Jiří ďakujem za Tvoju podporu a sledovanie videí! 🙂 Som rád ak tie videá niekomu pomôžu! 👋😉 73, Paľo.

Thank you for an advice and for your very nice comment! :) Best 73! Paul

Congratulations for a good job! 👏😉 Best 73! Paul

Oh, I love your callsign btw. ;) RARE and otherworldly.

Thank you Joshua for your kindness and the nice comment! It's my pleasure you like my videos 😊 Best 73 from Slovakia! Paul

Thank you my friend! ;) 73

Thank you! ;) 73 de Paul

Thank you Scott ;-) 73! Paul.

Thank you! 🙂👍

Thank you for watching this video Miguel! 😉👍

Hello Albert! :) Thank you for watching ad greetings from Slovakia! 73, Paul :)

Thanks Chris for your support! ;) Yes, my words ;) This is the super strong glue Mamut: www.denbraven.sk/produkt/mamut-glue-high-tack/ Very good glue for similar purposes. Thanks for watching and Happy new year 2021! 73, Paul OM0ET

Grounding is always just the positive thing 😉👍

Ďakujem ze skvelé hodnotenie Ľubo! 😊👍 Som rád že aj ty mám dobrú skúsenosť! 😉

I focused on the phone section of the bands. It was my interest 😊

Lol, I quess it's around 1000 antennas 😄

:D :D Great! It was funny :) But yes I like the sci-fi movies and the best is StarTrek. That's why I choosed the OM0ET callsign :) Extra Terrestrial hi hi... I think one the most shorter callsign in the world in CW :D 73, Paul

Thank you 😃

Yes, but doing it this way, as he did, each band is an actual half wave length of wire by it self. Which is handy for those higher bands, like 11 meters CB. Which will also prove to be handy when he fine tunes each length for the lowest SWR reading as he goes to minimize the SWR for each section of wire with out changing any of the shorter set lengths of wire as each section is tuned in turn. This gentleman is a true crafts man who thinks ahead. In this, he doesn't use the harmonics, as each wire section is an actual half wave antenna as they are added by the splices. We would choose to use the harmonics, in a more portable or temporary SOTA set up and then deal with any off center issues with our radios. 80 meters tends to get a bit off when doing it that way. And a shorter version like a 40 meter antenna, would tend to loose some of those higher harmonics, like the 30 meter band and a few others so those would not be as low an SWR as this method. .

Thank you Michael for very nifty tip ;) I will try it in my next antenna project. :) 73, Paul.

The idea was to create an EFHW antenna tuned exactly for desired band (not use harmonics) and availability of WARC bands too. Therefore I cutted the wire on many shorter elements :) That's why is that my experimental antenna project ;)

@@OM0ET Aha! That explains it and makes sense! For a little while I thought that I had seriously misunderstood the concept of harmonics and the 49:1 transformer with the EFHW. 😁 Good luck and I'm looking forward to the field test. I'm expecting better results than from a random wire EF. 73 from Arctic Norway 🇳🇴

@@michaelfuchs1467 Thanks Michael! I hope that this antenna will work 😉👍

@@OM0ET Came to think about it: In Sweden we actually had a similar antenna with our military HF radio 'Ra195' (That's a modified PRC104) which is still in use by some Swedish special forces units (LRRP patrols made up by pararangers and combat divers - I used to be one of the latter). This antenna used the same idea and was marked on resonant lengths but we just coiled up what was 'left over' to get it in resonance without using harmonics. It probably used a similar transformer (49:1 or 64:1) but I'm not sure. The military frequencies aren't necessarily on harmonics anyway like 'HAM' -bands... I remember this wire antenna working extremely well and it was super simple to deploy - in contrast to the 'high antenna' which was a tall, sectioned mast with dipole rod elements. Usually deployed while grouped and usually not complete when you needed it. The wire antenna was stored in a small canvas bag accompanying the transceiver. I actually owned one of these radios but it was stolen from my TGB13 (Volvo 6-wheel military offroad truck) a few years ago. 😢

