Multiband EFHW Base Antenna with 49:1 UNUN (Home Made)
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- Опубликовано: 13 дек 2022
- CORRECTION: Toroid core is used FT240-43 (not 140-43)
My new home made Multiband End Fed Half Wave Antenna which has been designed mainly for 40M band (7MHz), but this antenna tunes also on 20M-15M-10M without any traps or additional coils. This antenna is made for 100W RF input power and is 19,129m long. SWR on 40M band is 1:1.1 within the phone section and less than 1:1.5 within a whole band. The 49:1 UNUN box is weather proof and all holes for components I drilled were sealed against the water. On the end of the video you can see also an extreme weather followed the next day :D
Please, if you like my video don't forget to subscribe to my channel and hit the bell button to not miss any of a new video or livestream 😉👍
Thank you for watching and 73!
Paul.
#efhw #antenna #homemade 
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Hello
the core you used looks like 240-43 so you probably wrote it wrong.
Ouh, thank you for correction! Yes you are right. It's FT240-43 toroid. I am going to write it to the video description. Thanks again ;)
Vielen Dank für den guten Bericht
I’m newish to HF and I really appreciate the neatness of your work and the detail, comprehensiveness, and brevity of your videos. This one really demystified efhw’s for me. 73
Educational 👍
Thank you so much for all the great explanation and demonstration .
Good to see 🍻
Excellent Job Paul.... 💯👍👍👍🙋♂
Super, as always ! 😊
RFG: really freaking good ... Good video. 👍
You do great work.
Nice antenna setup
A great video and a Merry Christmas to you and your family. 73, Ace🎄☃
Thank you! 😉👍 Merry Christmas and HNY 23 to you too! 🙂
very nice!
So good
Great video…..
Great video. I would be interested to see a sweep on the analyser of the antenna without the UNUN to see what its impedance is without it.
I made the unun exactly like you, and i have the antenna with 110uH coil to get 80m on short garden. I have it 7-10m high and it works really good for the city enviroment. Good for local nets on 80m and 40m, and i hear entire europe. And it's also awesome portable antena, because it gives you all bands except 160m and 6m in the 40m long variant, and hear around the globe in a quiet forest environment.
Thank you! How long in an extra wire behind the coil?
@@OM0ET +_ 2.3M
Hi Paul!
So funny to hear the QSO with EB3DIP - Xavi de Girona ... on the 10th it was 5/9+ at 7,114 in my QTH - Cascais
Now you have the antenna tuned to the 40 mts ... excellent work and thank you so much for sharing
73 / CR7BDO
Thank you Jose 😉👍 Next time QSO with you 😊 Merry Christmas! 74
@@OM0ET Certainly we will meet in the bands ... Merry Christmas / 73
You may also need a common mode choke after the 49:1 unun and another one in your shack at the end of your coax cable
Hi Elie! :) There is no any RF noise in my hamshack. Also toroid is grounded to the tower.
Great, Thanks I will try thin Multi Band Config as an Apartment Antenna, but is a sideways U config 73's
Did you consider to use a horizontal skyloop?
Mine works on all bands between 6 - 80 meter and is extremely easy to build.
It is used with a 1:4 1kw Balun. 73 de 4Z5UY
Uvažovali ste o použití horizontálneho skyloopu?
Baňa funguje na všetkých pásmach od 6 do 80 metrov a je mimoriadne jednoduchá na stavbu.
Používa sa s 1:4 1kw Balunom. 73 de 4Z5UY
Sorry, I missed what was the initial length of the wire you used, 19 meter?. 73 de OA4CKN.
Great Job....what is that white stuff under the toriod? Is that silicone?
Těch 80 m jsem vyřešil tak, že z antény udělám před balunem odbočku a připojím přímo na jednoduchý LC článek a z toho koaxiálem na anténní přepínač. Pomocí LC doladím SWR na cca 1 a mám hotové další pásmo.
I am interested in a multiband qrp EFHW like your's but want to use 450 Ohm (balanced) window line. Any ideas on how I might adapt your design to do that?
How about. diversity reception using both antennas. should be possible with that IC-7610 that I think you are using .
Bravo Paul.
Veselé Vianoce
IU5KHP Nicola
Thank you Niko and Buon Natale also to you! ;)
Why an high voltage capacitor? The high holtage should be on the wireside, not the coax side. Or do i think wrong?
I want to make an antenna for SDR receiver. Can I use just a wire?
Very nice. Why twist the primary and secondary instead of just fold back and tape them side by side closely spaced? Won’t that have less inter-winding capacitance at the higher frequencies?
I donno, maybe I could try it ;)
what is the name of the plastic box you are consstructing. please
Nice job om. I would suggest getting tower higher but that’s pretty bad wind gusts.
Thank you, I would like to but, you know, restrictions, neighbours atc...
@@OM0ET ahh ok! Anything thing that worked well for me is a 40m delta. Using 2 spiderbeam 12m poles. 75ohm stub to 50ohm coax. A great performer on 40. 20 and 15 as well.
Paul, does the white mastic not effect the toroids SWR? I once potted a perfectly good balun I made with resin and it totally ruined the performance.
No no this plastic doesn't contains carbon so it has no effect the the toroid.
Since this video is a year old and I'm late to the party.. Just wanted to toss my 2 cents in. I built an identical 9:1. In the very same weatherproof box. Tested before deploying antenna and balun. SWR all over the place a week later. That weatherproof box was full of water and ruined a good piece of coax on me. Enclosures are important do your homework cheap Amazon knock offs don't cut the mustard.
hola consulta cuanto es el largo del cable militar para poder fabricarla porfa saludos de CD3FZS
Hello, in the notes above you wrote “19,129m long”. I am trying to get an idea in my mind as to how it is possible to get that much wire. That seems to convert to almost 12 miles when putting it in the online calculator. Is it really that long?-
19m and 129cm is not that long 😃
@@OM0ET ok. That makes much more sense now. 19.129 is much shorter. The comma makes a big difference. I will keep that in mind for future reference.
Hi, one question: What is the signal that scans across the band at 21:47? I have also see this signal on my RTL-SDR when listening??
Hi, it is the Ionosonde signal used for ionosophere research.
Hi, it is the Ionosonde signal used for ionosophere research.
@@OM0ET Thank you for this info!
I have one of these with a 110uH loading coil for 80m.
great and would need only 2.5 meters after the coil to get on 80 meters
I have to try it 😉👍 I need more details how to made it
@@OM0ET There's plenty of reference on the net. I bought a cheap L/C meter to tune the coil.
@@OM0ET You will need to switch to a FT240-31 toroid to get 80m decently.
I asked you if your 270 euro loop antenna include shipping to France? 😅
No my friend, shipping to France is 46€
Is the efhw noisier then a dipole or hex-beam?
Seems that no
Wire is cut to 62 feet 9 inches ! To get 10 --40 meters with out a tuner ???