FILTER TUNING DEVICE AND TUNING PLATE INCLUDING A NUMBER OF SUCH DEVICES

摘要

The present invention relates to a tuning device in a radio filter equipment for mobile telephony in which one or more cavities in the equipment should be tuned to the right frequency. The invention also relates to a tuning plate including a number of such tuning devices. The tuning device (401) consists of preferably regular or square formed depressed parts (1, 6) in the tuning plate (300) of the filter equipment. The depressed part converges each to a square formed central plate (5) which is provided with an elevation or bulb (3) upwards. By turning a tuning screw on the equipment will then develop a force on the plate and the surrounding depressed parts. This implies that the tuning can be made automatically, more secure and with less risk for intermodulation. Different embodiments of the depressed parts are described.