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0 pointsEelongate4y ago0 comments

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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goodpoint4y ago

> modulating the voltage but keeping that voltage always above zero

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.

EelongateOP4y ago

Sure, but it's still not AC. It's VDC or PDC, not AC. It's not AC if the Current isn't Alternating.

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