The HF Classifier Code Check is a versatile analysis tool for the classification of unknown signals and the determination of the protocol (mode) in use. The CCC combines a classifier with a table-based mode check and an advanced code check. The CCC will attempt to process all signals within a bandwidth of up to 4.8 kHz depending on settings. As is obvious from its name, the HF Classifier Code Check primarily addresses the requirements for the analysis of signals below 30 MHz, but it will of course work with signals in other frequency ranges if they fall within the bandwidth, and fulfil the other criteria, used by the CCC processes.