True, but older houses are also less likely to have 220V runs in the first place, I think. That might be a Baltimore thing, though - not sure I've ever seen one in residential here, but this is also the city where municipal gas service was born, so it isn't a surprise for gas-fired ranges and dryers needing only 110V service to be ubiquitous here.
I don't know if I'd want to depend on incidental capacitive coupling to carry signal between phases. I guess if it works it's likely to go on doing, but I feel like there's got to be some pretty sharp bandwidth constraints for noise, especially in residential...
I don't know if I'd want to depend on incidental capacitive coupling to carry signal between phases. I guess if it works it's likely to go on doing, but I feel like there's got to be some pretty sharp bandwidth constraints for noise, especially in residential...