I just successfully built an 11 meter j-pole with a long piece of 14 gauge insulated wire, an 8 foot piece of RG-58 coax, a small piece of PVC pipe with a whole drilled in each end as an end insulator, and a section of 450 ladder line.
I found a PDF on the Internet with the details for making a 10 meter J-pole for 28.400 MHz. I converted the dimensions for 27.205 MHz. It took me about 30 minutes to make the new calculations and build it. Next I hung it from a tree limb in a medium sized magnolia tree. I was expecting to tune an inch or two here and there to get the SWR right, but to my amazement the SWR on the first check was;
1.1:1 on channel 1
1.1:1 on channel 20
1.2:1 on channel 40
This is the original PDF design for 10 meters;
http://www.shadowstorm.com/cb/pdf/10mjpole.pdf
..and here are the new measurements for 27.205 MHz
Length of single piece of 14 gauge stranded and insulated wire = 17 feet 3 inches.
(I cut the wire longer than 17 feet 3 inches so I could twist the extra wire back around through the PVC insulator just like you do with the end of a dipole through an egg insulator)
Length of 450 ladder line matching section = 8 feet 2 inches. Be sure to short the two sides of the 450 ladder line together at the bottom end only.
Make the coax connection to the 450 ohm ladder line 7 inches up from the bottom of the ladder line.
For the RG-58 RF choke I used 6 turns of RG-58 coax at a diameter of 4 inches.
I built this antenna to talk to the locals since all my other antennas are horizontal polarization for skip.
I made a short Youtube video showing my home made J-Pole for the CB band for those that want to see it.
An easy and cheap homemade J Pole antenna for the CB Band
An easy and cheap homemade J Pole antenna for the CB Band - YouTube
Night Ranger/South Carolina 116 on sideband
I found a PDF on the Internet with the details for making a 10 meter J-pole for 28.400 MHz. I converted the dimensions for 27.205 MHz. It took me about 30 minutes to make the new calculations and build it. Next I hung it from a tree limb in a medium sized magnolia tree. I was expecting to tune an inch or two here and there to get the SWR right, but to my amazement the SWR on the first check was;
1.1:1 on channel 1
1.1:1 on channel 20
1.2:1 on channel 40
This is the original PDF design for 10 meters;
http://www.shadowstorm.com/cb/pdf/10mjpole.pdf
..and here are the new measurements for 27.205 MHz
Length of single piece of 14 gauge stranded and insulated wire = 17 feet 3 inches.
(I cut the wire longer than 17 feet 3 inches so I could twist the extra wire back around through the PVC insulator just like you do with the end of a dipole through an egg insulator)
Length of 450 ladder line matching section = 8 feet 2 inches. Be sure to short the two sides of the 450 ladder line together at the bottom end only.
Make the coax connection to the 450 ohm ladder line 7 inches up from the bottom of the ladder line.
For the RG-58 RF choke I used 6 turns of RG-58 coax at a diameter of 4 inches.
I built this antenna to talk to the locals since all my other antennas are horizontal polarization for skip.
I made a short Youtube video showing my home made J-Pole for the CB band for those that want to see it.
An easy and cheap homemade J Pole antenna for the CB Band
An easy and cheap homemade J Pole antenna for the CB Band - YouTube
Night Ranger/South Carolina 116 on sideband
