Communication solution for antennas

1. A control system for controlling radiation direction of an antenna beam of an antenna, the radiation direction being adjustable by an actuating device influencing phase shifting means based on an actuating signal, the system comprising:

filtering means connected, in use, to a feeder cable arranged for carrying RF signals and a control signal, said filtering means being arranged for filtering out said control signal, and

an external control unit, attached to said antenna, including detecting means and control means, said detecting means being arranged for detecting said filtered out control signal, said control means being arranged for producing the actuating signal based on the detected control signal,

wherein said filtering means is directly connected to said external control unit so as to provide the filtered out control signal directly to said external control unit.

2. The control system defined in claim 1 , wherein the detected control signal is in a signal format suitable for input in a logical circuit.

3. The control system defined in claim 1 , wherein said control means is a processor.

4. The control system defined in claim 1 , wherein converting means is arranged for supplying control signals to the feeder cable.

5. The control system defined in claim 4 , wherein said converting means is arranged for modulating control signals and supplying the modulated control signals to the feeder cable.

6. The control system defined in claim 5 , wherein the control signals are modulated using OOK (On Off Keying).

7. The control system defined in claim 5 , wherein the control signals are modulated using FSK (Frequency Shift Keying).

8. The control system defined in claim 4 , wherein said converting means is arranged for superposing control signals on the RF signal on the feeder cable.

9. The control system defined in claim 1 , wherein said filtering means includes a capacitor and an inductance.

10. The control system defined in claim 1 , wherein said detecting means includes a diode and a capacitor.

11. The control system defined in claim 1 , wherein said filtering means is located inside a TMA (Tower Mounted Amplifier).

12. The control system defined in claims 1 , wherein the external control unit is a RET (Remote-Controlled Electrical Down-Tilt) unit.

13. The control system defined in claim 1 , wherein second control means is arranged for providing control signals to said converting means.

14. The control system defined in claim 13 , wherein the control signals being provided to said converting means are in signal format RS485.

15. The control system defined in claim 13 , wherein the control signals being provided to said converting means are OOK modulated.

16. A base station including a control system as defined in claim 1 .

17. Method for controlling radiation direction of an antenna beam of an antenna, the radiation direction being adjustable by an actuating device influencing phase shifting means based on an actuating signal, the method including the steps of:

filtering out a control signal in filtering means being connected, in use, to a feeder cable arranged for carrying RF signals and control signals,

detecting said filtered out control signal in detecting means located in an external control unit attached to said antenna, and

producing the actuating signal in control means, also located in said external control unit, based on the detected control signal,

wherein said filtering means provides the filtered out control signal directly to said external control unit.