Making a dipole antenna
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- Опубліковано 20 сер 2024
- For some time I wanted to construct an antenna that could be used for both civilian and military radios on multiple frequencies. Having a way to attach and detach the antenna elements can help using this antenna in multiple bands and it makes a perfect mobile antenna that can be hoisted from the center using poles or by paracord from a tree or building. Thank you to all who help me get this project on the way. The Ham community was very helpful to me especially with the soldering part of it.
Update 14 December 2021
I have made three separate leads (antennas) to operate at 6 Meter, 10 Meter and 20 Meter all with a low SWR (about 1.3). I might make a video making the 40 Meter elements.
I realized that finding the PVC parts can be challenging in some areas. Thanks to one of the comments (Frank) here are the links to get the PVC parts if you are interrested. I am not affiliated. Just want to help you make your build easier.
Tee 1" 1" 1 1/2"
www.supplyhous...
Plugs 1"
www.supplyhous...
Bottom Plug 1 1/2"
www.supplyhous...
I would love to see your build.
Update October 2023
The dipole has been working great. It has survived 2 winters in Northern NY and I will be setting it up in Florida.
Good evening SR. , i pass my general license on April 2023 and tomorrow am going to build my first 20M dipole antenna using your video as reference , this is a amazing work of art ,cant wait to do it , thank you!!
Great news George. I hope to catch you on the bands. Have fun with your build.
@@jeanburgos3416 i hope too Sr. 73
Seconds into the video, as soon as I saw you start assembly, I thought 'He's military...'.
It showed in your desire to exact perpendicular holes and exact centered location. That indicated the military training for precision. In all things. Most people wouldn't concern themselves. Except maybe engineers...
I'm just getting into this radio stuff, so Thanks for the great info!
Thanks Mike, it is really fun stuff.
Beautiful build, lot of fun, and extremely satisfying,,,that, will last forever,,,,GREAT vid,,,de NV1H😎
I see your ROUND BROWN in the background. I too was a Drill Sergeant from 1989 - 1991
KX4VET
"I AM A DRILL SERGEANT"
Best job I ever had! Thank you for your service and the many boots you helped develop.
@@jeanburgos3416 likewise! You stated you were from PR, what part of the island? I am Cuban but Lived and graduated HS in Luquillo, PR and enlisted in the Army in Fajardo. Currently living in Miramar, Florida. I subscribed to your channel. Keep the good videos coming. Best wishes!
@@o.m.6236 from Bayamon, PR
I was an Army recruiter in Carolina Recruiting Station
Thank you. Very interesting. Most useful. I shall build one. Phil🇬🇧
Happy Memorial day and thank you for your service.
Very nice video First Sergeant. Your methodical work turned out a very nice product. I will follow this design in creating my next dipole. The next step might be to incorporate a simple 1:1 balun into the center insulator to balance the dipole with the unbalanced coax. This would help to avoid common mode currents and potential EMI and the related disrupted radiation pattern. Adding the balun may require a larger T-connector depending on the size of toroid and related RF power rating.
I just use the eyes on the end as strain relief and element connection, eliminating half the connections.. Just get them long enough to use a wing nut on them.
Nice Job, from one Senior NCO to another. I also serve as a Drill Sergeant 88 - 91 Ft. Sill Oklahoma.
Thank you Richard!
Well designed, well constructed. This antenna would be imposable to implement without a center support. If it were any heavier you will need a crane to lift it. when going to all the trouble you have for this you should incorporate a 1:1 balun. To help combat connection corrosion a small amount of conductive grease could be used where your spade connectors join to the bolt and nuts. Don't forget a tiny weep hole on the bottom adjacent to the coax connection. Overall I enjoyed the video you have done fine job. Wes - KF7BWS. P.S. you have made it very easy to change elements and the center support should last a life time.
I build a 1:1 balun used near the base/ radio. Building the balun was super fun to do. I also built a 49:1 for homebrewed end fed. The antenna survived the NY winter. No issues at all
Signal Corp Pin. %th Sig 69th Battalion 534th Signal Company. Augsburg Germany Thanks for the video,,plan on getting the materail to build my own,
Is there a way you can make a shortened video maybe 1 or 2 minutes to just show where the wires go. its making me crazy to watch a 25 min video and having to figure out how its wired. I see a couple videos online with the antenna wire connector and 2 other external connectors. your idea has 4 external connections and im trying to figure out why.
Hey man .. Well done! :)
You have same pictures and wooden thing as my son does....lol he was ft.Drum 2012-16. I'm making the same center. I have seen both of the dudes videos you thanked. And now your.... making mine same exact way. Also putting a few ferrite bead snap on's, on the coax. I could also put a 5 wrap choke in the coax, tape it on a empty fishingspool...🍺. I'm going to measure parameters with and without the choke and beads. See if it really makes a difference...
Brilliant! Think about how your going to pull it up. I have it on a painter pole, and one side bumps against the pole. Maybe putting the bolts in a different spot.
