Thanks to your videos EFHW is my favorite antenna and my first homebuild project, tested last summer on CB 11m, with it I did my first DXs with 5w only 😀. Now I upgraded it for ham bands! What is still not clear to me is if some improvements are expected with a counterpoise wire, I use it without “grounding” and I have no issues and no RF backflow...
Merci Gil pour cette video tres instructive. Il faut preferer surdimentionner les transfos pour eviter tout signe d'echauffement : echauffement = perte d'energie, tout ca c'est du rayonnement qui n'est pas fait. Donc ne pas lesiner sur le nombre de ferrites. 2 grandes pour 500W, 2 moyennes (1 pouce de diametre) mininum pour 100W parlant de SSB. Et bravo pour le QSO avec le Maine !
This fried the final in my radio! Not to say your transformer in itself did it directly. But my cspacitor came loose and broke connection, therefore the ground and center became a direct short! So, people, make sure you soldier the cap well, or have some kind of SWR meter slways on with this trick.
Another great video, Gil. Built my 49:1 AT to your design 2 years ago, and it's fabulous with my pruned wires. (To date I've been switching between my 20 and 40 metre radiators. Will soon add a 30.) Everybody should have one of these things. They weigh nothing, take up no space, and get you on the air fast.
Nice radio. The vswr should be 1.2:1 OR LOWER at the chosen frequency. I have made several and I use the FT240-43 x 2 stacked as I use 400 watts as an amateur. I also use a single FT240-43 as a coaxial current choke betwen the coax from the radio and the bnc connection you use. This improves the antenna system by giving the efhw something to drive against in the absence of a ground and gives a more accurate vswr scan as any standing waves on the feed line have been significantly reduced. Cheers VK5LB.
I am very impressed with the amount of information in this video. I am saving it and watching it many times to pick up all the subtleties. Whenever I make a halfwave antenna, I always made a center fed, vertical dipole or center fed horizontal dipole. I am too dumb to have made a transformer to end feed it. I am studying this until I have the theory down perfectly. I do not just want to just build blindly. I want to know the theory and the function. Your simple video is extremely intuitive and easy to follow. It is basically just like a regular AC Transformer. Thank you very much from North America.
There used to be a great electronics store....located south of the North train station in Paris. I loved that place. When stationed in Frankfurt, i went to Conrad’s quite often. They had most anything I would ever need. I really miss the years I lived both in France and Germany! Yes, I still have a large roll of “1mm copper wire! 😉
@@RadioPrepper unfortunately I do not remember the name. I am thinking by now it probably does not exist. So many stores like that have closed in recent years! The last time I was there was in 1995.
Hi Gil, I have 2 PRC 320's, one a Yugoslavian LSB model. I will give this a try as 10m and 11m have had some good openings lately with 10m contacts on 5w across Europe. As an Idea a guide to what the band selector actually tunes to might be a good idea as I have had to learn using a frequency counter and a dummy load. I have found very little tuition on You Tube. Thanks for posting as I have no idea how to make a video! 73's M0KIA
Very nice project. 7351. During 2 years I've made some experiences with old toroid of an old Tv, so the measures are 4,40 meters of wire to an HMA End Feed JS20 Portable/Fixed with very good results. The antenna work's very well from 20 meters to 10 meters, and also in 11 meters. The SWR is 1,4 in 20 meters and the others 1:0. Compared to other antennas is less noisy, and the RX signals up in 2 ou 3, and the TX signals up in 2 or 3 also. Now in my QTH, I'm using these new antenna with very good results, compared to an A99. Tks fer sharing and good projects. If you want any other information about these new antenna leave a reply. 7351.
@@RadioPrepper Yes, now I made four antennas. I guess I have conditions to make once a week, during a year. I´m study to make another for 2 meters and 70 cms.
Your videos might be long, but don't worry you explain everything so well, me with limited knowledge of this subject, is learning so much from you. Thanks. What wire is best for the antenna, or can I use any wire.
I find that fine grit sandpaper or an emory board removes the insulating varnish from wire quite nicely without risk of damaging or breaking the wire. I have also heard that you can heat the portion you want removed with a lighter for a minute or 2 helps soften the varnish and makes it easier for the sandpaper to abrade the varnish off And you can always check your work with an ohm meter..
Bravo. Did your friend wind the cable through the ferrite core in the same direction or 5he opposite direction as your construction? Does the direction of winding make a difference?
