Clean all joints with emery cloth and apply flux. Use a propane torch to sweat the joints together.
📐 Even a small deviation can spike your Standing Wave Ratio (SWR). j-pole antenna design pdf
If you’d like, I can also generate a or a printable one-page cheat sheet version of this guide. Just let me know! Clean all joints with emery cloth and apply flux
To build an effective J-pole, dimensions must be precise based on your target frequency. The standard formula uses the speed of light adjusted for the velocity factor of the material (typically copper pipe or 300-ohm twin-lead). Standard Formulas (in inches) 8856 / Frequency (MHz) Radiator Length: 5540 / Frequency (MHz) Stub Length: 2770 / Frequency (MHz) Spacing: ~2 inches for VHF; ~1 inch for UHF 2-Meter Band Example (146 MHz) Overall Length: 60.6 inches Radiator: 37.9 inches Stub: 19.0 inches Construction Steps If you’d like, I can also generate a
Assemble the antenna by connecting the radiator and reflector elements to the insulators.
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Provides a significant gain over a standard rubber ducky antenna.