For the ham that wants the ultimate 4:1 current balun, this new dual core design fills the void! This is a balun originally designed by Guanella and subsequently improved by Dr. Jerry Sevick (W2FMI). By utilizing Thermaleze wire inserted in teflon tubes, Dr. Sevick was able to substantially increase the breakdown voltage between both conductors and windings while improving the overall input impedance. Building the balun with two separately wound cores (one for each conductor) greatly increases the inductive reactance.
This is a current balun that will handle 5kW from 1mhz to 54mhz with separate toroids that reduce the chance of core saturation at high power. The dual cores also provide excellent choking impedance. Consequently, this balun is a good choice if you have RFI problems or RF in your shack due to imbalanced ladder line.
Please review the scans below to appreciate the excellent specs this balun offers.
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All testing done with an AIM-4170c Network Analyzer and precision 200 ohm load
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