Tripod for ground stake vertical ham antennas
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3d printed center hub and feet for use with PVC pipe to add a tripod to telescopic ham vertical antennas with spike base
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Add a tripod to a ground spike vertical ham antenna. This allows use on difficult surfaces such as rocky soil, frozen ground or paved surfaces. It also allows use in parks which prohibit disturbing the ground. The tripod uses PVC pipe for the legs. The legs have threaded plugs which are glued into the ends of the pipes, The legs screw into sockets with matching treads in the center hub. Feet with holes for tent stakes are glued into the other end of the legs. There is a vertical hole in the center of the hub. The ground stake is simply inserted in this hole.
Printing
Print with PETG. PLA probably would not give a good result. It is more brittle than PETG and thus easier to break. PETG is also less likely to deform from heat when stored in a hot place such as your car. I used ".020 mm Strength" which resulted in 6 wall loops, 25% infill.
PVC Pipe
There are model files for three different pipe sizes--1 inch schedule 40, 1 inch SDR21 (a thinner wall pipe readily available at U.S. big box DIY stores) and a metric size which chat GPT says is popular, 32mm O.D. x 27.2mm I.D.
Assembly
Cut the PVC pipe into three pieces of the desired length. Remember the antenna is about 18 feet high and the telescopic sections of the antenna are made of very thin walled tubing. The antenna is fragile. It is easily damaged should it tip. Longer legs will help prevent this. I used hot melt glue and it worked well. I didn't try any other adhesives. Glue the threaded plugs into one end of each of the pipes. Be sure to cement the threaded plugs first so that the feet can be properly oriented. Apply a generous amount to both the inside of the pipe and the outside of the plug. Insert the plug and twist to spread the glue. Screw the legs firmly into place in the hub, then similarly glue the the feet into place, aligning the hole in the foot vertically.
Files
Three sets of files are provided for use with 1 inch Schedule 40, 1 inch SDR21 (thin wall), and 32mm O.D.x 27.2mm. The metric files are in .step format for easier editing.