5/8 wave J-pole antenna for 145 MHz
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- Опубліковано 8 вер 2024
- A 5/8 wave J-pole antenna, that I made from copper tubing, a piece of steel wire from a mobile CB antenna, and other stuff. Works very well, has a SWR of 1.2-1. And also what I like about it, is that I can earth it at the bottom, so it's "lightning protected". 73!
Two different physical methods of easily adjusting the antenna is superb.
That tuning part was an idea that made me go wow! I love it!
Great idea on the tuning bolt stub. Have to add this to mine. Thanks for posting.
Very gd, is nice when people build stuff , you don’t get that craftsmanship anymore, Greg from Florida
The stub is the 1/4 wave part, the radiator is made out of a 3/4 section, the 1/2 wave phasing element, and the upper part is 1/2 wave made from the whip antenna. Performs pretty well! Take care! Pityu YO6PNQ
Very Funny : I built the same 20 years ago. It was almost totally identical, painted black like this one, with a bolt on the short leg for adjustement and a thin upper part on the long leg. Only difference : The thin part was 6mm copper tube with another screw at the end to adjust. It worked like a charm for about 5 years on the roof of a 17 store building. Then I moved to another house and tried something else :)
I have only just seen this antenna and I am well impressed, thank you for the video!
not only very cool j-pole but very very cool shots and monologue, thank you!
Very cool. Good job on the video. I also like your furniture :)
I love the tuning components you put in!
Very fine handmade antenna... Congratulations...
I have seen antenna like this but you have some good improvements. Thank you for the ideas! 73! W4DES
I with you had included a link to the measurements.
Nice bit of kit. Love the thing. Going to build one too!
Best jpole build I've seen
Wow! Great looking antenna!
Very Nice Antenna!!! Thanks for sharing.
Nicely done. Thanks for sharing.
73's from Australia.
Impressive. Neatly and professionally done. Bravo. 73
Great job!73’s from California!
The coiled coax is there to connect the coax (unbalanced) to the antenna which is balanced, hence BalUn. 73 PD0PSX
I use the CB Whip part to spank my girlfiends butt too. She seems to enjoy it, idk. Great build man, thanks for sharing. I finally got a HF Transceiver, an Icom 7410. Now I'm stuck in an apartment with no antenna tolerance. I put 16 ft. Of bare wire around the walls at my apt. Working 20 meters, 17, 15, 12, and finally 10 meters sunday to Virgin Islands from Western Arkansas. I need a boost on 2 meters to hit our repeater due to all the apartment bldgs. I have around me. So thats a solid aluminum tube ring...Wow, I have some in my closet. Thanks again sir, I hope to hear you on the bands. 73
AF5DK,
Phil
Phillip Swearingin build a mag loop. 3-4 feet in diameter and can handle 200W+ with the correct capacitor
That is some kind of steam punk cool antenna. Nice!
I love your antenna!
very nice setup for your Jpole, KF5DMC
Pros : Excellent Pro-Look and Finish , you can sell it ..
Cons : i am only worried about the SO-239 fixed in a board which susibtiable to break in rough condition ..
However
i think this is not 5/8 element as the video address.
i think this is a 2 HalfWave Collinear Elements working together as both have the same Phase ..which yelds = more Gain + Lower Radiating angle than the conventional (5/8 wave Antenna = 4 feet antenna for mobile)..
5/8 wave lenght = 3.5 dBi
2 halfWave = 5.5 dBi (Better but Longer)
I wonder if You could give me precise mesuments of the elements . Starting with the whip , the copper pipes !!! If i'd like to build one for myself .It'll be great and appreciated very much . thanks a lot for the film !!! ))
excellent work, could you post or send a plan or drawing with the measurements please?
Very good English. Nice design & execution. +207
jolie montage propre et bien fait
Very good build Job, and also a way cool cactus Jpole.
73
Jimmy, ARRL TC, WX9DX
Thanks for your video. I have 2 J-pole antennas for 2 meter and 70 cm. But I would like to build a antenna for 6 meter like you show here. Nice work.
73 de LA9OCA Manfred.
Very nice oak. One of the best “home brew” antennas I’ve seen. Do you sells plans for it?
if you were to take a reasonable hobbyist's whack at hailing NA1SS (the International Space Station here uses somewhere around 145 MHz in this region usually more so than the VHF2 channels) which style 2m antenna would you use without going motorized tracking (I am not above stationing up to three stationary antennas on the roof, though - I have tubes and wires to spare, and a 3-antenna switch). Thanks!
Jeff Burris the ISS uses VHF up and UHF down. The freqs are on the ISS home page.
Nice job Pitu!
GREAT DESIGN !!
It would have been nice if you had given the deminsions of the copper tubing and the ballon at the feed point. Also what benefit is the hat at the top of the copper tubing and what is it's deminsions? 73s, W5BNW, Cliff.
