Dan Koellen AI6XGMar 211 minToroid Transformers - How Hot Will It Get?There are a number of factors in choosing a toroid for a RF transformer. While one may model electrical performance, calculate predicted...
Dan Koellen AI6XGOct 4, 20208 minTrapped 20/30/40 Meter EFHW AntennaAn End Fed Half Wave (EFHW) antenna for operation on 20, 30 and 40 meters was built for SOTA operation. By using traps, the antenna...
Dan Koellen AI6XGJun 6, 20204 minEnd Fed Half Wave Antennas: More About the Primary CapacitorI recently posted a blog claiming that a capacitor in the primary of the matching transformer is not needed for end fed half wave (EFHW)...
Dan Koellen AI6XGMay 27, 20203 minEnd Fed Half Wave Antennas: Is a Primary Capacitor Really Needed?In my research on End Fed Half Wave (EFHW) antennas I found that nearly all have a capacitor in the primary (rig) side of the transformer....