Antena J Pole 2 Meter Band

Constructed using 1 2 cooper pipe all welded swr is 1 2 146 mhz and less than 1 5 across the entire band.

Antena j pole 2 meter band. Home made j pole antennas for six meter band 50 mhz category is a curation of 14 web resources on j pole antenna for 6 meters j pole antenna for your packet radio station j poles. Dave s j pole antenna calculator. Dollar for dollar the kb9vbr j pole antenna may be the best value on the amateur radio antenna market. On most of the j pole designs out there a choke should be used as close to the feedpoint of the antenna as possible to help prevent rf on the feedline and creating difficulty with swr readings.

Wide bandwidth 4 mhz across the 2 meter band. Omnidirectional rf radiation pattern is balanced for communicating with stations at or slightly above the horizon line. Jan 15 2019 explore jafitek s board j pole antenna on pinterest. No need to retune.

Each antenna is individually tested and tuned for optimum performance on their respective bands. United states restricted mode. Enter your desired frequency and get the calculated lengths from below. This is a j pole antenna cut for the 2 meter amateur band.

Measurements and simulation confirm the quarter wave stub modifies the circular h plane pattern shape increasing the gain slightly on the side of the j stub element and reducing the gain slightly on the side opposite the j stub element. Pretuned and ready to go for the 2 meter amateur radio band. For example if you wanted a general j pole for 2 meters you might enter the center of the 2 meter band which would be 146 00 mhz. It s very very well matched across the entire 2 meter ham band.

J poles are omni directional antennas and so exhibit little gain just a little more than 2dbi generally speaking. For 2 meters the coil is 4 turns of coax at 5 inches in diameter. If you predominately used the upper side of the 2 meter band you might put 147 00 mhz. Kb9vbr 2 meter j pole antenna specifications.

Primarily a dipole the j pole antenna exhibits a mostly circular pattern in the h plane with an average free space gain near 2 2 dbi 0 1 dbd. Dual band performance in a single antenna. See more ideas about antenna ham radio antenna ham radio. Constructed out of 1 2 inch copper tubing.

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