Hello from Mexico, I am pretty interested on building this antenna for an old Cobra 148 GTL, this antenna seems to work for 10 and 11 meter according to your antenna analyzer which is awesome, I would like to know what type of cable you can use for the antenna. Also at the end of the video you mentioned that you need to trim the antenna (wire) to a certain meters (using a calculator the wire the recommendation is 5.22 m for 27 MHz) at the end which was your measure and also at the end of the tip how do you end? do you use a cover, I saw the other video were you made this same one but the SWR was above 2.0 an this one is between 1.5 and 2 which to me looks great. I am pretty new with no experience at all, so any help is very welcome! Will be nice to know more about HOA antennas because I see they work well for all bands, but is you know a way to build one specific for 11 meters will be nice to know. THANKS!!
Hello !! Greetings from Andorra. I'm trying to put an antenna CB with a magnetic base on a small stand of my roof next to my window, but .. there's no way to get ground plane .... inside the house a short distance from the window I have radiators and everything Type of things where the magnetic base is hooked and I'm sure I would have a good Ground Plane .. So my idea is ... Two magnetic bases could be connected? One on the roof near the window with the antenna, the cable of that base would be the entrance to the other base .. The one that would be put at some good place .. and of the latter to the radio station .. I could work?
Lubec is not far from me. I am down the coast a bit from there. Were you ssb on CB frequency when you made that contact? I have never heard a meaningful contact on CB, usually only 10k watt stations skipping in with rubbish.
@@RadioPrepper Ok, thanks. I thought it sounded to civilized for 11 meters. Thank you for the continued videos of making baluns. I will some day get the nerve to try one.
How does this compare to a half wave over a quarter wave Jpole? Aside from the Jpole being longer?? This is my current setup wire base antenna and it does great. Just wondering how much better this would be...
I use a T2LT antenna for CB. Cheaper and even faster and easier to build with an air wound RF-Choke 5 turns with 11cm diameter. Is this EFHW better than a T2LT for any reason?
143/f en MegaHertz. Donc pour la CB par exemple, 143/27.2= 5.25m On mesure le ROS et on ajuste la longueur. Souvent il faut en couper un peu. Généralement on arrive à 4.75m environ. Pour la bande des 80 par exemple, 3.6MHz, 143/3.6= 39.7m. Avec le transfo on peut alimenter le fil au bout. Sans on l'alimente au milieu, en dipole.
@@RadioPrepper dépendament de la grosseur du fil, vous pouvez mordiller légèrement le tour d'ou vous voulez dénuder avec les pinces pour écraser la gaine de plastique, ça fera un point de démarquation et à partir de là, la gaine s'enlève facilement.. avec un peu de pratique ça deviendra très èvident. J'ai dénudé des pointes de fil pendant des années.... Je cherche à approfondire mon expérience dans le ham radio avant de compléter mes licences. merci pour vos vidéos!
@@RadioPrepper cependant votre technique n'a pas subis d'inovation dans le temps selon ce que je vois... moi je dit ça mais si vous êtes bloqué sur vos habitude sans vouloir les améliorer. Vous pouvez ignorer mon commentaire.
@@RadioPrepper I'm wanting to get a ham license soon. I have a cb base setup now and run CB in my dump truck. I was thinking it would be neat to have some sort of multiband antenna. you know like 10, 11, 12, 15, 40, 80 etc. Is that possible with the end fed antenna's or maybe I'd need a tuner?
Awesome. Multi band antennas aren't easy. A half-wave will give you multiples of the wire's resonant frequency. So a 20m wire for 7MHz will resonate on 14, 21 and 28MHz.. If you want more bands you'll have to use a tuner. Look into the G5RV... Easy to make and cheap...
Why do you always only use end-fed antennas? Are dipoles not more effective? :) Again, t2lt is better for CB. Easy to manufacture and no need to solder anything at all. Well, except for the connector. :) And why do you always use round ferrites? Direct ferrite will be even more compact. Sorry for the stupidity, just curiosity.
There are no stupid questions. End-feds are just easier to use, faster to deploy, and when vertical have a low angle of radiation. Round toroids are just easier to work with as well. Performance is not everything, sometimes ease of use is more important..
Good stuff. End fed half wave antennas are good for multi band use, such as 20 and 40 meter or 10 and 20 meters, but in theory, the lowest angle of radiation from an end fed antenna should be about 0.65 wave lengths long. Any length of wire can be matched to the transmission line, but longer than about 0.65 wave lengths, the angle of radiation begins to increase and that is not desirable. A 0.25 wave ground plane needs to be at least 0.25 wave lengths above the ground to reduce ground loss. From this it was thought that end fed antenna should be at length one antenna length above the ground. Accept a funny thing happens with an end fed half wave antenna. The ground loss is greater and to reduce the ground loss to that of the 0.25 wave antenna, a half wave need to be a full wave length above the ground. The end fed half wave can suffer greater ground loss, even though it might have greater gain. That brings us back to the 0.65 wave end fed wire antenna. The gain is greater (low radiation angle) and it only needs to be a half wave length above the ground to reduce ground loss. Anywhere between a half wave and 0.65 wave length, should increase gain and reduce some significant ground loss if the bottom of the antenna can't be a full wave length above the ground.I would try matching an end fed 0.65 wire antenna and getting the bottom at least a half wave above the ground.
