You're talking about flipping the polarity, going occasionally from conductor-positive to conductor-negative (the shield must remain at ground potential.) If I

You're talking about flipping the polarity, going occasionally from conductor-positive to conductor-negative (the shield must remain at ground potential.) If I remember correctly that actually makes things much worse if you've operated at one potential for a considerable amount of time. You could operate the cable at AC ~ 0.1Hz but your ability to actually transmit MWH would suck.