Answer / kyle condran

Transmitters act as a current source so the voltage drop across the Tx will change anyway in order to provide the correct current out. As long as the supplied voltage is in the range of the Tx, ie enough to power the unit and drive the signal, it will not affect the signal.

Ohms law get tricky when there is a "constant" current source in the loops

what do you mean by smart instruments ? define ? give an example?

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