How to make a 9 to 1 autotransformer (UnUn)

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  • เผยแพร่เมื่อ 24 ธ.ค. 2024

ความคิดเห็น • 110

  • @GrayPlayer
    @GrayPlayer 5 ปีที่แล้ว +17

    Thank you for the concise video. No extraneous "chit-chat!" Straight forward, clear and to the point!

  • @GenXJohn70
    @GenXJohn70 3 ปีที่แล้ว +4

    Ha. I bought one of the kits from Amazon and the instructions might have well been in Chinese...Your video was exactly what I needed. I followed you and paused on your diagram... I was able to make it and I just worked NY from Arkansas on 1 watt at a flat swr. ... thanks

  • @hennero.3826
    @hennero.3826 2 หลายเดือนก่อน

    Thank you. 🙂

  • @WB8ERJ
    @WB8ERJ 6 ปีที่แล้ว +18

    Oh nice trick with the marker to figure out how long a wire you need - Kudos!

  • @TwfOsÜn
    @TwfOsÜn 2 ปีที่แล้ว +1

    This is the clearest explanation in youtube I have ever seen well done ! 73s

  • @richardnday
    @richardnday 5 ปีที่แล้ว +18

    Very nicely done. You have a great ability to explain complex tasks so that I can understand. Thanks, and I wish you good health. W2UW

  • @sreekumarUSA
    @sreekumarUSA 4 ปีที่แล้ว

    Thanks. The secret of balancing EF antenna impedance to RT/TX set is unfurled. That was very educative. 73s

  • @ericblair3009
    @ericblair3009 5 ปีที่แล้ว +1

    One of the clearest explanation s of the topic! Thx

  • @lostinkansasonasunnyday305
    @lostinkansasonasunnyday305 ปีที่แล้ว

    Nice presentation. Also, so timely for me. Thank you!!

  • @johnblanke2653
    @johnblanke2653 5 ปีที่แล้ว +2

    Great presentation. Clear, concise, great visuals and well done all around. Tnx!!

  • @jamesartmetal8403
    @jamesartmetal8403 2 ปีที่แล้ว

    I like the way you teach. Thanks 👍🏽

  • @area46241
    @area46241 7 ปีที่แล้ว +1

    Excellence as always brother! I like your style. My dad went fast in 2015 didn't get the time to say all the things I wanted to...take the time

  • @steveduecker9872
    @steveduecker9872 ปีที่แล้ว

    Super clear! Excellent!

  • @geirha75
    @geirha75 4 หลายเดือนก่อน +1

    are there 9 turns or 8 turns in an 9:1 unun. I'm kind of confused

  • @markstump7079
    @markstump7079 3 ปีที่แล้ว +1

    Any specifics on the correct toroid to use?? Is there a particular size, material to use for this application? Also best place to get a high quality one.

  • @marekyzr568
    @marekyzr568 4 ปีที่แล้ว +2

    Do not need capacitor?

  • @aurthurdent99
    @aurthurdent99 5 ปีที่แล้ว +2

    Nice explanaton and diagram. Thankyou for the walkthrough. You used 22 gauge wire and said that it was good for approximately 20-30 watts of power. If I wanted to use 100 watts of power 14 gauge ought to be enough I would think.

    • @richardfryer3695
      @richardfryer3695 4 ปีที่แล้ว +3

      .... you would probably be OK with #20 wire on the same core, unless you use 100% duty cycle.. CW key down or RTTY. He's using color coded poly insulated wire but enamel insulated motor armature wire would be better and easier to work with... just keep the 3 winding parallel to each other, meter em out if your not sure. He doesn't mention the core type and material... Amidon T200 red cores are the correct core material.... rated 2-30mhz .. unless your doing 6 meters.

    • @radiotests
      @radiotests 9 หลายเดือนก่อน

      T200 is terrible! 31 or 52 mix is better.​@@richardfryer3695

  • @BarefootBeekeeper
    @BarefootBeekeeper 5 ปีที่แล้ว +2

    Thanks for the clear description and best wishes for your health issues. One thing: should you not use silicone or Teflon coated wire, rather than PVC coated, in case it heats up, as these are prone to do under load?

