"J" type antenna production ----- "j" antenna

Keywords: "j" type antenna The J-pole (J-POLLE) antenna consists of a 1/2 wave emitter and a 1/4 wave driver matching, which is equivalent to a dipole antenna driven from the end, because its conductor is a J-shaped, said For J poles. Right Figure A is an example of a J pole antenna, B is a J pole antenna (suitable for high power) with a copper wire or copper tube having a diameter of 3-10 mm. Be Here is a method of making "J" type antennas under amateur conditions for enthusiasts. Be First, you can buy the following materials from the refrigeration equipment maintenance store: 10mm refrigerated copper tube 3.5m; supporting a U-shaped elbow. Reference price copper tube: 4 yuan / m U-elbow: 2 yuan / month Be Be Let everyone look at how the U head and copper tube are connected. Be Be Then, the inner and outer walls of the copper pipe and the inner wall of the U-head. (Recommended first in the fine sand skin, apply flux, use high-power electric soldering iron Be Be Then use the gas welding or gas stove welding: insert the copper tube that has killed tin into the U head, while heating in the gas stove, letting all melt, adjust the angle, close the stove, let the copper tube and tin naturally cooled. (Be sure to pay attention to safety) Be Be The feed point portion of the welded antenna uses a feeder and M-seat welding with a section of 50-5. Be Be Complete joints and nodes Be Be Do a good job, if you think is not good, you can also use another copper tube and a U head to improve the gain. Be Be Note: The core wire is shorter than the lightning protection!

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