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Air Band VHF Antenna DIY
Things You'll Need
Twin-lead cable, 300-ohm, 65 inches
Coaxial cable, 50-ohm, 10 feet
Soldering iron and solder
Utility knife
Wire stripping tool
Coaxial crimping tool
Measuring tape
Electrical tape
Instructions
1.Strip the end of the twin-lead wire, exposing 1/2 inch of wire on each side. Solder the exposed wires together. This will be the bottom point of the antenna.
2.Measure from the solder point, and cut the twin-lead cable to 61 11/16 inches long.
3.Measure 20 9/16 inches from the solder point, and cut a 1/4-inch gap in the right twin-lead wire. Cut both the insulation and the wire.
4. Measure 1 1/4 inches from the solder point, and strip a 1/4-inch segment of insulation from both wires. Take care in keeping the wires intact. The feed line will be soldered to these segments.
5.Strip 1/2 inch of outer insulation from the coaxial cable end. Slice down the side of the braided sheath, and twist the braid into a wire. Remove 1/4 inch of plastic insulation from the tip of the inner copper wire.
6.Solder the coaxial twisted braid to the exposed wire segment on the right side of the twin-lead, below the 1/4-inch gap. Solder the copper wire to the exposed wire segment on the left side of the twin-lead. Wrap electrical tape around the coaxial cable and twin-lead to protect these solder points.
7.Crimp a connector to the free end of the coaxial cable that will fit the external antenna jack on your air band VHF receiver.
8.Cut a small hole in the insulation at the top of the antenna, and thread a piece of twine through the hole. Hang the antenna from this twine.
Tips & Warnings
Encase the antenna in PVC tubing to weatherproof it.
