Very nice construction practice!! I am wondering how you calculated the element lengths, are the full wavelength.from section to section for proper phasing of polarties? Also how was the impedience calculated for 300 ohms?? Thanks
The question of impedance has a very involved answer, in short,. Most antennas we use are balanced ( two active sides ) of 75ohm each side feeding into 75 ohm ( unbalanced ) coax cable, combined by a 4:1 transformer. By convention all dipoles or balanced antennas are 300 ohm. The subject is very complicated.
Wavelength ; λ = v/f Or use this handy calculator to find a wavelength of a particular frequency, www.omnicalculator.com/physics/wavelength#wavelength-formula Scroll up for calculator.
The mounts I use are simple electrical conduit clamps available at most hardware stores, Lowes, home Depot. They hold very well and are perfect for a vertical antenna mounted on a conduit mast . Send me an email Cosmic222@protonmail.com And I'll send you a pic if you want.
Thanks for your quick uploaded. I have a roll of mesh similar to this that I used to keep birds out of my chimney. Little bit tighter. Most of what I've seen simply use straight horizontal rods. Is the mesh all that critical? Also the 4.5 inches was the info I was looking for. How critical is this? Does the signal strength simply drop if it's not correct? Was thinking I could get this pretty slim by just using the back bone you did the other day. Put the entire antenna in some kind of box ( foam board etc... ). I'm only 21 miles from the Sears Tower as I indicated yesterday, maybe don't even need the reflector.
Thanks, glad I could help. Mesh or grid from 1/4" square up to 2"x3" works fine. The reflector rods do a good job but are difficult to incorporate into the layout. I believe the grid or mesh gives more signal return thus a more stable picture. The setback measurement of 4.5 " for the hoverman seems to be what works best. I have experimented closer 3", 2" and lost the signal. Also tried 12", 15" and 20" the 15" worked well but is impractical. It's a matter of keeping the signal in time or phase as it bounced off the reflector at almost the speed of light. Too close or too far cancels the signal out. The element alone should work fine at 20 miles saving you some work. Only thing to do is try without then with a reflector. Get a TVFOOL.COM report to see if you have signals from other directions, sometimes too many signals from too many directions cancel each other out and a reflector will block interference out of the target bearing. Keep up the good work you're on the right path...M
@@cosmicantenna9244 Would making the reflector wire out of bronze or copper and soldering the wire together at say 2 X 3 inches rectangular size or a little smaller work ??? I do not worry about the time it will take as I would like the look of shiny metal look. The wire would be 1/16 inch diameter size. Would you think that will be O.K. for the antenna ??? I plan to use the Gray-Hoverman type. Also, I would need to make two antennas since where I am located stations are located 180 degrees apart roughly. Would that cause any problems for reception ??? Thank you Mr. M. for giving me an education on antenna making. Any other pointers would be appreciated Sir. Peace vf.
You can make a reflector out of any metal you have. The thing is the weight of the finished antenna. Up in the air on a mast the wind loading on a heavy antenna would be increased. I try to keep the builds between 4-8 pounds for easy handling and stability in the air.
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Very nice construction practice!! I am wondering how you calculated the element lengths, are the full wavelength.from section to section for proper phasing of polarties? Also how was the impedience calculated for 300 ohms?? Thanks
The question of impedance has a very involved answer, in short,. Most antennas we use are balanced ( two active sides ) of 75ohm each side feeding into 75 ohm ( unbalanced ) coax cable, combined by a 4:1 transformer. By convention all dipoles or balanced antennas are 300 ohm. The subject is very complicated.
Wavelength ; λ = v/f
Or use this handy calculator to find a wavelength of a particular frequency,
www.omnicalculator.com/physics/wavelength#wavelength-formula
Scroll up for calculator.
Another awesome video :) thank you for the info. I couldnt trouble you with asking where you got them mounts from could i ?
The mounts I use are simple electrical conduit clamps available at most hardware stores, Lowes, home Depot.
They hold very well and are perfect for a vertical antenna mounted on a conduit mast .
Send me an email Cosmic222@protonmail.com
And I'll send you a pic if you want.
Thank you, i appreciate it! I will email you.
Thanks for your quick uploaded. I have a roll of mesh similar to this that I used to keep birds out of my chimney. Little bit tighter. Most of what I've seen simply use straight horizontal rods. Is the mesh all that critical? Also the 4.5 inches was the info I was looking for. How critical is this? Does the signal strength simply drop if it's not correct? Was thinking I could get this pretty slim by just using the back bone you did the other day. Put the entire antenna in some kind of box ( foam board etc... ). I'm only 21 miles from the Sears Tower as I indicated yesterday, maybe don't even need the reflector.
Thanks, glad I could help. Mesh or grid from 1/4" square up to 2"x3" works fine. The reflector rods do a good job but are difficult to incorporate into the layout. I believe the grid or mesh gives more signal return thus a more stable picture. The setback measurement of 4.5 " for the hoverman seems to be what works best. I have experimented closer 3", 2" and lost the signal. Also tried 12", 15" and 20" the 15" worked well but is impractical. It's a matter of keeping the signal in time or phase as it bounced off the reflector at almost the speed of light. Too close or too far cancels the signal out. The element alone should work fine at 20 miles saving you some work. Only thing to do is try without then with a reflector. Get a TVFOOL.COM report to see if you have signals from other directions, sometimes too many signals from too many directions cancel each other out and a reflector will block interference out of the target bearing. Keep up the good work you're on the right path...M
@@cosmicantenna9244 Would making the reflector wire out of bronze or copper and soldering the wire together at say 2 X 3 inches rectangular size or a little smaller work ??? I do not worry about the time it will take as I would like the look of shiny metal look. The wire would be 1/16 inch diameter size. Would you think that will be O.K. for the antenna ??? I plan to use the Gray-Hoverman type.
Also, I would need to make two antennas since where I am located stations are located 180 degrees apart roughly. Would that cause any problems for reception ??? Thank you Mr. M. for giving me an education on antenna making. Any other pointers would be appreciated Sir.
Peace vf.
You can make a reflector out of any metal you have. The thing is the weight of the finished antenna.
Up in the air on a mast the wind loading on a heavy antenna would be increased.
I try to keep the builds between 4-8 pounds for easy handling and stability in the air.
@@cosmicantenna9244 Thank you Cosmic Antenna for letting me know some usable facts on antenna making.
sir can I use a statilite dish as a reflector with Panel antenna for wifi? answer me please 🙏🏼🙏🏼❤
For wifi I have no idea.
The shape of a satellite reflector concentrate the signals generally to the center or close to it.