Build Your Own Coils Phil Salas – AD5X Introduction I really enjoy experimenting with different ways of making portable and mobile antennas. However, one big problem is finding reasonably priced coil stock. Recently I’ve been making my own coils and so I wanted to pass on my methods. Also described are neat ways to build coil supports for your home-made air-wound coils. The Coil The basic form for the coil is 2” PVC pipe. I start with a 1-foot length of pipe, and carefully mark four evenly spaced lines along the length of the pipe. See photo “Marked Pipe”. To this PVC pipe, I tie-wrap four pieces of nylon edge trim available from McMaster-Carr (www.mcmaster.com, PN 85085K8, $10.50 for 25 12-3/4” strips). This nylon edge trim provides the support to provide for an 8-TPI coil. I used 14 gauge copper wire for the coil itself (McMaster-Carr 8873K51, $10.20 for 80-feet). ….
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