The 2 turns of twisted wire is the primer. This way it is simpler than using a single wire with lenghtening the wire by soldering (a joint) to continue with the secondary windings. Variable cap is not necessary, because this winding on this core needs exactly the named cap. ...you need a high voltage one. (the high impedance at the feed-point means low current but high voltage at the same time) Though on the 50 ohm end of the unun you have moderate voltage- but the capacitor handles high RF currents. The extra capacitance makes it possible to have low SWR on all the tuned bands, even at the upper end. (maintaning the linearity by handling the primer leakage at the higher frequencies)

Yeah me too now that I’m thinking about it ? I’m shurr He has his reasons!!

@kingjohnny3841 Please read also the video description, where is it explained 👍

Thanks Panos! Thanks for watching! ;) 73, Paul.

Thanks! That is good idea Victor! But am worry that it would make this antenna very heavy and complicated ;) But somebody should try it because I am curious how it would work ;)

@@OM0ET Again, just a taught. Now, with this great video of yours, it seems to me as the entry point or fundament for such of an idea, it seems to me some vendor will come up with something close based on your great example. 73

I think, a trap antenna with its tuned filters at the segments does the same... - and the manual selection is not necessary. Lenght is selected by the frequency we use.

Somebody recommends 2kV, somebody 6kV, somebody 10kV. All these ratings are reliable. And it more reliable to 15-10 meters bands, maybe mostly for 10meters. But I had max SWR about 2-2,5 at 10meters, might be because of lack of caps, or maybe there is something with wire lenght

That would be great and very helpful 😉👍 Thank you very much! 🙂

Don't worry! :-) I still don't know if this antenna will really work. I have to test it first (part2). Weather here is wet and rainy, so I have to wait :) I wish you have many many nice QSO's with your new End Fed Antenna! 73, Paul.

never mind i watched the rest of the video

@@johnkitchens5174 it was bought in one of the shopping centers with tools, I think Hornbach or OBI 😉

I have used this material because I didn't had the 43 material at this time. I hope I will use 43 in my next antenna projects. This is my first experimental EFHW antenna project so I have used parts which I had available ;) 73, Paul.

I believe type 43 is lossy and type 52 should be used instead, I'm no expert but here's a link to a good PDF from K1RF gnarc.org/wp-content/uploads/The-End-Fed-Half-Wave-Antenna.pdf Type 31 will probably cause a lot of power loss.

Please read also video description

Klein Tools - these cutting pliers cut ties smooth! they’re about $10 at home dopie - in the electrical aisle. Diagonal Cutting Pliers, Flush Cutter, Lightweight, 5-Inch D275-5

Yes. Shortening coeficient vary on diameter of the wire. I use 1.5mm PVC coated flexible copper wire.

@@OM0ET Thanks for informations. 73

Maybe poor soldering? Hmm I donno

@@OM0ET Bending the coax a certain way at the pl259 caused it to short.

It's portable antenna, not for permanent installation.

I have used this material because I didn't had the 43 material at this time. I hope I will use 43 in my next antenna projects. This is my first experimental EFHW antenna project so I have used parts which I had available ;) 73, Paul.

@@OM0ET I see. That's the problem I'm having too, finding the 'correct' material in 'usable' sizes - for a price that is tolerable to me. I'm also having great difficulty comparing materials between producers since 'all of them' (not really that many around) present their products with emphasis on different properties. For example, Ferroxcube doesn't present permeability while Amidon do, and vice versa. It's really hard to find suitable equivalent ferrites I think - not like finding equivalent transistors... Have you found a good supplier for ferrite toroids in Europe, selling small quantities for R&D? I'm usually trusting Elfa Distrelec as my component supplier. This is an old company, in existence since at least the early 1960's, HQ in Sweden and used to have the slogan "Everything between antenna and ground". They became my toy supplier very early! I remember browsing their FAT, bible-like catalog as a kid in the late 1970's, dreaming about NAGRA real-to-real tape recorders and insanely expensive computers. ELFA used to have EVERYTHING and was later the main supplier to the universities and R&D labs I've been working with, like ERICSSON, SAAB Missiles and Bofors in Sweden, but I'm feeling seriously let down by them lately when they're not stocking the toroids that I'm expecting to use. 😁 Ordering from the US is pretty much out of the question due to the insane shipping and handling fees, at least with suppliers that I've come across. Sometimes a seller on Amazon is offering shipping to Norway but that's very seldom. 73! 🇳🇴

