How to Wind a 49:1 Transformer for your End Fed Have Wave Antenna
ฝัง
- เผยแพร่เมื่อ 13 เม.ย. 2022
- 👉 Get Yours on TOADs Discord: / discord
Click the 👍 Like Button, 🤡 Leave a Comment, ❤️ Subscribe
👉 Support The Channel 👈
❤️ Patreon: / temporarilyoffline
📺 TH-cam Memberships: th-cam.com/users/temporarilyof...
💸 Tip Jar: paypal.me/temporarilyoffline
👕 Merch: shop.spreadshirt.com/temporar...
🧰 Gear I Use: kit.co/TemporarilyOffline
🛒 Amazon Link: www.amazon.com/shop/temporari...
📻 $15 off at Radioddity: radioddity.refr.cc/temporarily...
👉 Fun Stuff 👈
👉 TOADs Discord: / discord
🕊️ Twitter: / kilomike9golf
😸 Github: github.com/TemporarilyOffline
Where possible, all links are affiliate links, this youtube thing is an expensive endeavor and every little bit helps. - วิทยาศาสตร์และเทคโนโลยี
![[UNCUT] ฝันรักห้วงนิทรา | EP.9 (3/4)](http://i.ytimg.com/vi/ikd1tEhXbp8/mqdefault.jpg)
Great video. I've watched several videos on how to wrap a toroid, and yours is by far the easiest to follow. Cheers. 73 W2ASH
Wow, thanks! Glad it helped!
I'm glad you made this video, it shows how a normal person winds a toroid, not magically like Ape does it.
I'm not as good as Ape.
@@temporarilyoffline No one is...
I see the kit comes with 90' of wire, 70 for the radiator and 20 for the counterpoise to start with. I'm assuming that I would need to trim down to ~66ft to end up resonant on 40/20/10. What SWRs can I expect on each band if I tune for 40m? What length counterpoise are people having the most sucess with?
You can tune it as close to 1:1 as your patience allows for... then once you move it to a new location it will be a little different like you'd expect from any antenna. We recommend a 17' poise to start. We've seen people use no poise with success also.
Magic!
Thanks!!
I’m still trying to wrap my head around baluns and ununs (pun intended). I understand how AC transformers work, but they’re wound in pretty straight forward ratios. Is this method just more simple to do by hand? Wouldn’t it be more efficient to do 490 turns around the toroid with 24ga, and 10 turns equally divided with 16ga? I’ve seen so many methods used so far. Also, does the ferrite size matter? Obviously too small will saturate. But is there a downside to too big?
The concepts are all similar and you make me think its like reducing fractions - if 4:8 is good, then 2:4 must be good, then 1:2 much be good... so less work?
2 primary, 14 secondary -- 14/2 = 7 -- 7*7 =49 -- 49*50 = 2450 = close enough to the feedpoint impedance of an EFHW wire.
Secondary/Primary = (M)
M^primary = (transformation)
(transfromation)*50 = amount of transformation
(50 is the arbitrary agreement on ohms for antennasand radios)
The size of the ferrite matters in terms of heat dissapation, which sets the amount of power you can put into it. We are using a 140 which is good for 50w "full duty" - a larger core would be able to dissipate more heat = more power!
The "mix" - 43 in this case is the magical properties that we need to transform the impedance properly.
Hope I got it all!
I have watch y'all wind countless toe-roids and this video makes the process less intimidating. TNX, TO!
Thanks Phil! I triednto make this one only about the toroid so that this part didn't get drowned out.
I was wondering if different materials have different ranges of optimal usage, and many people tried different materials, and many people used multiple cores at the time then why nobody tried to put into a balun two cores of different materials?
That's a good question! I would assume the "stacking different types" is why we have come up with different types - somebody needed a 31 and all they had was a 43 and a 12... found out it did the trick and then made a 31... and here we are!
@@temporarilyoffline then 31 and 43 makes 37 mix
Ok, so I messed up the math a little 😇
Do we see it in action on different bands?
Yes, I'm going to do a lot of in depth mini videos on this subject to help folks with the build process. And then some action videos after I get it built.
You need a 64-1 un-un for endfed antennas for these bands, cut wire about 64 feet? if I remember right, to tune it for the CW portion of the bands, a 49-1 will work, but not as well as a 64-1 transformer, if you are looking for side band you will need to shorten the wire length.
