The NEC-2 engine, used by many antenna simulation free programs, has no direct way to simulate insulated wires. This is a pity, because it is interesting to see what happens with antennae made of cables with a lower velocity factor. So, here it is a solution. The principles The solution is based on the fact […]

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Today I wanted to measure the characteristic impedance of a unknown transmission line; in this case, it was a Hi-Fi stereo line I bought from the local hardware store. Measuring the impedance with miniVNA is quite simple: as we know, when a transmission line is correctly loaded, it should return a fixed resistance value and […]

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