@@RadioPrepper You're absolutely right, I didn't think about that. But in the meantime, treat yourself to a gas soldering iron. :) The refill bottles last forever and there are no batteries on top of the antenna tower. 10 euros are no big deal.
Preppers, do yourselves a favor if the time comes where you need to survive. Don't use CB. Short burst of traffic not long enough to be Fox hunted. CB I guess if you have an established network, certainly not in a single person survival situation. Hey that's my take on things.
Positive name recognition takes one second. Negative recognition is forever...Three interruptions, so far...advertisements louder than video... I will not support any advertiser whose ads do not have an option to 'opt out' immediately. I encourage all other readers to re-post this statement to start pushing back these interruptions...
Build a 11 meter j pole out of aluminum tubing I made one out of copper pipe I pipe a 102 cb car will antenna on the top of j pole it was 27 long short side 9 foot long
Nice work. We still have 27mhz CB in Australia, (US 40ch 5w AM 12w SSB) but we also have a UHF CB band, either 40ch FM @5w or 80ch Narrowband FM @5w (the extra 40ch go in the gap between the wideband channels when you reduce to 2.5khz bandwidth). We are also allowed to use repeaters, which must be public access and have backup power (most are solar with battery backup or mains with solar/battery backup) for emergency 'power out' operation. It's a class license which means as long as you use type approved equipment you don't need an individual license. Repeaters do require an individual license as they are perused for coverage/interference issues with other repeaters etc. We've got all three, some really old 27mhz stuff (from the 70s) and some modern UHF stuff, mix of 40ch and 80ch. You can work between the 40ch and 80ch radios, but the NB radios sound a bit quiet (effectively underdeviating) on a 40ch receiver and the 40ch rigs sound like they are overdeviating on a NB radio of course. There was a plan to ban the 40ch radios after a few years but it was quietly dropped when people objected. So it will probably be a while before all the old 40ch radios (you can't buy new ones anymore) all die, as there are some of the very first UHF CBs, the Phillips FM320 from 1977 still working, particularly on farms and in trucks here and there. You can use high gain antennas such as beams etc of course. My favourite 'improvised and simple' antenna for 27mhz is the inverted V which you just need a length of 50 ohm coax to make. Strip the insulation from a 1/4 wavelength, separate the inner and the outer into two separate strands. Suspend at the point where you separated them and taper the ends down at a 45 degree angle. Run the remaining coax to the rig and fit the appropriate connect (PL259 usually) and adjust for best SWR by trimming the ends of the inner and shield. Directional, at right angles to the wire. A length of fishing line tossed over a high branch works well for a suspension point in the field. Works best about a half wavelength off the ground but still works pretty well only a few feet above it.
You don't need the cap across the input, only needed for random long wire to tune out reactance, but it would be better if it were a variable cap for this purpose !
Love your video, exactly what I was looking for, I will get the materials and build one. What's your or anyone's opinion as to have this antenna as a permanent base antenna?
I watch your a older video about HF antenna 49:1 couple months ago I end up making one with 134 wire it works very well the SWR was excellent and last week I end up making one for CB just to see what it like and using 4.5 wire on 12 watts ssb on 27.405 works extremely well thanks for showing Great video.
I like your radio, too. This Manpack PRC-320, how many bands does it cover? And what kind of protections does it have as far as being able to withstand a broad-spectrum, electromagnetic "event" so to speak? Also, what modulation types does it support? Thanks. I look forward to getting more into antenna design as soon as possible, and that HWEF looks like a fun place to start. Zach, N2JZS
Hi I live in Australia and the ferrite ft140-43 on Ebay are like $50 delivered , There is a local electronics store that sells Ferrites & pre wound chokes , what size Uh am I looking for in a ferrite , thanks Larry
Hi gil watching your vid from reunion island French territory in the Indian Ocean I just purchased a president Lincoln II+ and no antenna yet I would like to make one like this antenna for all the band and mode on this radio and ssb also can you help please
Radio Prepper but the shield works as counterpoise and its length and position affects the final impedance and resonant frequency of the antenna. With line choke at fixed position on the coax we could get more predictable results.
A little, but not a lot with a half-wave, which is a full size antenna just like a dipole. It is just fed at the end. What you describe is for a random wire with a 9:1 UNUN, not a half-wave wire with a 49:1 or 64:1. I've had a lot of common mode current troubles with random wires, very few with half-waves.