  • @steveoshaughnessy3736
    @steveoshaughnessy3736 5 ปีที่แล้ว +9

    Never mind. I see it now. The turns ratio is 3:1. The impedance ratio is the square of that.

  • @antenaseinterfacescb
    @antenaseinterfacescb 4 ปีที่แล้ว +1

    Thank you very much to share this video. Make an 9/1 laste week with a toroide of an old TV. Works perfectly in 11 meters also in other bands with other lengths. TKS so much 7351. The best antenna I ever home build with very very good results. Using for 11 meters 4,50 meters long attached to the Balun.

  • @jimcrawford3206
    @jimcrawford3206 2 ปีที่แล้ว +1

    Just one question, Which torrid did you use for this project?

  • @wesleykicker4996
    @wesleykicker4996 5 ปีที่แล้ว +3

    Wow! Thanks for some great tips! I have 3 magnets from a microwave oven that aren’t very “magnetic”. Will they work as a Torrid? If not, where can I find the right Torrid? Really need to know about this so I can move forward. Thanks so very much!

  • @uncledoug9934
    @uncledoug9934 3 ปีที่แล้ว +2

    Your graphic only shows 8 winds in the center of the toroid. Shouldn't it be 9?

    • @twohandsandaradio
      @twohandsandaradio 3 ปีที่แล้ว

      Should be.

    • @Mesa_Mike
      @Mesa_Mike 2 หลายเดือนก่อน

      @@twohandsandaradio It's still a 9:1 though.

  • @richardbogert7675
    @richardbogert7675 4 ปีที่แล้ว +2

    About the best video I have seen on the actual construction of a 9:1. i want to build one now. Thanks so much. KI7OOM

  • @gooberminther3tik25
    @gooberminther3tik25 2 ปีที่แล้ว

    As previously stated the making of the 9:1 UnUn quite clear even a half whit can understand; but, I don't.
    A single wire antenna? What sort of antenna would that be? I don't believe I'm familiar with any.

    • @Mesa_Mike
      @Mesa_Mike 2 หลายเดือนก่อน

      Longwire, or beverage.

  • @jeepnypitpits
    @jeepnypitpits 5 ปีที่แล้ว +3

    Thank you for sharing, may we know the size of the toroid? Thanks 72

  • @jorgerodriguez-wp6en
    @jorgerodriguez-wp6en 2 ปีที่แล้ว

    Hello sir.
    Good job you've done.
    I have several toroids Amidon FT50-43, and 3 pin flat stranded ribbon cable 22AWG. I want to experiment with a Un-Un 1:9 random wire antenna. These toroids (FT50-43) are very small, do you think the 22 caliber will work well or do I need less diameter, 20 or 18 maybe.
    Thank you for answering
    73 Jorge

  • @1873Winchester
    @1873Winchester 2 ปีที่แล้ว

    I am interested in reception only, I guess the power requirements are a lot less then?

  • @ClimbingColorado
    @ClimbingColorado 2 ปีที่แล้ว

    Which torrid did you use?

  • @mikekoffler7312
    @mikekoffler7312 4 ปีที่แล้ว

    Nicely done.

  • @Tropicalianoaff
    @Tropicalianoaff 3 ปีที่แล้ว +1

    Thanks for sharing. Great tutorial. A simple schematic woul help clarify (see comments and questions bellow)

  • @maytronix7201
    @maytronix7201 3 ปีที่แล้ว

    Thanks man, great vid

  • @peterashley6042
    @peterashley6042 7 ปีที่แล้ว

    Excellent video. Please take time for yourself, as needed.

  • @iamhe999
    @iamhe999 6 ปีที่แล้ว +9

    looks like a 8:1 UNUN why not 27 turns with a tap on the 9th turn?

