Making a J pole antenna
Вставка
- Опубліковано 28 лип 2019
- A simple, easy and cheap home brew antenna project especially if you have some copper pipe offcuts to hand.
For the calculator and other interesting radio stuff see
m0ukd.com/calculators/slim-ji... - Наука та технологія
Your video is very helpful!
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Interesting that a plastic or metal mast fitting makes very little difference in operation. Just use and solder a "T" pipe fitting to add more pipe to attach to the mast. But as an interesting sidelight, it DOES create a comb of resonant SWR notches outside the operational frequencies as observed on an antenna analyser when using a very wide sweep. The metal mast does become resonant at some odd-ball multiple frequencies. VA7WN
Its a really good video and excellent wormanship will you ever do the second part people are asking not just me from the comments. The first part is very helpful so thankyou for that.
I had recorded a second part but unfortunately I’ve lost a lot of videos that were being edited. I’ll definitely start again and put up second part send/receive test.
u have a ton of old aluminum round stock from old antennas, can i use it to build a J-pole. i want to build one for the marine bands and center it around channel 16 (US Bands)
I’m no expert but I would say yes. You just need the velocity factor for aluminium when calculating the dimensions.
Where is the next part, the connector and testing the SWR?
Nice...how do you feed it?
With coax, about 2” (50mm) up from the bottom, centre on one side, braid on the other. You’ll have to experiment to find the exact point (up or down) to get 50 ohm match. (Video to come...)
Where did you find the 1/2" pipe clamps?
The white plastic pipe clips are a standard item so you’ll find them at any plumber supplies or diy centre.
Interesting that a 3/4 inch pipe strap will wrap around a 1/2 inch pipe to make an adjustable electrical connection with a brass bolt and ring lug. VA7WN
Why doesn't anyone show themselves soldering the solid copper onto the coax connector?
This is just a simple video showing the straight forward construction. The feed point of the coax needs to be adjustable initially (up or down) when tuning the j pole so I haven’t attached the coax in this video. I will make another video of tuning which is when you’ll see the coax attached.
O que mais me chama atenção nesses videos gringos é que as pessoas têm acesso as mais variadas ferramentas. Algo impossível de encontrar aqui no brasil e, quando encontramos, elas custam verdadeiras bagatelas.
País desenvolvido é outra coisa.. ainda vivemos nos anos 60 aqui no Brasil em se tratando de tecnologia. É lamentável.
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Sorry to here that. There are other ways to make a j-pole antenna, with other materials and less tools.
@@EvansBoatwork j-poles work on short circuit.. is it safe for the radio ?
@@attilarivera It’s a very well know and used antenna design.
@@EvansBoatwork I think I will study more about these kind of antennas. Thank you very much Mr Boltwork.
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Olvidaste poner la T entre los dos polos
Did you test it?
Will post a video when I do...