@@RadioPrepper how about T2LT antenna in this regard by your opinion? It is also 1/2wave (dipole) but definitely required a choke at the end of feed line...
Yes but the coax shield is pretty different than the center conductor, even if they are both quarter waves. The current is not as well distributed as a single consistent conductor. I have been using these HWEF antennas for years without a choke. They don't need one at low to medium power. Random wires do.
Thanks to your videos EFHW is my favorite antenna and my first homebuild project, tested last summer on CB 11m, with it I did my first DXs with 5w only 😀. Now I upgraded it for ham bands!
What is still not clear to me is if some improvements are expected with a counterpoise wire, I use it without “grounding” and I have no issues and no RF backflow...
How did you upgrade it for HAM?
2:42 I use a butane lighter or soldering-gun to remove insulation; it eliminates nicking the wire.
Merci Gil pour cette video tres instructive. Il faut preferer surdimentionner les transfos pour eviter tout signe d'echauffement : echauffement = perte d'energie, tout ca c'est du rayonnement qui n'est pas fait. Donc ne pas lesiner sur le nombre de ferrites. 2 grandes pour 500W, 2 moyennes (1 pouce de diametre) mininum pour 100W parlant de SSB. Et bravo pour le QSO avec le Maine !
Thank you Gil. So good to see you again. 73 de KG7LOI.
This fried the final in my radio! Not to say your transformer in itself did it directly. But my cspacitor came loose and broke connection, therefore the ground and center became a direct short! So, people, make sure you soldier the cap well, or have some kind of SWR meter slways on with this trick.
Ouch, yes, definitely check the SWR first. You can't check that there is no short because the primary winding is a DC short.
Another great video, Gil. Built my 49:1 AT to your design 2 years ago, and it's fabulous with my pruned wires. (To date I've been switching between my 20 and 40 metre radiators. Will soon add a 30.) Everybody should have one of these things. They weigh nothing, take up no space, and get you on the air fast.
Not my design but thank you! They are great indeed!
@@RadioPrepper I meant that I followed your tutorial here on TH-cam! Thanks again!
I've made a few of these transformers recently with great success. My go-to antenna design now, You can't beat a bit of wire in the air!!!
Nice radio. The vswr should be 1.2:1 OR LOWER at the chosen frequency. I have made several and I use the FT240-43 x 2 stacked as I use 400 watts as an amateur. I also use a single FT240-43 as a coaxial current choke betwen the coax from the radio and the bnc connection you use. This improves the antenna system by giving the efhw something to drive against in the absence of a ground and gives a more accurate vswr scan as any standing waves on the feed line have been significantly reduced. Cheers VK5LB.
With 400W you will certainly get some common mode currents on the coax shield. With 5W, practically none.
Thanks for hints, tips, insight, and lesson.
Please keep recording your adventures.
I am very impressed with the amount of information in this video. I am saving it and watching it many times to pick up all the subtleties. Whenever I make a halfwave antenna, I always made a center fed, vertical dipole or center fed horizontal dipole. I am too dumb to have made a transformer to end feed it. I am studying this until I have the theory down perfectly. I do not just want to just build blindly. I want to know the theory and the function. Your simple video is extremely intuitive and easy to follow. It is basically just like a regular AC Transformer. Thank you very much from North America.
Thanks, see: th-cam.com/video/0zF7bDoqkG4/w-d-xo.html
For field soldering, I use Dremel's butane powered VersaTip iron.
electricty from the sun so as long aa you can make the electrons flow you are good to go
There used to be a great electronics store....located south of the North train station in Paris. I loved that place. When stationed in Frankfurt, i went to Conrad’s quite often. They had most anything I would ever need. I really miss the years I lived both in France and Germany! Yes, I still have a large roll of “1mm copper wire! 😉
You remember its name?
@@RadioPrepper unfortunately I do not remember the name. I am thinking by now it probably does not exist. So many stores like that have closed in recent years! The last time I was there was in 1995.
Gil, thank you for this video! You made it easy!
1mm = 19g Good to see you again. 73 NE5U
Hi Gil,
I have 2 PRC 320's, one a Yugoslavian LSB model. I will give this a try as 10m and 11m have had some good openings lately with 10m contacts on 5w across Europe. As an Idea a guide to what the band selector actually tunes to might be a good idea as I have had to learn using a frequency counter and a dummy load. I have found very little tuition on You Tube.
Thanks for posting as I have no idea how to make a video!
73's
M0KIA
Thanks, I have two as well, USB models. You are a lucky man!
What about building a Tree-Tuner designed by W5JGV that can match any tall tree to a CB Transceiver.
I'll look into it, thanks.
