Twin Lead J-Poles |
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Make a roll-up J-Pole antenna. These are made from 300 ohm twin lead (old style TV lead in wire). Make several to carry in your Go-Kit, in your car, etc. Making these J-Poles makes a good project for your radio club. |
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Strip the bottom 1/2" insulation off each side of the twin lead. Solder the leads together. Measure up from the bottom to the first dimension and strip off the inslation from both sides of the twin lead, this is where the coax will attach. Measure the next dimension, on the right side cut a 1/4" gap into the wire (cut the wire into on the right side). This is the quarter wavelenght side. Measure the final length, this will be the half wavelength side, cut the twin lead. Connect the coax on the bottom section, the center conductor of the coax will go on the long side (left) and the outside of the coax will terminate on the short (right) side. It is now time to check the SWR. If it is not less than 2:1 you will have to adjust the position of the coax by moving it up or down. You should only move it about 1/8" at a time. Remember to check at the portion of the band you will be using. |
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