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

Рет қаралды 41,102

Жыл бұрын

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

Пікірлер: 56

@SP2NW Жыл бұрын

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

@OM0ET Жыл бұрын

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 Жыл бұрын

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

@PhilipHounsham 4 ай бұрын

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

@DK5ONV Жыл бұрын

Excellent Job Paul.... 💯👍👍👍🙋‍♂

@acestudioscouk-Ace-G0ACE Жыл бұрын

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

@OM0ET Жыл бұрын

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

@jamess1787 Жыл бұрын

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

@markstump7079 Жыл бұрын

You do great work.

@ae1tpa92gwtom2 Жыл бұрын

Super, as always ! 😊

@eliekadi_OD5KU_KU5OD Жыл бұрын

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 Жыл бұрын

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

@Yuehanlad 11 ай бұрын

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.

@harryszwergstatt2879 Жыл бұрын

Nice antenna setup

@qerqo4-fikgux-govvEx Жыл бұрын

So good

@sparky5860 Жыл бұрын

Great video…..

@joseneves2822 Жыл бұрын

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 Жыл бұрын

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

@joseneves2822 Жыл бұрын

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

@mrradio2187 4 ай бұрын

very nice!

@HyperMAX9001 Жыл бұрын

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 Жыл бұрын

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

@lmy5pence481 Жыл бұрын

@@OM0ET +_ 2.3M

@MarioVe2 10 ай бұрын

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

@neira.francisco Жыл бұрын

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

@massoud999 Жыл бұрын

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

@raullibunao3367 2 ай бұрын

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

@JayN4GO Жыл бұрын

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

@OM0ET Жыл бұрын

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

@JayN4GO Жыл бұрын

@@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.

@kbell101 Жыл бұрын

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

@dannystephenson4957 Жыл бұрын

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 Жыл бұрын

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

@GMT_400 Ай бұрын

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 Ай бұрын

I donno, maybe I could try it ;)

@iu5khp Жыл бұрын

Bravo Paul. Veselé Vianoce IU5KHP Nicola

@OM0ET Жыл бұрын

Thank you Niko and Buon Natale also to you! ;)

@miranovak8098 Жыл бұрын

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.

@kd5txo 24 күн бұрын

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?

@larspregge6420 10 ай бұрын

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

@bryantwalley 9 ай бұрын

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 9 ай бұрын

19m and 129cm is not that long 😃

@bryantwalley 9 ай бұрын

@@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.

@wbrown310 Жыл бұрын

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

@WOLFIE1965 Жыл бұрын

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

@paul_laws Жыл бұрын

I have one of these with a 110uH loading coil for 80m.

@eliekadi_OD5KU_KU5OD Жыл бұрын

great and would need only 2.5 meters after the coil to get on 80 meters

@OM0ET Жыл бұрын

I have to try it 😉👍 I need more details how to made it

@paul_laws Жыл бұрын

@@OM0ET There's plenty of reference on the net. I bought a cheap L/C meter to tune the coil.

@Carries338Lapua Жыл бұрын

@@OM0ET You will need to switch to a FT240-31 toroid to get 80m decently.

@soldadodecristo9254 11 ай бұрын

hola consulta cuanto es el largo del cable militar para poder fabricarla porfa saludos de CD3FZS

@RosssRoyce Жыл бұрын

I asked you if your 270 euro loop antenna include shipping to France? 😅

@OM0ET Жыл бұрын

No my friend, shipping to France is 46€

@jefftylicki1979 Жыл бұрын

Is the efhw noisier then a dipole or hex-beam?

@OM0ET Жыл бұрын

Seems that no

@revbikerbigd8664 6 ай бұрын

Wire is cut to 62 feet 9 inches ! To get 10 --40 meters with out a tuner ???