I work CW only so I am not to familure with the two harmonics you get with a wire cut for 40 meter side band, I am going to assume you will still get a usable meaning very low reading of the VSWR for 20 and 15 meters, 10 meters on the other hand the impedenance will be much higher where you could get by using a match box (tuner). I never use one so If I were to work 10 meters I would cut a wire length for 10 meters. I also only work QRP, I feel a good antenna that is not compermised by using a match box is my best option.
Being able to very quickly to throw up an 1/2 wave endfed antenna, not to be mistaken by a ramdon wire, they are two diffrent antennas, anyway it does not take much time throwing up wire antenna and switching one out for another only takes a couple minutes, after all you already have the throw line up all it takes is lower the antenna unhook and hook another then pull it up connect to the transformer and you are good to go.
I never use a tuner, but I do carry an antenna analyzer with me, the one I choose is Rig Expert Stick 230. only takes a few seconds to check impedance, lot less time than fiddeling with a match box.
Your mileage may very!
TIMTOWTDI
How I understand it. a EFHW in the lower bands (< 10 MHz) has a higher Impedance(~3200Ohm) than in the higher bands(~2450Ohm). If you want to specifically build a EFHW for lower bands I would build a 1:64 Transformer. But for a antenna that also uses the "higher" bands I would use a 1:49 Transformer. In a perfect world the impedance mismatch would cause a SWR of ca 1.3-1.5 on the lower bands, which is fine.
I looked up that toroid by the number given on Amazon and the one that came up is only 3/4” diameter, but yours is 1.5”, why?
Try this link: amzn.to/3vc52lx Although Amazon isn't really a good place to get one, they are expensive. The spec is the first number is the width and the second is the "mix" which defines its properties.
@@temporarilyoffline thanks.
Hi Steve,
How much power can it handle? 73 WJ3U
100w SSB, 50w digital
Hey Steve, I've discovered an easier way to wind this 49:1 or any balun/UNUN that starts off with twisted wire .I'll try to catch you tomorrow on the morning discord if you're around.
Sounds good!
how is it 49 to 1? with only 11 turns? Oh what power will that take? I have 1.2K amp and a Palstar AT2K looking use it on 60,40,20m
best 73 Noel G8NDT
Don't know what you do/don't know, so if you know all this, skip to the end:
2 primary, 14 secondary - you'll see 12 turns and then the extra 2 turns that run twisted with the secondary gets you to 14 total passes through the core of the 'roid.
14/2 = 7
7^2 = 49 (7 squared)
That's how you get the 49:1 maths.
This particular wrap will handle 100w sideband and 50w digital. You'd need to add more cores for heat dissipation and thicker wire for power handling.
You can get 40 and 20 for sure, but I'm not sure about 60,40,20 as 60 isn't a harmonic. There are creative ways to add it, but... Sounds like you're going to have some fun!
Все показывают как изготовить трансформатор 49/1. А как изготовить катушку 120 mkG нет видео. Может надо индуктивность 100 или 110 mkG.Что бы кородкий отрезок на 3.65 мГц был длинее. Меньше добротнось, шире полоса ?
If I understand right, there are a few ways to do this: 1. Use a longer wire to get resonant on 3.65MHz, 2. Use a loading coil on the current wire-size 3. Wind the transformer differently to make a match. Definitely possible!
How can I order the CAHRtenna
We are currently sold out. Join TOADs discord (link in description) to hear when the next batch is coming out. Or subscribe here for more info.
Nice, If a TOAD and an Ape can do it anyone can! :)
🤣
You know it!
What's the difference between the 9:1 Balum and this 49:1 ?
The 9:1 is designed to transform 450ohms to 50 (450/9) and the 49:1 is designed to transform 2450 to 40 (2450/49). Then you attach a wire that makes your radio or your radio's tuner happy and gets your desired mission complete
Thank you for your answer @@temporarilyoffline
You're welcome. Hope it helped! @@kr4awkr4aw5
Thanks Steve - never wound a Toe-roid :)
I hope this makes it look easy!
Your velcro sleeve closures are too much and I mean cool. I better understand the way you wrap and count a toroid much better.
Velcro sleeves is the future man! Thanks, glad it helped!
@@temporarilyoffline I used to use the trailer park velcro shoes then these slip-on's came along.
THIS IS LIke HAM RADIO 101!!!!!if someone that doesn't know how to do this as a ham you need ask yourself are you really a ham. lolololol
Hams support and educate each other with community spirit. Where's yours?
get real bucko