Very nice project. 7351. During 2 years I've made some experiences with old toroid of an old Tv, so the measures are 4,40 meters of wire to an HMA End Feed JS20 Portable/Fixed with very good results. The antenna work's very well from 20 meters to 10 meters, and also in 11 meters. The SWR is 1,4 in 20 meters and the others 1:0. Compared to other antennas is less noisy, and the RX signals up in 2 ou 3, and the TX signals up in 2 or 3 also. Now in my QTH, I'm using these new antenna with very good results, compared to an A99. Tks fer sharing and good projects. If you want any other information about these new antenna leave a reply. 7351.
Lucky the toroid material worked :-)
@@RadioPrepper Yes, now I made four antennas. I guess I have conditions to make once a week, during a year. I´m study to make another for 2 meters and 70 cms.
I doubt it will work above 50MHz, not with a toroid...
@@RadioPrepper tks I will try and send the results.
Your videos might be long, but don't worry you explain everything so well, me with limited knowledge of this subject, is learning so much from you. Thanks.
What wire is best for the antenna, or can I use any wire.
I like copper-clad steel, but you can use anything you want..
Excellent video, Gil! Interesting that the PRC-320 can pick up CB. I'll have to try that sometime. 73!
I find that fine grit sandpaper or an emory board removes the insulating varnish from wire quite nicely without risk of damaging or breaking the wire. I have also heard that you can heat the portion you want removed with a lighter for a minute or 2 helps soften the varnish and makes it easier for the sandpaper to abrade the varnish off And you can always check your work with an ohm meter..
That contact was really impressive Gil and Merci pour le video, very instructive....
Fantastic Work there!! Love seeing these projects come off the Ground!!👍
It was long time, indeed!
LOL @ the topic, all antennas are a compromise, there is no perfect.
Easiest way to strip the insulation is with a lighter flame
You seem like a cool friend
You are a very good teacher Gil, as a new ham and former military, I follow your videos' closely, thanks again, 🎙73's kd9oam.
Thank you. I enjoy teaching.
wow! Nice! I did not think you could talk over the Atlantic with CB! 73! DE1CTL
That was not a CB and not on a CB frequency, but you can with a CB when the propagation is there.
Bravo.
Did your friend wind the cable through the ferrite core in the same direction or 5he opposite direction as your construction?
Does the direction of winding make a difference?
Hi, no difference. I don't remember what he did, it was a while ago..
I like that radio! 😁
Where did you find this PRC-320? Looks like it's in excellent condition! 73
From a private seller. Otherwise: clansman-radio.co.uk
Hello from Mexico, I am pretty interested on building this antenna for an old Cobra 148 GTL, this antenna seems to work for 10 and 11 meter according to your antenna analyzer which is awesome, I would like to know what type of cable you can use for the antenna. Also at the end of the video you mentioned that you need to trim the antenna (wire) to a certain meters (using a calculator the wire the recommendation is 5.22 m for 27 MHz) at the end which was your measure and also at the end of the tip how do you end? do you use a cover, I saw the other video were you made this same one but the SWR was above 2.0 an this one is between 1.5 and 2 which to me looks great. I am pretty new with no experience at all, so any help is very welcome! Will be nice to know more about HOA antennas because I see they work well for all bands, but is you know a way to build one specific for 11 meters will be nice to know. THANKS!!
11m, I think I ended up around 4.8m... Coax, I like LMR240-UF.
Where did you get that PRC 320?, thats a very cool rig!!!
A few years ago..
How critical is turns spacing for the transformer, Sir?
Not very, just spead them out...
I just subbed and i love ur content
What wire did you shorten. The one that screwed into the antenna base I'm assuming
Yes.
73, excellent mon ami, je vais la fabriquer...enespérant un qso avec vous!
So where is the antenna?
Hi I'm new to cb and working on a budget do i have to make two torroids as i see your friend is also making another thank you 73s from 416 Trinidad.
Depends on power... Up to 50W AM/FM or 75W SSB, one FT-140-43 is enough.
Hello !! Greetings from Andorra.
I'm trying to put an antenna CB with a magnetic base on a small stand of my roof next to my window, but .. there's no way to get ground plane .... inside the house a short distance from the window I have radiators and everything Type of things where the magnetic base is hooked and I'm sure I would have a good Ground Plane .. So my idea is ... Two magnetic bases could be connected? One on the roof near the window with the antenna, the cable of that base would be the entrance to the other base .. The one that would be put at some good place .. and of the latter to the radio station .. I could work?
I doubt it. Try connecting a few radial wires to the coax shield at the base if possible..
@@RadioPrepper Thanks !!
HAHAHA MAINE307 ! LOVE IT ! THANK YOU wonderful video cest bonne
Gil, I like that analyzer. What is it and where did you get it?
elekitsorparts.com/product/faa-450-antenna-analyzer-eu1ky
@@RadioPrepper Merci, Gils!
