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The Friday Night Roundtable Discussion Net - J Pole Calculator








All dimensions measured from the ends and the inner edges of the pipes.

Use 1/2" copper pipe, fittings and end caps.

Solder all connections after final tuning.

The distance from bottom section of pipe to the "T" fitting is inconsequential.

Connect the center conductor of the coax at the Green Arrow.

Connect outer conductor of coax (shield) at the Blue Arrow.




Enter desired frequency : (MHz)