How does a J-pole antenna work? AD#36
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- Опубліковано 30 жов 2016
- Find out how a J-pole amateur radio antenna works! Subscribe: / @davecasler . Ask Dave Playlist: goo.gl/inaQeB.
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One of the best, most straightforward, simplified explanations of a J-Pole I have ever come across. Well done and thanks.
Best explanation of a J-pole I've heard. Now I understand. Keep up the good work. 73.
I fully agree.
But who thought it up in the first place? ... A guy from Poland named Jay?
Absolutely, thanks for explaining it so this dummy can understand.
Amazingly precise yet simple explanation of J-pole. From a Signal Integrity engineer. 73 KE8YVP Jason
Finally, the J-Pole is no longer a mystery! Thank you for this valuable information (as well as how to tune the dang thing). Looking forward to more like this! 73 KE8EAS
Thank you Dave. I finally got it. It's taken years, but I finally get it.
Why didn't someone before you use masking tape and explain the balanced line ?
I now get it, thanks :-)
Wow!!! I can't believe how easy to understand you made that. Subscribed!
Ditto !
THANK YOU, Dave! You have unlocked one of the mysteries of the universe for me, and I learned lots more along the way. Please keep it up!
Brilliant description of J Pole - thanks, takes me back many years.
I just re-watched this excellent video! Best explanation I've ever seen for a J-Pole! Thanks Dave!
Most excellent explanation! Great work.
Wow. What a fantastic explanation. This is great, I always loved the aesthetics of the design, but had no idea how it actually works.
Thanks for your videos. They are very informative. Keep up the great work!!
I really enjoy instructional films like this one. Thank you David. 73!
this was amazing. i mostly understood it in the function of visual RF/wave form, though the explanation of voltage/current/impedance really solidified it.
Thanks Dave. When it comes to electronic theory and practice I need it to be explained to me in simple terminology. I now understand what is happening with this antenna. I appreciate you explaining it for people like me.
I listened to this right after I purchased a nice breakaway J-Pole, and just now. I've learned a lot since July/August and, now I could actually follow what you were saying. Thanks for all the great videos that you do! You really help us learn out here.
Thank you for the very clear explanation. I am impressed. I could figure out the J-shape in the name, but didn't know how else it was supposed to work. Thank you!
This was pure genius! Just beginning my research and your wealth of knowledge is apparent. Thanks!
Thank you! This is THE BEST explanation I've seen!
This is awesome. I've never heard it explained that way. So obvious now. Thanks!
Brilliant explanation! The light bulb just went on, thank you.
This is a really good full explanation of J-pole antenna build, thankyou.
I knew most of those things separately, but you put it together beautifully in a way that makes sense! Thanks heaps for this video, you got yourself a new subscriber :D Cheers from down under!
By far the best explanation of impedance matching I've seen. Thanks 👍
Ten thumbs up! I finally understand the J-pole thanks to your visual explanation. 73, Bob
It's very pleasant to listen to Dave. I'm still a big n00b in antenna's but I'm getting it a little bit.
Excellent video David, thanks
"And the current goes down" (antenna drops, startled look, instant resume, show must go on!). Thanks for the explanation, very concise and to the point!
thank you for a really brilliant video - i love your teaching style, you make it really interesting and engaging, plus your videos are always really polished/professional ! thanks again ! (subscribed)
As others have said, superb explanation of how a j-pole works, certainly one of the best.
wonderful description specially the way of matching balance to unbalance (I mean the loop) perfectly clear
Very good Dave. Very valuable information. We are forming a group of Emergency Communication Specialists here in Saskatchewan and this looks like the dream antenna that we are looking for.
As Usual, a great explanation , you make it too easy, Thanks Dave!
You explained this extremely well. Good stuff!
Thanks Dave for a great explanation on how they work. Now it makes sense.
