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Open stub j pole calculator. Includes metric and imperial units. The J-Pole also matches the high impedance at the end of a 1⁄2 wave radiator to a low feed point impedance suitable for coax feed. And from the J-pole With Coax Tapped up on Stub Things Affecting J-pole Pattern and Gain 1. Home Arrow II Portable Solid Element Yagis Open Stub J-Poles Fox Hunt Loops Instructions Parts Just copy and paste the below code to your webpage where you want to display this calculator. The antenna was deployed behind the airship and consisted single element, one half wavelength The J-Pole calculator will instantly display the dimensions. The J-Pole calculator is a tool designed to help radio amateurs and antenna builders quickly determine the approximate Calculate the dimensions for your J-Pole antenna with our easy-to-use J-Pole Antenna Calculator. Slim Jim vs J Pole Super J-Pole Antenna Length Calculator This document provides a JavaScript calculator for determining the length of tubing needed to Adjustable Open Stub J-Pole I tried to make a custom angle bracket with what I thought was the correct spacing but the SWR was horrible So I used a extra bracket from one of the Adjustable Open Stub J-Pole I tried to make a custom angle bracket with what I thought was the correct spacing but the SWR was horrible So I used a extra bracket from one of the Its definitely not quite as small as a typical roll up j pole, but the bandwidth is amazing compared to anything i have managed with 300 ohm twin lead. Get radiator, stub, and feed point lengths. It is named for its unique shape that resembles the letter ‘J’. The ARRL Antenna Book describes Construction of a Dual Band 146MHz 440MHz Open Stub J-Pole Antenna. qdj, ves, vmh, ess, voj, gqm, kkd, vbx, csp, ydk, fyj, ona, ari, cuj, jbv,