DIY Home-made 4G LTE 850 MHz Yagi-Uda antenna
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- čas přidán 20. 08. 2024
- My first simple attempt of creating an antenna to bost the signal of my mobile internet connection. At the countryside, were I live, the cell tower uses 850MHz for the LTE connection. Antenna was created with the help
www.k7mem.com/A... antenna calculation script by Martin E. Meserve and my constructed antenna seems to perform according to specs. Tools and materials I used was the Proxxon PD400 lathe and some aluminum rods.
Ba ba Bam bam bambad pedum ba background song is amazing... It is from any Oscar winning movies??..
Just a follow up comment, I used these antennas for the following 7 years, summer, rains, winter, snow-storms. I had no issues what so ever and they did greatly improved my bandwidth and this especially on the up-link side. Well balancing could have been an issue but I didn't see any side effect of it at all by not doing so. The modem survived all the years as well.
Theme song, boom-badoom boom. Productivity coefficient - happiness, contentment, connectivity to humanity. Beautiful work.
I noticed that in 6:40 crimping at 90 degree may be closer to the boom and for sure easier is to clean the cable 10:10 with opposite side of the cutter. Nice workshop.
good job with the DIY .nobody has those types of tools/machines to do that at home
best part is the background music..
That answers all my questions. Thank you for your time!
Awesome job, just awesome.
Good-looking antenna. Just some questions though:
1) how do you find the impedance of the antenna and match it the coaxial RG174, which i presume is 50 ohms?
2) How come you did not attach a balun to coaxial, unbalanced, before connecting to the dipole, which is balanced? My professor said it is necessary to add one to make sure to eliminate the current on the outside of the cable?
deathheavens Yes, I agree on all your points. The cable is 50ohm as you said and if you gonna do this by the book (or as your professor states ;) ), you should measure the impedance of the antenna and then as you said complement the construction with the right balun. Unfortunate I don't have the necessary equipment to do so (best is to use a vector analyzer I guess) and I took the chance instead and tried out the antenna and it turns out to work rather good anyway without the extras. It seems to work according to specs, and now I have around 20-30mbit/s both directions.
Just two questions:
1, Where did you learn to sing/hum, and
2, did you get your money back ;)
Haha
good precision !!!!
Home-made as if we all have 100 grand worth of tools at home
I didn't see 100 grand worth of tools there. Maybe a grand. But ok. He lists the lathe he uses, and I haven't checked it but seeing how a CNC turning center with a live tooling attachement for the turret is less than 100 grand...I'll just assume.
Hi, really nice and well made video. I would just like to ask what software did you use to measure the dBm?
+Kasetti 55 Well, that was not made in any greater detail, I just used the modem connection-software that info the signal-level.
FEEDER MATCHING ! - Go back to Martin E. Meserve's yagi calculator website, and look for the coaxial cable impedance matcher calculator, that uses a 300 ohm folded dipole for the driven element - www.k7mem.com/Electronic_Notebook/antennas/yagi_vhf_feed.html
FYI Film4Music, His calculator also caters for insulated elements from metallic boom, elements electrically connected to metallic boom, and non-metallic boom options.
-Thanks for the matching tip, Paul. I also realised I stumble upon the calculation script page from the wrong webadress, and good you stated the right one in your comment. I now have changed the adress at top to justify credit to the rightfully owner of that page. Hope you liked the antenna video.
Magnus Hummelgård I did like the antenna video! - It's good to see people who've got the right equipment (lathe with drilling att. etc.) and know how to use it to make what they need, and I enjoyed what sounded like faint speeded up humming from the Operator, who appeared to be doing a great job of construction.
I was refering to the boom. You made it from aluminium with contact to the directing elements. I have seen designs with a wooden boom or made on pexiglass. Is there a big difference there?
yes exactly, if you have a boom of metal suporting your directing elements u get diiferent spacings/lenghts to compensate, if boom is also in electrical contact with the elements then that also needs to be compensated for. But that is so far my own knowledge goes for that topic. If you do the calculations manualy I guess it will be easier if the boom is non-metallic and therefore don't interfere with the electric fields around the antenna. I choose metall out of two aspects. first durability, my antennas are located in directed sun light (usually kills plastic) most of time together with heavy winds. secondly I like to work with metals rather than wood/plastic.
Thanks
Hi, thank you for the video. The antenna looks perfect. I would like to build an antenna for my wireless microfone in the band 626-668 mHz. Comercial antennas are wideband log periodical. Do you think if I need narrow band and high gain, I could be better with a Yagi?
I think the log periodic is designed and best used for a wide band, if you need max gain I would go for the yagi especially if you only have that small freq. range as you describe.
Good Day Dude.... how can I set up that machine you've used. I'm Planning to build one of those. thanks
+Gero Egreoj Not sure what you acctually mean, set up and configure the antenna to your router or how to use a lathe? Former: your 4G modem needs to have external antenna connector, later: a lathe is not critical for building a antenna, I just like to find opertunites to work and use them in my projects.
machine that you used to build antenna is what I mean sir. I'm also making yagi antenna. But I only use drill without drill press and it gives me hard time to build one when it comes to precise drilling from side to side (i'm using circular aluminum tube with 18 mm diameter).
By a lathe for just making an antenna I wouldn't reommend, would be cheaper to just by the antenna in first place. If I was you I would improvise by building a drill jig in wood to support drilling and increase precission.
+Magnus Hummelgård oh fyi, i'm planning to produce volume of yagi antenna and making it a business. I already made 4 of those and sold for $ 126 each. I install antennas for modems and houses far from cell sites that 3g network can't reach. I'm planning to make it a business after I finish my contract here in abroad. Anyways thanks.
+Gero Egreoj OK now I see, anyway the lathe is a proxxon PD400 with mill attachment: www.proxxon.com/en/micromot/24400.php
Thank you for your answer. Just one more question, I started to learn about Yagi to hiild one prototype but I can not tell the difference between having a metallic middle pole contacted to the directing elements and those design that use non metallic elements as structure. Which one is the real thing?
I don't understand exactly how you mean. If the support structure is of metal and if it is also in contact electrically with the directing elements then that will have an effect on the antenna design and you need to compensate for that. -I'm no guru on this myself, but I think it still counts as a Yagi.
Film4Music Both are the "real thing" ! ...they 're just different options. - see my comment and URL above for details - Cheers Paul
without soldering the coax on radiator is OK?
Nice work. What is the model of the lathe with drill press? Tnx
It's a Proxxon pd400, www.proxxon.com/en/micromot/lathe_and_milling_systems.php
Hello friend do you sell antenna 4g ? i'm looking for one antanna 30 dbi !!
Thats not homemade, I have not that kind of tools in my home.
Yes indeed wait a minute I will get my lathe outside in the barm. If I can afford a lathe I surely can get buy an aerial.
omg for all the people saying you need expensive tools use you`r heads.
home made? workshop required with lot of stuff...
صراحتا كلشي مدا افتهم من كلامك
How is this a diy?.where the fuck will I pull a lathe out of?
so, all i need for a 70 bucks antenna is a 150.000$ machines and equipment, good idea, i'm gonna do this. (sarcasm) and thanks to let us know u own a jeep, i hope they give u something for that...