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Bruce W. Ellis wrote:
The various automatic antenna tuner/matcher manufacturers list a tuning range in Ohms - e.g., 6 - 1000 Ohms. The question I have is to whether that value is the magnitude of the impedance (which correlates to SWR) or the real part of the impedance (since the tuner should be able to cancel out the reactive part of the impedance). W0BF neither, really. What it probably means is that, theoretically it can transform a resistive load of 6-1000 ohms to 50 ohms. You actually have to look at the available L and C and decide if it can tune a particular reactive load at a particular frequency. The step size for L and C will also determine how good the final match is. You can write a little program (or spend some serious time with a smith chart) to iterate through the various possibilities, essentially working backwards from a 50 ohm load impedance to see the possible input Zs it can match. |
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