Remotely controllable actuators are provided to alter the cavity size of
bandpass cavity filters to alter the bandpass characteristics. In one embodiment,
a stepper motor is used to provide lateral movement of a tuning plate to alter
the size of the cavity. The neck of the cavity is also changed in length through
the use of a tuning motor. A feedback loop is used to provide fine tuning of the
length of the neck in response to changes due to temperature and vibration to offer
maximum propagation of the signal to be transmitted. A coupling tuner is used to
adjust to the resulting change in Q to the cavity. A tuning processor is used to
receive signals from a remote location identifying the desired characteristics
of the filter.