    • @johnblanke2653
      @johnblanke2653 5 ปีที่แล้ว

      I had the same question, but otherwise, the video was extremely clearly presented.

    • @dblake32
      @dblake32 4 ปีที่แล้ว +6

      No, this design is a proper 9:1 impedance matching UnUn. The impedance ratio is set by the three wires being connected in series (A feeds B which feeds C). The number of turns around the core does not determine the ratio.

  • @ramadaxl
    @ramadaxl 4 ปีที่แล้ว

    It helps if you draw out that diagram, then put a colour 'dot' next to the A1, B1, C1 lines, top set ( I used red green and blue wires...sooo...used red green and blue dots ( duh !).
    Do the same thing for the bottom set of wire ends, they should be in the same sequence of course, both top and bottom.
    Then draw the rest of the diagram. I found it just makes it easier if you need to refer back to the diagram at any time, which since I was being VERY careful...I did often !

  • @pekwalker
    @pekwalker 5 ปีที่แล้ว

    What size toroid did you use and where did you find it? Also, what if you wanted SO-239 connectors for both antennas?

  • @lawrenceazzopardi7386
    @lawrenceazzopardi7386 6 ปีที่แล้ว +1

    Very Good Video. Thank you

  • @MrWasim100100
    @MrWasim100100 5 ปีที่แล้ว

    nice video wish you stay healthy and share your precious knowledge

  • @bulldogavenue
    @bulldogavenue 3 ปีที่แล้ว

    Paul, would a Toroid Core FT140-43 Ferrite work? Also, what size of box did you use? I am planning on using mine for a random wire antenna for shortwave listening. I have some 16 AWG wire, will that work okay? Also, how can I connect the coax cable to my radio that has two screw terminals? I wish you the best of health and would like to support you on Patreon if you can sent a link for it.

  • @athertop
    @athertop 4 ปีที่แล้ว

    You mentioned transformer=heat. Does that make it wise to use hot glue?

    • @learnelectronics
      @learnelectronics  4 ปีที่แล้ว

      If it gets hot enough to soften the glue, you are probably going to overheat the wires.

  • @curtstacy779
    @curtstacy779 4 ปีที่แล้ว

    Hey your working on the same kind of things I am! just got my tech license last week and just made a 1:1 balun.

  • @yamakawa511
    @yamakawa511 4 ปีที่แล้ว

    Was that a metric craptonne of power loss or an imperial crapton? Y

  • @craigdexter396
    @craigdexter396 3 ปีที่แล้ว

    How do you make a unun for something with 2500 ohm’s

  • @tomatkinson4616
    @tomatkinson4616 6 ปีที่แล้ว +1

    A great video. Thanks. N2NUT

  • @carldavis8228
    @carldavis8228 7 ปีที่แล้ว

    Big question is how do you determine the impedance of the long wire antenna? The Radio is already marked if it is not to old of a radio.

    • @learnelectronics
      @learnelectronics  7 ปีที่แล้ว +2

      +Carl Davis I believe it is assumed that most long wire antennas are about 450. If it's out of that range, an antenna tuner would be required. I could be wrong here, RF has never been my forté.

  • @fastfridaysfacts3694
    @fastfridaysfacts3694 4 ปีที่แล้ว

    Does it cost more to buy it, or cost less to make it?

    • @learnelectronics
      @learnelectronics  4 ปีที่แล้ว

      Depends on what in your junk box and where you buy from. If you buy from palomar engineers it's cheaper to build it. If you buy from AliExpress, cheaper to buy.

  • @snowdiddley4634
    @snowdiddley4634 4 ปีที่แล้ว

    Thanks Paul, built my first one today, went good. Maybe I’ll meet you sometime we only live about four miles apart hi hi. 73

  • @19134ANDY
    @19134ANDY 3 ปีที่แล้ว

    hello, kool video. can you make one for a 6:1unun

  • @michaelpadovani9566
    @michaelpadovani9566 7 ปีที่แล้ว +2

    Wiring a torroid...they teach that in undergraduate class??