Good video. Thanks
thank you
73
HS4RBS
Beatifull!!!
Szervusz!
Good work Keep it up, Interesting.
73 de VA6POP
Impressive
Just found this and am intrigued. GREAT design. However you call it a 5/8 J-Pole antenna, yet the phasing element is at 1/2 λ and the CB antenna you stated as 1/2 λ but looks about 5/8 λ in length… ? Doesn’t the addition of the “CB” antenna mess up the 5/8 λ total length of the 2 Meter length side of the J-Pole? Also the diameter of your balun, ~5”? 5 turns? Thanks! Newbie… KI7QAB 73’s!
you should have done 1/4 wave element 1, then 1/4 wave first section element 2, then another 1/4 wave phasing element, then 1/4 wave cb whip element, = 1 full wave and it would have been shorter over all.
of course this would mean the center conductor would connect to the small 1/4 wave element and it should be isolated from the rest of the antenna . basically the open stub design.
sir sorry to bother you so you deff 100% count the phasing element as well ? every time ? so in your case your phasing element used two of the eights or 2/8 ? his set up has me clueless i thought jpoles was 3/4 ..... so im not sure if its just a 5/8 or more ? ..... but i would like to know if i myself wanted a 5/8 over 5/8 antenna would i use a 1/2 wave phasing coil or a 1/4 ? if so whats best?
Szia István. Az illesztő tag távolsága az alsó antenna tagtól az mindegy, vagy arra is van egy képlet? Az alsó antenna rész és felső antenna rész között mekkora távolság legyen? Mert akárhol nézem a kiszámoló programokat ezekre nem igazán adnak mérvadó távolságokat. A hajlitott rész hossza 1/2 hullám hosszúságu? Hogyan tudom átszámolni pl 70cm re? Van erre képlet? Bocs a láma kérdésekért.
Great video thanks. Very nicely done. Are there any plans for this antenna available??
you have done i nice job look's good
Very nice design. I am sure by now that you have tried the antenna. How does it transmit/receive? I especially like the CB whip mounted on top. I just built a simple j-pole for 146 mhz. I plan on putting it up tomorrow afternoon. 73, KD8BET.
Nice
Thats awesome.. I love your design. Thats exactly what I want to put up.. what kind of distance can you get out of yours?
hi pityu... most mosques in our area have fm transmitters. they transmit lectures and prayers ect. it is a good system. however people living in lower areas cannot pick up signals. the transmitter runs on " 60 mhz to 70mhz". can you send a video on how to make an antenna for this
Isn't the co-linear J-pole supposed to be built from 1/2 wavelength elements over a 1/4 wave stub?
see this is what bothers me is it a 5/8 over 5/8... or a 5/8 over a 3/4... or 5/8 over a 1/2 ?... im alittle pickeled ..... question and would you count your stub the stub as one of of the eights of a wave ?? in his case 2/8ths this ?? since its a halfwave stub im just wondering how a 5/8 over a 5/8 6 meter 50 mhz antenna would be set up
It's great! How to see geometrical parameters your antenna? 73!
Dam nice work there radioman! Where are you?
I want one but my antennas never work out and i looked for them online but no one sold them
how about telling us the length of all the parts no one does that
Thankyou
Can you please give me the exact dimensions in metric of the antenna ? I want to try and build one ... Thank you.
I did not understand the first coil function, can you expand on this?
So you have plans on how you built it? I've been looking for some and really like your design. KJ6IRR
hello Pityu, from YO6PQM, nice work, put some sketch also please.
good
Is there a way you can send me a detailed measurement of the antenna?
Same as Bob!!..
Nice job where can i get your blueprint i want to build it the same way..
Pityukam ugyes vagy, de nekem a szep tulipan-os ladak tetszetek a legjobban.
Udv ARPAD ( VA3VAD ) Toronto-bol
quais as medidas da ante amigo gostaria de produzir uma aqui no brasil 73s PU7FTM
Do you have plans for it? I really like the design and would love to make one of my own. KJ6IRR
Would be willing to share your plans?
Can you contact me about this antenna? Ive been looking at jpoles and youre the only one that has a steel whip on yours..
time 2.22 you said conductor must be 1 half of the wave lenth meaning this would be 1 meter long yes
Yes, he said one half wave length.
That would be ~ (c/freq*vf)/2 = (299.8/145*0.96)/2 = 0.99 cm
Happy antenna building :)
What is the cb whip for?
Hello! You can use the same copper tubing for the 5/8 wave dipole part, the one I built from the CB antenna. I used the steel CB whip, cut to size, because it's much more lighter and more flexible than the copper tube. Just look for 5/8 wave 2m jpoles on the web. You'll find hundreds of plans, showing the same principle.
👍👍👍👏👏👌
Cati db are castig
you have to much time on hand
Dbd