I must have missed a few steps here
Lubec is not far from me. I am down the coast a bit from there. Were you ssb on CB frequency when you made that contact? I have never heard a meaningful contact on CB, usually only 10k watt stations skipping in with rubbish.
USB and AM. Yes, few people around but it happens...
Hi - I think Gil was on 20m at that point.
Yes 20m.
@@RadioPrepper Ok, thanks. I thought it sounded to civilized for 11 meters. Thank you for the continued videos of making baluns. I will some day get the nerve to try one.
No need for nerves. It's very easy :-)
How does this compare to a half wave over a quarter wave Jpole? Aside from the Jpole being longer?? This is my current setup wire base antenna and it does great. Just wondering how much better this would be...
A J-Pole is a half-wave, so similar..
Can it be made with regular strand plastic coated wire or do you have to use that solid enamal coated wire to make the coil?
It should work.
Hi. Can I use uninsulated copper wire?
Hi, yes.
Gil,
Can a 11m 5/8 wave wire antenna be made with a torrid?
Yes, but you need to find out the impedance of an end-fed 5/8 wire.
@@RadioPrepper
Do you have a email account.
gil@radiopreppers.com
I use a T2LT antenna for CB. Cheaper and even faster and easier to build with an air wound RF-Choke 5 turns with 11cm diameter.
Is this EFHW better than a T2LT for any reason?
Yes. The T2LT uses resistors for impedance matching, multi-band use, that means more losses. The EFHW is more efficient and simpler.
Excellent,,,,new sub
Why did you not use lighter to burn off cover on wire
I find it a little messy..
*PL*ug-259 ... *SO*cket-239
Merci beaucoup Gil. après tout comment quelle est la longueur du fil d'antenne si cela ne vous dérange pas de nous le faire savoir?
143/f en MegaHertz. Donc pour la CB par exemple, 143/27.2= 5.25m On mesure le ROS et on ajuste la longueur. Souvent il faut en couper un peu. Généralement on arrive à 4.75m environ. Pour la bande des 80 par exemple, 3.6MHz, 143/3.6= 39.7m. Avec le transfo on peut alimenter le fil au bout. Sans on l'alimente au milieu, en dipole.
@@RadioPrepper Merci Gil pour votre énorme aide. J'ai une question; à quelle distance du sol doit-on déployer le fond de la boîte d'alimentation.
Ça marche avec la boite au sol mais mieux à 2-3m...
Hi what size of wire did you use for the radiator?
I don't remember! Not important...
les pinces svp coter plat en direction que vous poussez le denudage du fil. merci . bonne continuation.
Je vais essayer!
@@RadioPrepper dépendament de la grosseur du fil, vous pouvez mordiller légèrement le tour d'ou vous voulez dénuder avec les pinces pour écraser la gaine de plastique, ça fera un point de démarquation et à partir de là, la gaine s'enlève facilement.. avec un peu de pratique ça deviendra très èvident.
J'ai dénudé des pointes de fil pendant des années....
Je cherche à approfondire mon expérience dans le ham radio avant de compléter mes licences.
merci pour vos vidéos!
Je dénude des fils depuis 40 ans...
@@RadioPrepper cependant votre technique n'a pas subis d'inovation dans le temps selon ce que je vois... moi je dit ça mais si vous êtes bloqué sur vos habitude sans vouloir les améliorer. Vous pouvez ignorer mon commentaire.
J'utilise déjà cette technique.
Is this how the Antron 99 wirks?
Probably not exactly but also an impedance matching circuit.
@@RadioPrepper I'm wanting to get a ham license soon. I have a cb base setup now and run CB in my dump truck.
I was thinking it would be neat to have some sort of multiband antenna.
you know like 10, 11, 12, 15, 40, 80 etc.
Is that possible with the end fed antenna's or maybe I'd need a tuner?
Awesome. Multi band antennas aren't easy. A half-wave will give you multiples of the wire's resonant frequency. So a 20m wire for 7MHz will resonate on 14, 21 and 28MHz.. If you want more bands you'll have to use a tuner. Look into the G5RV... Easy to make and cheap...
Why do you always only use end-fed antennas? Are dipoles not more effective? :) Again, t2lt is better for CB. Easy to manufacture and no need to solder anything at all. Well, except for the connector. :) And why do you always use round ferrites? Direct ferrite will be even more compact. Sorry for the stupidity, just curiosity.
There are no stupid questions. End-feds are just easier to use, faster to deploy, and when vertical have a low angle of radiation. Round toroids are just easier to work with as well. Performance is not everything, sometimes ease of use is more important..