    • @learnelectronics
      @learnelectronics  7 ปีที่แล้ว +1

      +Michael Padovani nah, that's just my interest. This semester is all about passive components, Kerchov, and superposition. Lots of calculus, closed loop integrals dv/dt etc

    • @michaelpadovani9566
      @michaelpadovani9566 7 ปีที่แล้ว

      learnelectronics ah yes fun stuff. Sorry to hear about your dad. On a brighter note, my 3 month baby girl likes watching your videos too! Health and people first always.

    • @learnelectronics
      @learnelectronics  7 ปีที่แล้ว +1

      +Michael Padovani Thanks buddy. 3 months old... About half way to baby food if I remember right? I remember trying to feed my son baby food the first time, it was so funny. You are building great memories my friend.

  • @TheUniversalEyes
    @TheUniversalEyes 5 ปีที่แล้ว

    If you want to get fancy, get some Solarez, after you are done winding the coil, dunk or coat the coil/toroid with the Solarez, put it into the sun for about 3 minutes and you have an instantly sealed and hardened coil, completely waterproof and secure.

  • @boxingday11
    @boxingday11 3 ปีที่แล้ว

    No apologies needed 👍🇬🇧🕊

  • @gartmorn
    @gartmorn 7 ปีที่แล้ว

    Great work as usual. Look after yourself and your family my friend. I'm sure we'll survive without the odd video! ;-)

  • @krisraps
    @krisraps 4 ปีที่แล้ว +1

    Can Someone PLEASE Explain to Me WHY ITS NEEDED FOR ANTENNAS?
    Im Brand NEW In HAM Stuff.
    I Made an antenna today and my radio receives MUCH MUCH WORSE THEN With my antenna :D
    I Didnt think that its possible;e, but god damn, i remove my antenna and signal is beter

  • @lawrycain9739
    @lawrycain9739 6 ปีที่แล้ว

    Does the size or composition of the torrid matter. I've watched a few "training" videos some mention the size and some don't. I typed the number on the torrid in your video and came up with a bearing seal? Great video It's much fun learning this stuff from yous guys. Please keep it up. Thanks. W2AAO

    • @learnelectronics
      @learnelectronics  6 ปีที่แล้ว +1

      The composition of the core matters, size only needs to be big enough. But different cores will react differently at different frequencies.

    • @lawrycain9739
      @lawrycain9739 6 ปีที่แล้ว

      We have something like that at work. Except they're stainless.(Well probably not because they are easy to drill through). We use them for hinges on one of our machine gates.
      But I think they'll have iron ones at the hardware. I can't think of the name of it off hand but we use them to keep things from sliding down a rod. I see the set screw in the one you're working with. One of the guys said he uses a "Powdered core" torrid.?

    • @learnelectronics
      @learnelectronics  6 ปีที่แล้ว

      Yes, mine are powered core. It's just iron and other chemicals ground up and pressed together.

  • @steveoshaughnessy3736
    @steveoshaughnessy3736 5 ปีที่แล้ว +1

    Where does the 9:1 come from? I'm seeing A1 to A2, 8 turns, A2/B1 to B2, 8 more turns, B2/C1 to C2 (and ground) 8 more turns for a total of 24 turns. The tap at C1 is 8 turns to ground. 24:8 is 3:1.

    • @cyberia55
      @cyberia55 4 ปีที่แล้ว +1

      Steve O'Shaughnessy The “9:1” refers to the impedance match. 50 Ohm x 9 = 450 Ohm. The impedance ratio of a transformer is the square of the turns ratio. The square of (3:1) is (9:1).

  • @sreekumarUSA
    @sreekumarUSA 4 ปีที่แล้ว

    Thanks.

  • @prestonshute7243
    @prestonshute7243 4 ปีที่แล้ว

    Good build and for making the video.
    73
    wd4dda

  • @edypujos5729
    @edypujos5729 5 ปีที่แล้ว

    Incorrect picture. wire rotation on the toroid falls in the same position.

