143BASIC OPERATION1234567891011121314151617181920N Call procedureWhen your system employs tone signalling (excluding CTCSS andDTCS), the tone call procedure may be necessary prior to voicetransmission. The tone signalling that is employed in the transceivermay be a selective calling system, which allows you to call onlyspecific station(s), and prevent unwanted stations from contactingyou.q Select a desired TX code channel or 2/5-tone code, according toyour System Operator’s instructions.