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by Eelongate
1661 days ago
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Couldn't you send an amplitude modulated signal down a DC line by modulating the voltage but keeping that voltage always above zero? If the current never actually reverses, it wouldn't be AC as I understand it. It would be PDC, pulsed direct current. |
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In signal transmission theory people almost always think in terms of frequency ranges.
Any DC component is simply a frequency set to 0 - that can be ignored.
Similar to the earth magnetic field when talking about radio transmission in air.