The disclosure relates to a radio broadcasting method for a first multicarrier digital signal occupying a first frequency band adjacent to at least one second frequency band, each assigned to a second signal. The system uses more than two input signals, and preferably four input signals. The cycloconverter stage may include one cycloconverter circuit for each of multiple phases associated with a multi-phase grid. One suture can be of nonabsorbable material and can be brought through the end of the locking bead opposite the tip and pulled to tighten the suture loop.