Control apparatus for changing a downtilt angle for antennas, in particular for a mobile radio antenna for a base station, as well as an associated mobile radio antenna and a method for changing the downtilt angle

1. A method for controlling a depression angle of a radio antenna including:

self-calibrating the antenna with respect to the adjustment range of the downtilt angle by interpolating between plural limit positions using a plural point calibration process,

the self-calibrating being performed based on the plural-point calibration process by (a) first moving a driveable operating device to a first extreme or limit position, (b) sensing said driveable operating device has reached said first extreme or limit position, (c) then moving said driveable operating device from the first extreme or limit position to a second extreme or limit position different from said first extreme or limit position while measuring adjustment movement between the first extreme or limit position and the second extreme or limit position, and (d) sensing said drivable operating device has reached said second extreme or limit position;

associating reaching of the first extreme or limit position with a first specific value of a maximum or minimum depression angle,

associating reaching of the second extreme or limit position with a second specific value of a maximum or minimum depression angle,

based at least in part on said measured adjustment movement, using the sensed first extreme or limit position and the sensed second extreme or limit position to interpolate depression angles between said first depression angle value and said second depression angle value, said interpolated depression angles corresponding to intermediate relative positions between the first extreme or limit position and the second extreme or limit position; and

using said interpolated depression angles at least in part to drive said driveable operating device to a desired position, intermediate between said first extreme or limit position and said second extreme or limit position, corresponding to a desired depression angle.

2. The method as claimed in claim 1 , further including storing the respective setting value of the driveable operating device and a corresponding predetermined depression angle of the mobile radio antenna in a non-volatile memory.

3. The method of claim 1 further including presetting a changed depression angle and determining a corresponding, relative drive value to carry out an adjustment directly to the new nominal position from a current position of the driveable operating device.

4. The method as claimed in claim 3 , further including driving a number of mobile radio antennas equipped with separate control apparatuses, by means of a common command appliance using addressing.

5. The method as claimed in claim 1 , further including adjusting the movement-dependent driveable operating device using a rotation speed measurement.

6. The method as claimed in claim 1 , further including using a common appliance to set and/or monitor functions of plural mobile radio antennas.

7. The method of claim 1 wherein said measuring is performed by counting rotation pulses.

8. A method for controlling the downtilt angle of an antenna, comprising:

moving a moveable element through a range of motion beginning at a first limit position and ending at a second limit position different from said first limit position,

as said moveable element moves through said range of motion between said first and second limit positions, counting pulses to measure the position of said moveable element relative to said first and second limit positions, thereby self-calibrating the antenna using a plural point calibration with respect to downtilt angle adjustment range,

in response to said counted pulses and said self-calibration, interpolating downtilt angle positions intermediate of said first and second limit positions by performing an interpolation calculation based on said first and second limit positions and the number of said counted pulses, to determine the incremental downtilt angle adjustment represented by each of said counted pulses;

determining, based on said determined incremental downtilt angle adjustment, the number of pulses to count from at least one of said first and second limit positions to provide an intermediate relative position of said moveable element between the first and second limit positions corresponding to a desired antenna downtilt angle, and

controlling said moveable element while counting said pulses to move to said intermediate relative position; and operating said antenna said desired antenna downtilt angle.