a radio frequency filter includes an input port configured to receive a signal , an output port configured to output a signal , and a tuning probe configured to be movable within a tuning probe port to adjust filter characteristics . the tuning probe port is configured to receive the tuning probe therein , and a locking mechanism is configured to lock the tuning probe in the tuning probe port at a desired depth and further configured to prevent movement of the tuning probe in the tuning probe port when the locking mechanism is in a locked configuration .