Apparatus for diversity coupling power line signals into a three-conductor power supply network

Apparatus for coupling a modem to a power supply network for transferring data via the power supply network, comprising:

• a power connector which is configured to connect the apparatus to a phase conductor, a neutral conductor and a protective earth conductor of the power supply network,
• a transformer, comprising a secondary winding, a first primary winding and a second primary winding connected in series to the first primary winding,
• a first primary contact which is arranged on the end of the first primary winding facing away from the second primary winding,
• a second primary contact which is arranged on the end of the second primary winding facing away from the first primary winding,
• a third primary contact which is arranged between the first primary winding and the second primary winding,
• a first and a second secondary contact which are respectively arranged on the different ends of the secondary winding,
• wherein the first primary contact, the second primary contact and the third primary contact are in each case configured to be connected via the power connector to a different conductor in each case, chosen from a phase conductor, a neutral conductor and a protective earth conductor of the power supply network, and
• wherein the apparatus is configured to couple at least in terms of high frequency a secondary transmission channel, which is formed between the first and second secondary contacts, to two primary transmission channels, and
• wherein the apparatus is configured to form a first transmission channel of the two primary transmission channels between the first and the third primary contacts and a second transmission channel of the two primary transmission channels between the second and the third primary contacts,
• wherein the winding ratio between the first primary winding and the second primary winding is approximately 1:1, and the winding ratio between the first primary winding and the secondary winding is approximately 1:2, and the winding ratio between the second primary winding and the secondary winding is approximately 1:2.