![]() “To achieve this result the transmission line at the point where it is connected to the impedance matching section must look into an impedance which is equal to the surge impedance of the transmission line.” “An impedance matching section of this type is particularly well suited for connecting the transmission line to the antenna since it has a very low impedance at its closed end and a relatively high impedance at its open end.” While referring to the element of the stub Leeds writes… ![]() This description aptly describes the traditional J-pole antenna quite well.Ī 1936 patent by Laurance McConnell Leeds shows an unbalanced feeding method of the J-pole antenna and describes the matching stub as prior art. All J-poles have an integrated matching stub. “The name ‘Slim Jim’ stems from its slender construction (it is only 60 inches long for 2 metre operation) and the use of a J type Integrated Matching stub (JIM) that facilitates feeding the aerial at the base, thus overcoming any problem of interaction between feed and aerial.” Īll J-poles are slim. …but first… “Slim Jim” – What does the name mean? Measurements, simulations, a college paper and Fred Judd’s own article suggest otherwise. ![]() Does the 2BCX Slim Jim antenna live up to the oft touted more gain or better takeoff angle over a traditional j-pole? Answer ![]()
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