Channel size is the size of a channel in the currently selected system. Its value is required for correct tuning to the traffic channels, and can be changed using the main control panel of the decoder. Last control channel index is the index of the channel on which the control data signal of the current system was received last time. Frequency is the frequency on which the control signal of the current system was received last time. Received Station IDs is the list of all station IDs encountered during monitoring the current system.
Control channels is the list of control channels encountered while monitoring the current system.
Generally, each control channel corresponds to a site with a complete base station. In large installations there might be two or more sites of the same system, every one with its control channels. The list of control channels may have some common values. This depends on the channel allocation strategy adopted by the system administrator. All this information is useful when the system is surveyed for correct usage of the allocated frequencies.