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Antenna Theory jpole


Antenna Theory jpole

Another approach to the problem is the J-Pole" antenna, in this design, the antenna is elevated at least 1/4 wavelength above ground, thus eliminating the ground losses and "normalizing" the radiation pattern. The Impedance matching between the low impedance feed line and the high impedance of the end of the dipole

post 06 Dec 2024


Antenna jpole Links

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2 meter J-Pole
Cut the tubing to the size shown for the desired band. The only section where size is not critical is the mast section. Use any size you desire for mounting purposes

2 meter Aluminum Slim Jim Antenna
The Slim Jim is generally characterized as an end-fed vertical folded dipole. As with all end fed dipoles some sort of impedance matching is necessary to keep the SWR down

3 meter Slim-Jim Antenna
The gamma match consists of a 150mm length of 10mm aluminium tubing

Project antenna for 2 meter
The gamma match consists of a 150mm length of 10mm aluminium tubing

A slim antenna for vhf band
To build it I use pieces of 450 Ohms leader line approx. 154cm, a PVC tube approx. 200cm, rope,SO-239 female connector, RG-58 about 1,5meter


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