Good stuff. End fed half wave antennas are good for multi band use, such as 20 and 40 meter or 10 and 20 meters, but in theory, the lowest angle of radiation from an end fed antenna should be about 0.65 wave lengths long. Any length of wire can be matched to the transmission line, but longer than about 0.65 wave lengths, the angle of radiation begins to increase and that is not desirable. A 0.25 wave ground plane needs to be at least 0.25 wave lengths above the ground to reduce ground loss. From this it was thought that end fed antenna should be at length one antenna length above the ground. Accept a funny thing happens with an end fed half wave antenna. The ground loss is greater and to reduce the ground loss to that of the 0.25 wave antenna, a half wave need to be a full wave length above the ground. The end fed half wave can suffer greater ground loss, even though it might have greater gain. That brings us back to the 0.65 wave end fed wire antenna. The gain is greater (low radiation angle) and it only needs to be a half wave length above the ground to reduce ground loss. Anywhere between a half wave and 0.65 wave length, should increase gain and reduce some significant ground loss if the bottom of the antenna can't be a full wave length above the ground.I would try matching an end fed 0.65 wire antenna and getting the bottom at least a half wave above the ground.
I'll have to try thanks.
There will be an antenna on CB for DX?
That one would work well, yes.
Good explanation
and get yourself a Gas Soldering Iron :)
73 de DO1OH
I can solar charge a battery... Where do I find gas in shtf?
@@RadioPrepper
You're absolutely right, I didn't think about that. But in the meantime, treat yourself to a gas soldering iron. :)
The refill bottles last forever and there are no batteries on top of the antenna tower.
10 euros are no big deal.
Where do you find the transformer cores?
I buy them on Ebay..
@@RadioPrepper O.K. let me try this. What do you type in to find this Balm core? I cannot find the cores...but can find high price ones already made.
FT-140-43
I'm gonna n the Stat of main to
I WANT BUILD A POWER AMP MABE 300 OR 400 WATT
Useless, waste of electricity and money... Concentrate on the antenna system.
Ok thank ya
WOW
best antenna ever huh?
For me yes.
Can you teach me
Just watch all my videos!
@@RadioPrepper thank you you are a good friend 👍
👍
Si quelqu’un peut traduire pour ceux qui ne sont pas anglophones..
Lien vers la version Française dans la description.
@@RadioPrepper autant pour moi ^^"
tu es allemand ?
@@W-733_KWX Français mais je parle allemand
Preppers, do yourselves a favor if the time comes where you need to survive. Don't use CB. Short burst of traffic not long enough to be Fox hunted. CB I guess if you have an established network, certainly not in a single person survival situation. Hey that's my take on things.
Depends on the nature of the crisis...
"SO" = 'SOcket'/female..."PL" = 'PLug'/male
Indeed, I never use them so... 😉
Positive name recognition takes one second. Negative recognition is forever...Three interruptions, so far...advertisements louder than video... I will not support any advertiser whose ads do not have an option to 'opt out' immediately. I encourage all other readers to re-post this statement to start pushing back these interruptions...
I had 0 ads during the vid?
Weird, thanks
I had no video interuptions during my video, must be your service provider cutting in with commercials?
I sure did not add those...
@@shanesmith3753 I have no idea. Does anyone know of any way to check who is inserting commercials?
oooo thanks I really needed this.
Good straightforward build Gil and a bit of a French lesson thrown in 😃 👍🏻
thanks Gil I wrote down the number of turns in my radio note book this time will make one up myself. Glad to see you back on YT.
Build a 11 meter j pole out of aluminum tubing I made one out of copper pipe I pipe a 102 cb car will antenna on the top of j pole it was 27 long short side 9 foot long
Nice work. We still have 27mhz CB in Australia, (US 40ch 5w AM 12w SSB) but we also have a UHF CB band, either 40ch FM @5w or 80ch Narrowband FM @5w (the extra 40ch go in the gap between the wideband channels when you reduce to 2.5khz bandwidth). We are also allowed to use repeaters, which must be public access and have backup power (most are solar with battery backup or mains with solar/battery backup) for emergency 'power out' operation. It's a class license which means as long as you use type approved equipment you don't need an individual license. Repeaters do require an individual license as they are perused for coverage/interference issues with other repeaters etc. We've got all three, some really old 27mhz stuff (from the 70s) and some modern UHF stuff, mix of 40ch and 80ch. You can work between the 40ch and 80ch radios, but the NB radios sound a bit quiet (effectively underdeviating) on a 40ch receiver and the 40ch rigs sound like they are overdeviating on a NB radio of course. There was a plan to ban the 40ch radios after a few years but it was quietly dropped when people objected. So it will probably be a while before all the old 40ch radios (you can't buy new ones anymore) all die, as there are some of the very first UHF CBs, the Phillips FM320 from 1977 still working, particularly on farms and in trucks here and there. You can use high gain antennas such as beams etc of course. My favourite 'improvised and simple' antenna for 27mhz is the inverted V which you just need a length of 50 ohm coax to make. Strip the insulation from a 1/4 wavelength, separate the inner and the outer into two separate strands. Suspend at the point where you separated them and taper the ends down at a 45 degree angle. Run the remaining coax to the rig and fit the appropriate connect (PL259 usually) and adjust for best SWR by trimming the ends of the inner and shield. Directional, at right angles to the wire. A length of fishing line tossed over a high branch works well for a suspension point in the field. Works best about a half wavelength off the ground but still works pretty well only a few feet above it.