That the coolest thing I learned today. Thank you Dave
Thanks !!! I finally get why the connection at the bottom is the way it is...it's the 50ohm matching point !!! I have three j-poles I have built and never really got that. I just made it the best SWR and didn't even think about the 50ohm matching point !... Great explanation. Now for my next one I build I will actually look for the 50 ohm point! That also explains why when I experimented with 75ohm coax the connect point was different !
Thank you for this very in depth video of how the J-pole antenna works.
Thanks for the great videos! They are clear and concise and I understand your explanatrions!
Outstanding Dave, thanks for sharing.
Thank you for that awesome instructional.
Wow! That was simple. Thanks for the neat concise explanation. Now I can build one AND simply explain how it works. 73 KB4ROR
Thanks for making this easy to understand! I am researching to get into the radio hobby something I have put off for the last two decades because of elitist and needing good amount of time to learn everything to get things right. This was a great video! I look forward to diving into your channel. Subscribed and up voted.
Best explanation I have heard of that antenna. Thanks. Hoping to make one.
not only was the video entertaining,I actually learnt something,well done.
Very nicely done Dave!
Thanks for the run down. I took notes. I am about to build my first j-pole and this gives me everything I need to know about how they work and what the impedance does. AD5IX
I love making things. I will definitely make a few antennas. This is a great explanation to something I found somewhat puzzling. 73s.
Wow, excellent job in explaining complicated topics.
Well done. Thank you. Operating with an Ed Fong J pole. Explains much.
Thank you very much for making this video!
I just passed my Technician and General exams this past weekend and have been working hard to get a solid station set up while I wait for my callsign -- I plan on building a J-pole antenna this weekend and now I'll know what I'm doing! Great video, very high quality and very concise, thanks again! 73
Terry, welcome to ham radio!
Awesome video. I've been building and using J-Poles for years because of their simplicity. But I never really understood how they work. Now I do.
Nice explanation, Dave! I really enjoyed the part where you explained how the end-feed works. I'd been wondering about that for some time.
I came across this video when I was looking to see if a J-Pole should be grounded.
I've seen enough of your work, Dave, to have a lot of respect for your opinion. Grounded it is, and thanks to this video I see why.
73 de K1PXF
That's a great explanation of how a J pole works, made simple, Dave. I made one yesterday before watching this. It's a super J pole made from 450 Ohm twin feeder. I don't buy aerials. It's still amazing even after 40+ years of my doing radio, what is a short at D.C. can be 50 Ohm at R.F.
Bill, G4GHB.
Total ham noob here. I'm trying to get my license in Canada. This video helped me so much! I learned what's the meaning of 1/2-1/4 wavelengths and this is the best video to understand how an antenna works. Very good job! 73
Thank you.
Dave: 50 years a ham, and I'm still learning cool stuff. Thanks for revealing the mysteries that make this hobby so fascinating. I'm working on my j-pole now. It's my first, but it certainly won't be my last. Too much fun to build. 73 W0AP
great job Dave keep them coming!!!
Thank you for this amazing description God bless
This was a great explanation. Thanks!
Great explanation. Building my first one - amazingly simple to build but harder to understand - thankyou.
I built several of these many years ago without understanding the concept of how they worked. Was always amazed at how good they performed with just a handheld hooked up.
I have always wondered what the science was regarding a j-pole! Very well explained!!! Fantastic video!
Kind regards,
Simon
M0SYS
Best explanation of a J-pole thanks
Thank you my friend... Great way of explaining. I might make one of those
Really nice explanation David, many thanks!
Thanks for the explanation - this made a lot of sense!
Hello, my call sign is W4LAG from Lee, Florida. I am new to Ham Radio and I have been searching the web to learn more about the hobby. Your videos on UA-cam have opened my eyes and hunger to so much more. Thank you for taking the time to help us newbies.
You're welcome!
a really clear lesson, thanks David. made subscription
Exactly what D. Mckee said! I'm a new ham, and have been baffled by j-poles. Mystery solved! Thanks for your great work!
Best instructor ever...73s.
love the hidden lols with 101s great video thank you
What an excellent demo. Well done !
