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Primary use is with an antenna tuner and a shortened multiband dipole fed with ladder line. Design parameters behind this balun are: T match antenna tuners perform quite poorly if the resistive component of load impedance is very low, even worse if there is also a high capacitive reactive component. This is a common load found in shortened dipoles fed with open wire line. The traditional approach is to use a 4:1 balun on such antennas, but antenna tuner loss is worse with low resistive loads. The need to tolerate high voltages occurs when the balun happens to be located near a differential voltage maximum. High common mode impedance for effective reduction of common mode current. This balun is intended for use with an antenna tuner which will manage SWR and transformation mismatches. Differential insertion loss is not a significant parameter in this application, the dissipation in a current balun is primarily from the common mode current which is installation dependent and not easily predicted.
This is a current balun and has the widest operating frequency range, lowest core stress and provides the best overall balance of any balun for given cost, size, and weight. This balun is the best type to balance currents on each side of a dipole and provides the perfect transition from a balanced antenna or balanced feedline to unbalanced coax fed antenna tuners.
Specifications:
This balun will handle continuous power of 5kw or 10kw intermittent and tolerate high SWR for extended periods. It will not heat up at rated power, extended duty cycles or stressing load conditions.
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