This module is fully compliant with the CCITT recommendations for VHF SELCAL. Three decode windows are provided.

The first decode window is an accurate analysis of the parameters of the Selcal signal sequence. The Date/Time stamp is followed by the actual tone channel number received, its nominal measured frequency, its frequency error, its duration in milliseconds and its measured signal to noise ratio. Finally the decoded tone sequence is displayed.

The second small window merely displays the decoded tone sequence, system name (in this case CCITT), and the date/time stamp.

The third window contains merely the decoded tone sequence.

Click here for a typical CCITT sound