I was hoping you would’ve shown how you tie the actual transmitting wire on the D-Ring before the soldered connector attached to the lug
Because when you pre-cut the wire for each leg , let’s say for 80 meters which is in the ballpark of 61 feet , well , no one ever explains to a rookie , does that extra 5 inches of strain relief tied to the D-Ring fit into the 61 foot length equation ? Also , how about the other end , when you’re wrapping it around the 550 cord which I will be using , folding it back onto itself and wrapping it to make it secure , making it shorter , does that change the resonance of the antenna also ?
I’ve recently taken an interest in building my own 80 and 40 meter dipole . I have purchased a lot of material and wire , even a good Rig Expert analyzer . But before I get started I’d like to know if I need to cut the wires longer and trim as needed ? Or is wrapping the wire at the end around itself going to shorten it in the eyes of the analyzer ? And what knot type do I use at the D-Ring end ?
Great video too . Thanks for the ideas . That looks really great
Maybe we will cross paths on the bands . Thanks for your time served in the Army 🫡
I served in the Marines 1993-1997
KK4ISW
Agree, get out there an tinker. Formulas are a ballpark estimate. The actual length will depend on many factors. λ= v/ f To tie the wire I just used a clove hitch on the D ring, nothing special. Leave it long enough to adjust (short/long). This is where having and antenna analyzer comes in play.
@@jeanburgos3416
Ok 👍 I appreciate it man and I look forward to trying it
I’m getting ready to lower my 40 foot tower to make some changes to my beam antenna, when it goes back up , I gonna put a monoband dipole about 38 foot up on a bracket and replace the triband 20-40-80 that’s on there ,. It does ok but I’m gonna build a monoband for each band that I talk on the most
Thanks for the reply Sir
Stop by my channel sometime in the next few weeks . I’m still in the prep work stages of redoing my antenna setup
I’ll post a few short videos over the next couple months
That is a n looking connector
Can I use a tee with threads so I can use threaded plugs? I can’t find certain parts here in Ontario.
Hi Jay, I ran into the same issue. I ended up purchasing what I needed on this website www.pvcfittingsonline.com/ not sure if they ship to CA. Keep in mind, that it does not have to be a Tee. You could use two end caps and a piece of pvc pipe to seal it. I also like this design ua-cam.com/video/GhZYgASVZZA/v-deo.html have fun building. Make a video of your project. I would love to see it. Jean
@@jeanburgos3416 thank you good sir! 73
It looks like there is an option for Canada. Again, much appreciated, thank you!
Did you ever do any time at the 10th MTN DIV?
Yeah, I finished my time on Fort Drum. 10th CAB and 10th Mountain Division G6
31K
What size pvc is used, I could not find the size (perhaps 1")?
Hi Frank, great point. The size of the top are 1" and the bottom was 1 1/2" but you can use whatever size you can find. The hardest thing to find was the bottom cap. Here is the link www.supplyhouse.com/sh/control/product/~product_id=449-015. I believe the two plugs were 1". The idea for the bottom being bigger helps with the bulkhead connector. Here is the link for the Tee www.supplyhouse.com/sh/control/product/~product_id=401-133. Here is the link for the plugs www.supplyhouse.com/sh/control/product/~product_id=449-010. It was really hard to find these at my local hardware store so I went with this online store. I hope this helps. Share your build when you are done. Jean
So if the resistance of a dipole is 72 ohms, how do you match it to a 50 ohm transceiver?
Hello Charvester, thank you for that excellent question. Although true that the dipole is 72 ohms, this is hardly the case in practice since the antenna sits 1/2 wavelength from the ground. BLUF: There is no need to match it for me since I am feeding it with 50-ohm cable. There are many variables that could affect this. My antenna is a trap dipole for 20/40 meters and it works on those bands without a tuner. I hope that helps.
you can go about it several ways: a) feed with 50ohm coax and loss about 3%. b) feed with 75ohm coax and c) use the dipole as inverted V and it will get you close to a perfect match at 50ohms.
Guessing you were not a 31C.
No, I was a 31L. But those are super old terms and no longer exist. You now have 25 series for comms. And the 31C/25C is also gone.
@@jeanburgos3416 LOL, dating myself, enlisted as a 05B, by the time I got to AIT 05 series was changed to 31, and I was now a 31C.
What is the name of your drill hole tool?
Hey bud, you can find it by searching for drill guide on amazon. I hope that helps.
Got it! Much thanks!@@jeanburgos3416
Way too much work. Take an ordinary plastic electrician box, place the balun, connector etc in it. Wing nuts on each side for the poles of the antenna. A piece of PVC pipe a bit longer than the box width, drill 2 holes on each end, loop the antenna wire trough the holes and attach the pigtails to the box. That's it.
There many ways to build an antenna friend. Some of us enjoy the process. Thanks for watching.
Your method might be easier, but I think Jeans way results in a sturdier center insulator.
@@Mitch62918 He is using a PVC T pipe, I'm using a PVC pipe so ...