Multiband EFHW Base Antenna with 49:1 UNUN (Home Made)

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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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Опубликовано:

13 дек 2022

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Комментарии : 58

@SP2NW Год назад

Hello the core you used looks like 240-43 so you probably wrote it wrong.

@OM0ET Год назад

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 ;)

@WheezyE Год назад

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

@KlausSchleiferDE 20 дней назад

Vielen Dank für den guten Bericht

@ae1tpa92gwtom2 Год назад

Super, as always ! 😊

@PhilipHounsham 5 месяцев назад

Educational 👍 Thank you so much for all the great explanation and demonstration . Good to see 🍻

@DK5ONV Год назад

Excellent Job Paul.... 💯👍👍👍🙋‍♂

@jamess1787 Год назад

RFG: really freaking good ... Good video. 👍

@markstump7079 Год назад

You do great work.

@eliekadi_OD5KU_KU5OD Год назад

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

@OM0ET Год назад

Hi Elie! :) There is no any RF noise in my hamshack. Also toroid is grounded to the tower.

@harryszwergstatt2879 Год назад

Nice antenna setup

@Yuehanlad Год назад

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.

@acestudioscouk-Ace-G0ACE Год назад

A great video and a Merry Christmas to you and your family. 73, Ace🎄☃

@OM0ET Год назад

Thank you! 😉👍 Merry Christmas and HNY 23 to you too! 🙂

@sparky5860 Год назад

Great video…..

@mrradio2187 5 месяцев назад

very nice!

@R2FDI Год назад

So good

@HyperMAX9001 Год назад

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.

@OM0ET Год назад

Thank you! How long in an extra wire behind the coil?

@lmy5pence481 Год назад

@@OM0ET +_ 2.3M

@MarioVe2 11 месяцев назад

Great, Thanks I will try thin Multi Band Config as an Apartment Antenna, but is a sideways U config 73's

@miranovak8098 Год назад

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.

@joseneves2822 Год назад

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

@OM0ET Год назад

Thank you Jose 😉👍 Next time QSO with you 😊 Merry Christmas! 74

@joseneves2822 Год назад

@@OM0ET Certainly we will meet in the bands ... Merry Christmas / 73

@raullibunao3367 3 месяца назад

Great Job....what is that white stuff under the toriod? Is that silicone?

@neira.francisco Год назад

Sorry, I missed what was the initial length of the wire you used, 19 meter?. 73 de OA4CKN.

@fubarsnafu4994 19 часов назад

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.

@massoud999 Год назад

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

@kbell101 Год назад

How about. diversity reception using both antennas. should be possible with that IC-7610 that I think you are using .

@larspregge6420 Год назад

Why an high voltage capacitor? The high holtage should be on the wireside, not the coax side. Or do i think wrong?

@GMT_400 3 месяца назад

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?

@OM0ET 3 месяца назад

I donno, maybe I could try it ;)

@dannystephenson4957 Год назад

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.

@OM0ET Год назад

No no this plastic doesn't contains carbon so it has no effect the the toroid.

@kd5txo Месяц назад

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?

@JayN4GO Год назад

Nice job om. I would suggest getting tower higher but that’s pretty bad wind gusts.

@OM0ET Год назад

Thank you, I would like to but, you know, restrictions, neighbours atc...

@JayN4GO Год назад

@@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.

@wbrown310 Год назад

I want to make an antenna for SDR receiver. Can I use just a wire?

@WOLFIE1965 Год назад

what is the name of the plastic box you are consstructing. please

@bryantwalley 10 месяцев назад

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?-

@OM0ET 10 месяцев назад

19m and 129cm is not that long 😃

@bryantwalley 10 месяцев назад

@@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.