@@michaelfuchs1467 FT-240-31 is far supirior to the FT-240-43 in Wideband transformer applications, FT-240-31 covers a greater bandwidth at lower frequencies from 1mhz to 300mhz the FT-240-43 only covers 5mhz to 400mhz. The FT-240-31 is also a lot better for RFI suppression applications such as in 1:1 Common Mod Chokes compared to a FT-240-43 More info Here FT-240-31 toroids.info/FT240-31.php FT-240-43 toroids.info/FT240-43.php

@@Nathan1975Liggy Thank you for the input Nathan. Much appreciated! I want my impedance transformers to perform well between 1.8 - 30 MHz with the main focus in the NVIS region so if 43-material isn't cooperative below 5 MHz this of course changes my priorities a great deal. I'm primarily looking for small (50-size / ~13 mm dia) toroids now for an attempt on an 'ultra-slimline' transformer 'fused' with the antenna connector - to get rid of the traditional boxes on the antenna for a true 'bug-out' EMCOMM aerial as a gift for a very good friend's G1M. Therefore I'm thinking two 50-size toroids stacked and wound with perhaps 0.75 mm dia magnet wire, hopefully making it stand up to 20W 100% duty cycle transmission for up to 30 minutes at a time, so that I can use one with my G90 on full tilt too.☺️ I haven't done any fancy math on this, I'm just guesstimating. To be honest; the math and physics of toroids is far above my level anyway... I'm not even convinced that we actually need toroids for our contraptions (but I have no reason to doubt it either). Why isn't a ferrite rod or 'binocular ferrite' for example, usable for an 'un-un' - or is it?? Any special physics going on in the donut shape? Maybe our sought after 43 and 31 materials aren't very common in other shapes? 🤔 Just curious here, not argumentative! 🤓 Also thank you for your input on CM chokes! I was just in the process of wasting some much needed food money to get myself a beefy 43-material toroid for a coax choke for my 'bug out' radio gear. Now I'm trying to locate 31-material instead that won't starve me to death! 😕☠️ EDIT: Addendum: How about the 'J' and 75-materials? At least it looks promising just by comparison with a transformer noobs eyes. Finally: is there, to your knowledge, any 'online calculators' for impedance transformer construction that takes the core (toroid) geometry into consideration? (I'm going to check your links as soon as I'm finished writing this...) I would guess that we're changing the transformer characteristics if stacking, say three toroids, compared to using one single - since not only the wire length will increase significantly per winding, but the loops will be elongated..? We can't just be upping the power tolerance I guess, but must be altering other aspects as well.? 🤔 As you probably realize; toroid winding is still a great deal of witchcraft to me. 73 from Arctic Norway 🇳🇴!

@@michaelfuchs1467 Thanks for the reply. The links I sent you have a calculator on the page just input the lowest frequency of choice and the ohms 50 and it calculates the turns but I am not sure how accurate it is as I only noticed it yesterday. I think by adding cores you just UP the power level the toroid can handle. I am no expert by a long shot and only mention the 31 as I have researched and done my homework online for both cores and use the 31 myself. good luck with the project 73 de 2E0LIG

answer at 18:35

3:23 L(m)=150xA(0,98)/f(MHz) or L(ft)=468/f(MHz)

They will give different results :-(

@@geokuf9679 yes, exactly. That's why it is it my experimental project. I need to find which formula is closer to reality :)

Hi Richard. An explanation of this cap is in one of the links added in the video description 😉👍

Thanks! No, no, I want to work also on 80 and 40m as you can see it is prepared also for those bands. You can never get precise resonant points on all those bands from 80 to 10 with use of harmonics and traps. Also trapped antennas are much more narrowband than classic precisely cutted fullsized dipoles. 😉👍

Yes I know. But the main purpose of my experimental EFHW was the multiband construction without the coil. Also which will not use harmonics for other bands ;) 73, Paul.

