The present invention relates to an average current controller, an average current control method and a buck converter using the average current controller. A user subscribes to multiple PTT communication groups and designates one of the groups as the primary group. The microcontroller is configured to identify the operational information, and write log information representing the operational information to the persistent memory. The arbitrator then selects one of the radios associated with an impending collision to transmit, and suppresses or disables transmissions by non-selected radios during the same transmission time period for that frequency.