# Using of RF transcieivers to communicate over 230VAC powerline

Initially I need to communicate between several devices placed within one appartment (or a building). All those devices will be connected to 230 VAC power line.

I'd like to skip any wireless communication as it will not guarantiee that neighbours will not interfere with each other.

And I'd like to have a cheap and small solution.

Initially I stuck with TDA5051A which is created directly for what I need. In addition its datasheet including detailed application schemes:

However the chip is moderately big (10mm long SO16 package) and a bit pricie (about \$3/piece not including price of additional needed components).

So this is why I turned to figure out how to do this with in the same way as RF-wireless communication does. But instead of the air I will use 230VAC power line as the medium:

So my questions are:

1. Is it enough to use a capacitor between the powerline and the transceiver?

2. Which wire is better to use for communication: line of neutral?

3. How can I be sure that the signal will reliably transmitted within one single powerline wire AND will not be transmitted wirelessly with any significant power to the neighbours electrically isolated powerline wires?

4. Is it possible to place any filter at the apartment (or building) inlet to restrict data transmission to/from neighbours?

5. I will be very appreciated if anyone will share ready-to-use schematic

6. Is there anything else I should think about or take into account?

• What makes you think that the neighbor's power is electrically isolated from yours? You're both probably connected to the same low-voltage distribution transformer. – brhans Mar 25 '15 at 12:45
• @brhans I can not be sure. And it will take place most of the times! This is why I asked 4'th question. – Roman Matveev Mar 25 '15 at 12:53

• Saying direct EM you mean conductive EM? – Roman Matveev Mar 25 '15 at 11:54