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Another reflected power question
I'm a tad confused about this "reflected power" thing.
I've heard some statements that reflected power is something like shining a light at a mirror. But if the power is truly reflected, would not this be an easily quantifiable thing? Let's say a signal goes down a wire, "sees a mismatch" and is reflected from the end. IIRC, light travels around a foot in a nanosecond. So if you have an 80 meter dipole, and send out a mismatched signal, should not you get the reflection back to the source in a quantifiable time? That the signal isn't going quite that fast is only a measurement help. The reflected signal would be delayed significantly, no? I can easily visualize the idea that an antenna needs to be matched to a transmitter, either through the antenna's natural impedance, or through a network that makes it look like it is. Deviations on either side of the impedance will cause problems, just as they will with other systems that are expecting a particular load and getting something different. But the idea of signals being actually reflected seems hard to swallow. I'm a real dilettante in these matters, but why would a signal be reflected if the impedance was incorrect, and not if it was correct? Possibly I'm saying some pretty stupid things here. - Mike KB3EIA - |
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