For the elements , I drilled holes through the beam and used bic pens as insulators then slid aluminum rods inside the tube, worked perfect, I learned building antennas since I was a kid living in Europe ,, if you added a V shape screen behind the antenna between the U bolt and the 1st element, it will increase db gain .. 90% of tv antennas in Europe use a V shape attachment to get the most signal ,repeaters are on mountain tops, and we just aimed our homemade antennas towards those repeaters that were 80 km away
Very nice workmanship. I usually cut pieces from a plastic cutting board to make the insulators. Very inexpensive at the dollar store and works perfectly. HTHs someone.
Hello Brian, I like the antenna you have made. I will have to make me one coming this week. Have yourself a Merry Christmas and a Happy New Year too. And many more to come for us both. Good day and Peace too. vf Would you be willing to sell the antenna you are not using Brian ?? Just let me know and we can do business Sir. Thanks
Very well made video, with plenty of insight knowledge. You don't give measurements, but you show how to calculate the measurements. Thank you very much.
You need to explain why you "cut" an antenna for a specific channel (19). VHF ranges from ch. 2 to 13 and UHF from 14 to at least 36. Your design just does not make sense.
Easy Grasshopper, you did an excellent job all except for one important thing. your Driven Element a.k.a Folded Dipole is off a bit needed to be positioned around the square .so that your signal passes from your directors through the center ~~0~~ of your Driven Element your missed half of the wavelength but for diy u did a awesome job for real thanks for the video
Could he remove and raise all elements maybe 1.5" ~ 1.75" t except the driven one so other elements are properly aligned? i.e. the driven element doesn't need to actually be around the square rail. Correct?
You want only one channel so you can make a coaxial balun cut for 503 MHz. Coaxial baluns are low loss but narrower bandwidth. For me they still work better for the whole band.
I stumbled across this video. I hadn't seen it before. It's great craftsmanship. Lots of questions. I believe you actually put this into use, how did you combine it to your other array? Did you have any problems with interference? When I first reviewed the video I thought it was a VHF design with the long directors. It would have been nice to see how well it did relocated. Really curious though how you combined it to your other antenna.
Brian, Great video but I'm confused on how you tested both antenna's if channel 19 was about 120 degrees off of the other group of stations? Did you point them both somewhere in between or did you move both antennas toward channel 19 as part of the test? And now that all stations are grouped, why not do another comparison between both to see which is better without the building as interference?
Truth and Quality Practical and Useful Information. Radio Electronics , November 1954 , pages 38 and 39. Has easy instructions to make UHF Yagi antenna.
Why didn't you include the measurements (lengths) of what you cut everything too? In ur video you say "here is all the raw materials" then the video skipped to drilling holes then "assembly". I guess my question is what are the lengths of everything?
Look at the dropdown in the description Additional links: Antenna design file - freezerdev.blogspot.com/2015/0... 4nec2 - www.qsl.net/4nec2/ nikiml's python scripts - clients.teksavvy.com/~nickm/sc... Optimized versions of the NEC2 engine - users.otenet.gr/~jmsp/
I need a single channe; VHF antenna for Ch.9; 186 - 192 MHz fully understand how it is done however I am medically unable. So the question is would you be willing to build same and ship it to me. I am wiling to pay all costs.
When drilling metal. Speed is a factor of size. You want to spin small bits as fast as you can, progressively slow down as bit diameter increases. lube liberally... enough picking nits... back to the free tv part.
In aluminum it's a little different, you want it fast as you can without causing the aluminum to melt into the drill bit, and even pressure will help it not melt.
Come on guys! It’s not high carbon steel! Yes The smaller the grill bit the faster the speed. But that’s only on harder materials. This is plastic and thin aluminum. It does not matter in this case.
I appreciate you trying to help people, but you are not a machinist. There are plenty of videos to educate about machining. Now I noticed you said that you should use the drill on the slowest setting. Well, that's simply not true. You need to vary the speed based off of the diameter of the drill. The bigger the drill, the slower the RPMs. There's other factors, material, feed rate, etc. But aluminum is like butter. I wouldn't be afraid to power thru that with that drill running at the middle or hi of rpms. Use the speed that's calculated to be most efficient
For the elements , I drilled holes through the beam and used bic pens as insulators then slid aluminum rods inside the tube, worked perfect, I learned building antennas since I was a kid living in Europe ,, if you added a V shape screen behind the antenna between the U bolt and the 1st element, it will increase db gain .. 90% of tv antennas in Europe use a V shape attachment to get the most signal ,repeaters are on mountain tops, and we just aimed our homemade antennas towards those repeaters that were 80 km away
Very nice workmanship. I usually cut pieces from a plastic cutting board to make the insulators. Very inexpensive at the dollar store and works perfectly. HTHs someone.
