How to make the “J”type antenna

J-pole (Jplease Click hereto get our dipole antenna

-Pole) antenna consists of a 1 / 2 wave transmitting element and a 1 / 4 wave matching device driver structure, which is equivalent to a dipole antenna driven from the end, because the conductor was a J-type, so called for the J-pole. A right is an instance of a J-pole antenna, B is 3-10mm diameter copper wire or copper production of the J-pole antenna (for power).

Here's an amateur production under conditions of "J" antenna method for enthusiasts imitation.

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   First of all refrigeration equipment repair shop can be bought from the following materials: 10mm cooling copper 3.5m; supporting U-shaped bend.
   Price Brass: 4 yuan / m U-shaped bend: 2 yuan / month

And then use gas welding or welding gas stove: the sugar into a brass tin U head, while the gas furnace heating, so that all the melted tin, adjust the angle, turn off the stove, brass and tin for natural cooling. (Be sure to pay attention to safety)

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Welded good antenna feed point some useful feeder and a 50-5, Block M, welding.

please Click hereto get our dipole antenna

Do J antenna, if that effect is not good, you can use another piece of copper pipe and do a U-equivalent to the first part of increased gain.

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