First of all: I am not talking about traditional powerline communication (ethernet protocol etc) but about a very simple and primitive communication, like serial data transmission (https://en.wikipedia.org/wiki/Serial_communication)
I have the idea to use a simple high pass filter to "filter out" the AC voltage and just have the raw serial signal left. This idea sounds so simple to me that I can't immagine why such devices don't exist. At least I didn't find anything.
Here some more information about my idea:
On the left side you can see the transmitter which "connects" to the power line using a high pass filter. I did some calculations with those values and the mains AC signal should be filtered out very good. (Should be only around 100mV left so this should not fry the electronics).
On the right side there is the same setup with the same highpass filter.
I assume the communication to be a serial communication with a baud rate (frequency) of 115,200 Hz.
So with the circuit above, the AC power signal (50Hz) should be filtered out and the data signal (115 kHz) should be able to pass through. This sounds a bit too easy and to simple to me so I am sure I am missing something here. Please let me know what? Or am I missing nothing - should this work??