    • @cyberia55
      @cyberia55 4 ปีที่แล้ว

      You Tube It’s an Escher toroid. 😄

  • @mrmrlee
    @mrmrlee 4 ปีที่แล้ว +1

    If C1 is being fed by the coax center conductor as in your diagram, and it comes out of the winding as C2 and goes directly to ground, that's definitely a problem right there.
    Splitting it into B2 means half your outputted signal is going to ground before it even reaches the antenna. No way!
    Saying "to your tuner" is not a concise explanation. It needs to be; feedline center conductor, outer braid (which is feedline ground or negative),and station ground.
    In referring to the antenna; antenna feedline/antenna negative or ground/and earth ground. That is how to refer to these various elements.
    Simply saying to the antenna or to the tuner is confusing. Thanks.

  • @georgechambers3197
    @georgechambers3197 7 ปีที่แล้ว +4

    I hope you AND your father are OK!

    • @learnelectronics
      @learnelectronics  7 ปีที่แล้ว +1

      I am fine, thank you. My father is not well. I appreciate your thoughts my friend.

  • @stewartrv
    @stewartrv 6 ปีที่แล้ว

    Nice one! I'd love to see how to make an SWR meter. I guess you need one too!

    • @learnelectronics
      @learnelectronics  6 ปีที่แล้ว

      That is on my todo list. But actually my X108G QRP radio has a built in antenna analyzer.

    • @stewartrv
      @stewartrv 6 ปีที่แล้ว

      learnelectronics I really like the idea of combining the electronics and radio ham hobbies. I only have a few VHF/UHF handhelds and a DMR handheld so far. Plenty of plans to build a load of things but time and money is always an issue. :) Did a classic Pixie radio last year, you might want to have a look that are only a couple bucks on eBay.

  • @YouAllKnowBob
    @YouAllKnowBob 7 ปีที่แล้ว +1

    👍👍 Another useful video! Take care my friend.

  • @BoTrigger
    @BoTrigger 4 ปีที่แล้ว

    Да ладно, бифиляром тоже можно мотать, не страшно если перекрутятся.

  • @markw.schumann297
    @markw.schumann297 3 ปีที่แล้ว

    3:40 "...toroid, like we talked about yesterday." I had to go looking for that: th-cam.com/video/K4zzIqstFtQ/w-d-xo.html

  • @stevenbrown8782
    @stevenbrown8782 7 ปีที่แล้ว

    GB Packers fan?

  • @berniken6511
    @berniken6511 7 ปีที่แล้ว +3

    Good video and explanation, but take care of Dad and yourself before anything else. ........................................Berni

  • @williamriordan7298
    @williamriordan7298 4 ปีที่แล้ว

    good luck to your dad

  • @williampeacock9473
    @williampeacock9473 4 ปีที่แล้ว +2

    Thanks for the information on how to build a 9:1 . Thanks again and I pray that you and your family get doing better.73 AE4OY WILLIAM EM-81UF

    • @Tropicalianoaff
      @Tropicalianoaff 3 ปีที่แล้ว

      Always good to know there is someone praying for someone else's family. God bless

  • @daver681
    @daver681 3 ปีที่แล้ว

    Forget centimeters, millimeters, and all that metric junk and use SAE standard.

    • @leybald60
      @leybald60 3 ปีที่แล้ว +3

      Maybe you'd like to convert all the ham bands to feet or yards while you're at it.

    • @jrstf
      @jrstf 2 ปีที่แล้ว

      @@leybald60 - My yard is likely different size than your yard, that would be a problem.

  • @scott8049
    @scott8049 11 หลายเดือนก่อน

    you should have stuck to the drawing my god have some respect for your work

    • @radiotests
      @radiotests 9 หลายเดือนก่อน

      Your an absolute troll. Stick to.porn videos and let us worry about science things. The video is excellent.