Kenwood TM-281 Operation Manual - Page 54
Selective Call, CTCSS AND DCS, CTCSS
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SELECTIVE CALL CTCSS AND DCS You may sometimes want to hear calls from only specific persons or groups. In this case, use Selective Call. This transceiver is equipped with CTCSS (Continuous Tone Coded Squelch System) and DCS (Digital Coded Squelch). These Selective Calls allow you to ignore (not hear) unwanted calls from other persons who are using the same frequency. The transceiver unmutes only when it receives a signal having the same CTCSS tone or DCS code. Received CTCSS freq.: 82.5 Hz 9 CTCSS freq.: 82.5 Hz Rejected Rejected CTCSS freq.: 100 Hz CTCSS OFF Note: CTCSS and DCS do not cause your conversation to be private or scrambled. It only relieves you from listening to unwanted conversations. CTCSS A CTCSS tone is a sub-audible tone and is selectable from among the 42 tone frequencies listed in the table on page 47. The list includes 37 EIA standard tones and 5 non-standard tones. To activate CTCSS, press [F], [CALL]. • As you press [F], [CALL], the selection cycles as follows: "OFF" ➞ "TONE" ➞ "CTCSS" ➞ "DCS" ➞ "OFF". • "CT" appears on the upper part of display, indicating that the CTCSS function is activated. When CTCSS is ON, you will hear calls only when the selected CTCSS tone is received. To answer the call, press and hold Mic [PTT], then speak into the microphone. Note: ◆ You cannot use the CTCSS and Tone/ DCS functions simultaneously. Switching the CTCSS function ON after having activated the Tone/ DCS functions deactivates the Tone/ DCS functions. ◆ If you select a high CTCSS frequency, receiving audio or noise that contains the same frequency portions may cause CTCSS to function incorrectly. To prevent noise from causing this problem, select an appropriate squelch level {page 14}. ◆ While transmitting the 1750 Hz tone by pressing [CALL] {page 25}, the transceiver does not transmit the CTCSS tone. 46