@@OM0ET oh right , thanks 73

I am sorry, but I don't want buy this. I like build things 😉👍

@@OM0ET You got me wrong: i meant check em out in terms of "inspiration" for building :).

@@pulponair Thanks, yes I've seen that product. I think it was on the QRZNOW.COM website ;) 73, Paul.

Ah thank you for info! I will repair the links ASAP 👍

OK, it should be good now ;)

Sure I know it my friend 😊 but the purpose of this video was to made antenna without traps, or don't use its harmonics. Therefore I decided to made full halfwave lenghts and for WARC bands too 👍

@@OM0ET An end fed half for 80m is resonant on many bands, EVEN WITHOUT TRAPS!

@@stephenwalters9891 nice! But all bands like 80/60/40/30/20/17/15/12 and 10 without an external tuner?

@@OM0ET the multiple wave lengths will resonate. Come, this is basic stuff! You should know this!

@@stephenwalters9891 do you have any source please?

Aren't they will be a problem when I throw anteną on tree? Won't them catch of every brenches?

Oh really??? That's pitty! 😔 What was your pwr and antenna?

Respektive kdy bude? Pavel OK6RP ex OK1PRI

Ahoj, pracujem na tom ;)

@@OM0ET ďakujem

Thanks David! :) Partially is multiband without of the links, but on most upper bands is resonance out of the band and aditional tuner is required... And the reason why I made this antenna was completely avoid tuners and additional coils, especially also on WARC bands.

Thank you, Paul! Again, thank you for the great videos!! I also use an EFHW antenna.

Treating each wire section as it is added to make a half wave, allows him to lower the SWR even more, and then add another section with out changing what he's already set. In this, each section is actually a half wave length long and tuned to which area of the band he chooses to use the most. Plus he adds other bands, like 11 meters as well. I enjoy his videos just for those details that make it so well planned out.

@@Possumn1138 I haven't thought of it that way. Good idea! It's not that important with a good SWR match, as long as the radio gets it, but lass is more, also here:-)

And WARC??

@@OM0ET Mine has 1:1 on 12m and 1,6:1 on 17m. Works pretty good and the SWR is "workable" on all bands (No tuner needed), except on 60m and 160m. Remember to put it up as a "L" laying down. It needs a vertical component and will radiate the way the L points.

Yes, You are correct. Problem is that both lenghts (m and ft) were calculated with different formulas. Therefore is slightly different lenght. It's still my experimental project and with real testing I will find which formula is closer to reality ;)

На 10 ватт хватит ))

How so FT-240-31 is more wide band than the FT-240-43 and covers down to 1mhz

@@Nathan1975Liggy SWR is bad. >4.

@@Arkadiy-UN8FR not in my testing

@@Nathan1975Liggy -31 material band width you speak of is only for common mode suppression. The use case here is a impedance transformer. Amidon says in the technical data of -31 material: For impedance transformers please use the 43 material

@@zuwe6622 from the amidon website Here www.amidoncorp.com/ft-240-31/ 31 Material is used for EMI/RFI suppression in the 1 MHz to 250 MHz range. Here www.amidoncorp.com/ft-240-43/ 43 Material is used for EMI/RFI suppression in the 20 MHz to 250 MHz range.

You will never get perfect SWR on all bands WARC included by using harmonics only.

@@OM0ET 1:1 might be, but under 2:1 or 1,5:1 you could get on most common harmonic bands. Why Im getting under 1,5:1 from 40 to 15-12 meters bands? And without caps. Don't need blah blah....

This is portable antenna not for permanent installation

Please read also video description

Almost all HF, just need to play with height and lenght. I'm testing now this type of antenna, exactly to be inverted L, but this is almost the same. Lower bands resonance is too high that it needs to be, but tuner equalizes everything

Please read also video description