Provided herein are Pulse-Inversion sequences that provide for fundamental frequency suppression in nonlinear imaging applications. The wheel replacement system includes a wheel replacement mass and a driver for driving the wheel replacement mass. To terminate the ongoing broadcast service, the MS generates a location registration message with type field set to a value indicating a broadcast service termination request when termination of the broadcast service is required, and transmits it to the BS. The second side structural wall has a slot therein for accepting the non-circular bracket of the modular unit therein, with the slot having a first open end for accepting the non-circular bracket therein and a second non-circular end whereby the non-circular bracket can be rotated within the slot to assist in fixing the modular unit in position relative to the frame.