
Hi Sergey! It's a great idea. But this time I do not have MLA for 40m. The 7MHz antenna must have at least 2m diameter to be a good performance on this band. Maybe once I'll make one just for this comparing video ;-)
@@OM0ET hi! Nice to hear I was able to give you a great idea. Keep going!
Nice
What is with noise? I have big problem with noise under 14mhz on my location... S8 to S9++...
Hello Drago! The noise problem is very common in cities environments below the 14MHz band. I dont have any antenna for 40 and 80m bands so i do not know what background noise will be here. I still wait for better weather to have put this MicroVert vertical on my roof. I plan to make another video how will it work in real conditions so then you will see my background noise level. Verticals receive more static noise globally so I do not expect it will be quiet ;-)
Hi paul, i would make this antenna and i have a stupid question.
Hi have a couple of anodized alluminium pipes. It can be a problem for the capacity for the radiator elements?
You think i must remove this anodized layer on the surface of tubes?
Thanks!, IU6KVT
Hello Simone! Hmm it's hard to say. You should try it then see. Sorry but i don't know answer to this question. 73
@@OM0ET OM0ET I have hard read on original document of DL7PE and he say that the adjustment tube (inside the radiator) must be non-galvanic alloy but no mentions on the radiator itself. I will try however to remove the galvanic layer and we'll se 👍🏻 Thanks Paul, 73
@@simone2601 Yes, and then you could share the results with us ;) Thanks! Good luck!
Do you sell these please?
Nice antenna,may i ask what number of toroid core?
You should use FT-140-43
What about radials? Doesn't it need radials?
It has radial. 8m long coax is radial. 😉
How was the testing? What is the result?
ruclips.net/video/5Qv3mmUQJv4/видео.html
muchas gracis por la informacion sera de mucha utilidad en mis experimentos , te saluda cd3fzs
pdf won't download
THis is not a just MICRO Vertical antenna. It consist per scheme of 2 parts: First one: is 2.5 Aluminimum tube and a second one part is 8.1m of COAX and to be more exact outer braid of coax.
So if put this antenna vertically it should ~11m tall. WIth same success we may just put it horizontally at the height of 0.15Lambda of working frequency above the ground and using simple RF inidicator (10-20 turns of wire on ferrite braid, HF diode + MV meter) and moving along the 8.1m part you will see different current spikes. in such scenario it would behaves as assymetric dipole.
So in reality in this antenna 8.11m coax barid is main part of RF emission .
It is not my idea but DL2KQ wrote about this antenna in his book part of Myth Anetnnas (Myth here is that on;y 2.5m Vertical is antenna ). I only added the way to check the statement and offered the way to work this thing efficeintly by bring it as 11m tall antenna.
Have luck with this .
Thank you for this very informative comment my friend and 73. Paul 😉👍
Excellent job - Bst73de i4oqa.
Thank you 😊
Programa de calculo para antena microvert geurgen
what is the size and type of the torroid?
Hello. I don't know. I've got it as a gift, but Ferrite toroid mix 43 would be very good for the current chokes ;-) 73, Paul
OM0ET how about the diameter of the fiberglass tube? Thanks
@@revadan Diameter is variable because of the conus shape, but obviously around 18 or 19mm. I used this fishing rod 300cm long: www.henrystackleshop.com/poles/5367-okuma-g-force-tele-pole-whip.html
@@OM0ET another question mate.. is the top smaller tube insulated from the radiator? mine has contact between the two tube.. and noticed that my impedance is very high like 90ohms.. my swr will not go down from 1.6.. scratching my head..
@@revadan it was not insulated.
Barrie Meyer
Please ring . Muriel
thank you, de YC0HLE
Transmitting FM at 7 mhz is a no no
excellent video! congrats!. vy 73 fredy hb0bb
Thank you Fredy! Watch also part two with testing 😉
A plain old resonant wire dipole will be far superior.
I know. This is just experimental project and will not replace my dipole antenna. Should be great solution for SOTA and portable usage.
A great solution, how? Explain on which terms, using logic. My opinion is that it's a poor antenna that takes up more space and is more inconvenient to transport than a thin-wire dipole which could be stuffed into any gap. Maybe you might do an on-air comparison video - your viewers will enjoy that.
@@SteveWrightNZ look not all portable or SOTA places have a trees or high points to hang on the end of wires. Just a rocks on the ground and that's all. Yes you can erect shortened verical and nothing else or am I wrong?
@@OM0ET Well, if you have some pole-like thing to point upwards, would you rather it be that vertical antenna, or carbon telescopic pole with a dipole hanging from it? Do the on-air comparison for us - it'd be interesting!
@@SteveWrightNZ Each telescopic pole for instance 5m long, will be in collapsed state (it's about 140cm) almost similar long like this MicroVert antenna. But I never said that wire antenna will work better! It's no doubt about this.
Maybe, I will make small comparison, even I don't like it because it's not so easy especially on HF due to QSB, signal phase, polarisation and so on. Many people have many arguments why is comparison poor.
Interesting video. Thanks for the info! KO4GMG
I thank you for watching! 😉👍 73
You pronouns wrong, it's heat shrink, not heat ring
What a waste of time..26min video for aprox. 5min real interesting and informative content...so you can place 6-7 commercials. Thats not ham spirit even the good information in it. 73 also
Look, you still have a choice to stop video always you want or use AdBlock... Sorry but I can't find any other words to answer of your comment. Have a nice day. 73 Paul OM0ET ;-)
@@OM0ET Hi P, you can't please them all. 73's JD.
@@ON8EI ...exactly :-D 73 Paul
Not everyone shares your viewpoint Lucky Llou. I enjoyed the thoroughness of this video.
@@atticman2011 Watching "MicroVert 40M antenna - home made" video published on December 21, 2018 by OM0ET. You, Lucky Llou, are the author of this thread. How can you not know which video you gave a negative comment.