Here’s an economical dipole for simple QRP HF homebrew rigs. It’s a one-piece radiator/feeder arrangement made of surplus insulated telephone drop wire with twin copper-clad steel cores.
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| Low Cost ½ λ Dipole |
The cores are separated to get the λ/2 radiating length and then tied together with string to arrest further separation.
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| Telephone Drop Wire |
The string could be done away with, and the λ/2 length yet maintained, using the reliable 'Underwriters Knot'.
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| Underwriter's Knot |
The end insulators are scrap bakelite pieces, drilled to take the wire and string. Banana plugs are used at the rig-end.
Works real good when strung high up between two trees or other supports.
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