Yes, I watch 4wd AU channels sometimes and they all have them!
You can always import a 27 meg from the USA Stryker 955 is a grand one
I have the french built crt ss9900 very good rig 80 watts out the bàck end on side band
try fine sandpaper
Thanks for this video. It is exactly what I was looking for. By the way a 1mm wire is an=bout 18 gauge. Merci!
Just bought one of these from par end fedz. Looking forward to it getting here so I can try it.
Great to hear from you, happy new year.. J
Interesting project. However, I wish I could see pictures and diagrams of the entire antenna.
Check out the half-wave end-fed group on Facebook...
You don't need the cap across the input, only needed for random long wire to tune out reactance, but it would be better if it were a variable cap for this purpose !
Love your video, exactly what I was looking for, I will get the materials and build one. What's your or anyone's opinion as to have this antenna as a permanent base antenna?
Sure, I would epoxy a fishing rod in the extended position and attach my wire to it.
Great video - thank you from upstate NY.
Thanks buddy!
I watch your a older video about HF antenna 49:1 couple months ago I end up making one with 134 wire it works very well the SWR was excellent and last week I end up making one for CB just to see what it like and using 4.5 wire on 12 watts ssb on 27.405 works extremely well thanks for showing Great video.
I like your radio, too. This Manpack PRC-320, how many bands does it cover? And what kind of protections does it have as far as being able to withstand a broad-spectrum, electromagnetic "event" so to speak? Also, what modulation types does it support? Thanks. I look forward to getting more into antenna design as soon as possible, and that HWEF looks like a fun place to start.
Zach, N2JZS
Everything between 2 and 30MHz. I don't know about protections...
@@RadioPrepper
Thank you, sir. 73
Nice video Gil, Thank you! that's probably 14 AWG wire.
Nice radio you have there.
I have never seen a radio like that one in the video. Is it a ham radio?
Military PRC-320.
You inspired me once again kg6mn
Bonjour, j'aimerais savoir pourquoi le condensateur dois avoir un si haut voltage 3kV le signal n'est-il pas faible ?
Oui mais la distribution du courant avec son maximum au milieu du fil et minimum aux bouts fait qu'il y a un maximum de voltage aux bouts.
Amazing
Hi I live in Australia and the ferrite ft140-43 on Ebay are like $50 delivered , There is a local electronics store that sells Ferrites & pre wound chokes , what size Uh am I looking for in a ferrite , thanks Larry
140 is the size, or 1.4inch. You can use 82 or 240 size. Just make sure the material is type 43..
Excuse my lack of knowledge, but after you built the 49:1 transformer and found that around a 4.5m of wire was good did you need to use an ATU?
Hello, no ATU needed.
Great video, thank you!
Hi gil watching your vid from reunion island French territory in the Indian Ocean I just purchased a president Lincoln II+ and no antenna yet I would like to make one like this antenna for all the band and mode on this radio and ssb also can you help please
The video explains it well but feel free to ask questions here..
No feed line choke (to isolate coax feed line from antenna)? Is there a good reason?
It's a half-wave, not a random wire, very little common mode currents on the shield.
Radio Prepper
but the shield works as counterpoise and its length and position affects the final impedance and resonant frequency of the antenna. With line choke at fixed position on the coax we could get more predictable results.
A little, but not a lot with a half-wave, which is a full size antenna just like a dipole. It is just fed at the end. What you describe is for a random wire with a 9:1 UNUN, not a half-wave wire with a 49:1 or 64:1. I've had a lot of common mode current troubles with random wires, very few with half-waves.
@@RadioPrepper how about T2LT antenna in this regard by your opinion? It is also 1/2wave (dipole) but definitely required a choke at the end of feed line...
Yes but the coax shield is pretty different than the center conductor, even if they are both quarter waves. The current is not as well distributed as a single consistent conductor. I have been using these HWEF antennas for years without a choke. They don't need one at low to medium power. Random wires do.
I’m a beginner at radio , I have a Galaxy 959 ssb radio , could I make this type of antenna for emergency use
Absolutely, check my other videos about end-fed half-wave antennas, 49:1 transformers.