J-pole Antenna Design Pdf -
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| Problem | Likely Cause | Fix | |---------|--------------|-----| | High SWR across band | Stub length wrong | Adjust shorting strap | | Narrow bandwidth | Too thin conductor | Use larger diameter tubing | | RF in shack | Missing choke | Add ferrite balun |
This is the most critical adjustment. The center conductor of your coaxial cable connects to the , and the shield connects to the Matching Section .
Target Frequency: 146 MHz (Middle of the band)
Building a "Copper Cactus" J-pole is the most common DIY approach due to the durability and availability of copper plumbing pipe.
Calculate the radiator and reflector lengths based on the desired frequency and wavelength.
| Problem | Likely Cause | Fix | |---------|--------------|-----| | High SWR across band | Stub length wrong | Adjust shorting strap | | Narrow bandwidth | Too thin conductor | Use larger diameter tubing | | RF in shack | Missing choke | Add ferrite balun |
This is the most critical adjustment. The center conductor of your coaxial cable connects to the , and the shield connects to the Matching Section .
Target Frequency: 146 MHz (Middle of the band)
Building a "Copper Cactus" J-pole is the most common DIY approach due to the durability and availability of copper plumbing pipe.
Calculate the radiator and reflector lengths based on the desired frequency and wavelength.