Hello Brian, I like the antenna you have made. I will have to make me one coming this week.
Have yourself a Merry Christmas and a Happy New Year too. And many more to come for us both. Good day and Peace too. vf
Would you be willing to sell the antenna you are not using Brian ?? Just let me know and we can do business Sir. Thanks
Very well made video, with plenty of insight knowledge. You don't give measurements, but you show how to calculate the measurements. Thank you very much.
The reflector should be 5% longer than driven element. The directors 5% shorter. All in all a good build.
You need to explain why you "cut" an antenna for a specific channel (19). VHF ranges from ch. 2 to 13 and UHF from 14 to at least 36. Your design just does not make sense.
Easy Grasshopper, you did an excellent job all except for one important thing. your Driven Element a.k.a Folded Dipole is off a bit needed to be positioned around the square .so that your signal passes from your directors through the center ~~0~~ of your Driven Element your missed half of the wavelength but for diy u did a awesome job for real thanks for the video
Could he remove and raise all elements maybe 1.5" ~ 1.75" t except the driven one so other elements are properly aligned?
i.e. the driven element doesn't need to actually be around the square rail. Correct?
Insignificant difference in performance.
You want only one channel so you can make a coaxial balun cut for 503 MHz. Coaxial baluns are low loss but narrower bandwidth. For me they still work better for the whole band.
I stumbled across this video. I hadn't seen it before. It's great craftsmanship. Lots of questions. I believe you actually put this into use, how did you combine it to your other array? Did you have any problems with interference? When I first reviewed the video I thought it was a VHF design with the long directors. It would have been nice to see how well it did relocated. Really curious though how you combined it to your other antenna.
I like the video but what are the measurements of boom elements etc???
Brian, Great video but I'm confused on how you tested both antenna's if channel 19 was about 120 degrees off of the other group of stations? Did you point them both somewhere in between or did you move both antennas toward channel 19 as part of the test? And now that all stations are grouped, why not do another comparison between both to see which is better without the building as interference?
Truth and Quality
Practical and Useful Information.
Radio Electronics , November 1954 , pages 38 and 39.
Has easy instructions to make UHF Yagi antenna.
Why didn't you include the measurements (lengths) of what you cut everything too? In ur video you say "here is all the raw materials" then the video skipped to drilling holes then "assembly". I guess my question is what are the lengths of everything?
Look at the dropdown in the description
Additional links:
Antenna design file - freezerdev.blogspot.com/2015/0...
4nec2 - www.qsl.net/4nec2/
nikiml's python scripts - clients.teksavvy.com/~nickm/sc...
Optimized versions of the NEC2 engine - users.otenet.gr/~jmsp/
Oh boy this dude has not answered a question in 8 years ... talk about trolling!
How did you optimize it? What were your start points? I am trying to design one with 4 directors, but I am not having much luck with it.
I wonder could this antenna also be a transmitting antenna? Not just a receive antenna.
Very nice looking antenna
I need a single channe; VHF antenna for Ch.9; 186 - 192 MHz fully understand how it is done however I am medically unable. So the question is would you be willing to build same and ship it to me. I am wiling to pay all costs.
I'm getting ready to build some VHF yagis, and might be able to build you one. If interested reply to rgboyd@yahoo.com.
@@rickboyd3857
Mohon kasi tau ukuran elemen dan spasinya 🙏
When drilling metal. Speed is a factor of size. You want to spin small bits as fast as you can, progressively slow down as bit diameter increases. lube liberally... enough picking nits... back to the free tv part.
In aluminum it's a little different, you want it fast as you can without causing the aluminum to melt into the drill bit, and even pressure will help it not melt.
Come on guys! It’s not high carbon steel! Yes The smaller the grill bit the faster the speed. But that’s only on harder materials. This is plastic and thin aluminum. It does not matter in this case.
I appreciate you trying to help people, but you are not a machinist. There are plenty of videos to educate about machining. Now I noticed you said that you should use the drill on the slowest setting. Well, that's simply not true. You need to vary the speed based off of the diameter of the drill. The bigger the drill, the slower the RPMs. There's other factors, material, feed rate, etc. But aluminum is like butter. I wouldn't be afraid to power thru that with that drill running at the middle or hi of rpms. Use the speed that's calculated to be most efficient
Hate to be a nitpicker but I was thinking the same thing. It's aluminum and it's a small drill bit, high-speed is good.
Well made video, to bad there was NO MEASUREMENT'S GIVEN ! From Peter M.
good job
nice video and very nice antenna.
73
Funny that you can design a yagi but not record audio without bad interference.