Barry, KU3X
Very nice and clear explanation David. Thank you. 73! S21ON
Watched this, then slept on it. Next day watched it again so I can now understand and explain it myself. Thank you Dave!
Brilliant video . I have used J Poles for many years now I understand how they work . 73 DE G7BWI
Super clear explanation - thanks, Dave!
Thank you
Ahoy sir!. I'm just getting back into the radio hobby after 24 yrs. I'm more of a listen than talk guy( scanner/SW). I have always been both facinated and intimidated by antennas and theory. Your vid was interesting and very simple to grasp. Would like to learn more about it, and get my entry level amateur license. Good job sir 👍
I'm a new HAM, and this was an excellent video for me.
Lol, loved when you dropped the J-pole, showsneven a great presenter like you is human. Great explanation of an antenna I've been using for almost 30 years.
;-)
Very well explained! And in Metric too! Tnx, PD0PSX from the Netherlands.
thank you for posting this video
New Sub from across the pond. Many thanks for you clarity Dave. 👍🏻
THANK YOU!
Someone finally made it make sense for me.
This is still my favorite Ask Dave video
It's one of my favorites too. ;-)
Very clear explanation great video
Thank you for your sharing how to make
j-pole antenna..goodjob friend 👍
I have made several J antennas for the FM broadcast band, centered at 98MHz, They work amazingly well.
Very very well explained good job
Excellent explanation! Thanks!
What a great explanation. I always understood a J-pole was 1/2 wave but the lower section/ matching confused me. I had assumed maybe I was dealing with a 3/4 wave in reality, which will match 50 ohms. Thanks.
Thank you. Your explanation makes a huge difference for this new ham. K9TOB
Great explanation! Now it makes sence.
Awesome, thanks for the info!
Very nice explanation and presentation fella. I normally slip into a coma after 1 min of ham tutorials. But I got to the end of yours ok! 73's M0CPU
I agree with D. Mckee, this was a wonderful description. I never really understood the "magic" of a J-pole, even though I used a couple of them in my early days.
I had gotten your typical copper J-pole from a fellow ham in the local club I belong to. I made a sort of tripod for it, intending to have it free-standing on my 3rd floor balcony of my apartment. I even found spray paint that sprayed very thick, with a textured result like rough stone. It also had flecks of different colors, and when sprayed with this stuff, the J-pole blended into the brick of the building so well you literally could not see it from the ground. Perfect!
Until I used it to transmit. Then the neighbor downstairs would take a hammer and pound on his ceiling (our floor) to let us know that we were interfering with his electronics. It would seem that our 2 meter signal was coming through on everything from his stereo to his clock radio. As this man slept days and worked nights, if I used 2 meters during the day, it would wake him up, when a garbled mess started yammering into the speaker on his clock radio on his nightstand. This would not do -- the guy could complain to the management and cause real problems! So I had to find an antenna that would still let me reach repeaters in the area AND no longer go through his consumer electronics.
The answer was straightforward. A Moxon loop for 2 meters. I made a pair of them with hookup wire stretched on the ends of an "X" shape of dowel rods secured in the middle. The ends of the two elements had small turnbuckles to adjust the length, to allow them to be tuned, and short pieces of thin shock cord to hold them taut. I mounted each Moxon on a free-standing garden privacy fence section, 7 feet tall and 3 1/2 feet wide. It fit against the ends of our balcony very neatly, and I secured them to the railing with cable ties. The Moxon let me get into area repeaters perfectly, and the neighbor never complained again.
I also operated HF from that apartment, using an MFJ random wire tuner for a while, but then upgrading to their tuner with artificial ground. I would fasten a fishing sinker to the end of a spool of magnet wire and shoot it into the woods across the parking lot below. Then the near end would go to the tuner. I worked stations as far as central Europe on that piece of magnet wire!
Thanks for the info!
Thanks for the great work
thanks you helped me tremendously
That was great! I've never understood how those worked. Makes sense now! :-)
Very interesting. Rf is strange stuff. Thanks for the explanation Dave.