Kenwood TS-990S Operation Manual - Page 116

5 ASSISTING YOUR SMOOTH QSO CTCSS OPERATION (FM MODE) The CTCSS stands for Continuous Tone Coded Squelch System. Add your audio signal with the CTCSS tone frequency predetermined with the station with which you wish to have a QSO. When the CTCSS tone frequency in the receive signal from the other station coincides with the CTCSS tone frequency of your station, the squelch opens and you can hear the audio received. You can select a desired CTCSS tone frequency and the tone frequency independently, but cannot use the CTCSS and tone simultaneously. CTCSS Tone Frequency: The squelch opens when the transceiver receives the CTCSS tone to which the same CTCSS tone frequency as that is configured for the transceiver is superimposed A CTCSS tone frequency scan makes it possible to detect the CTCSS tone frequency contained in the receive signal. If the transceiver receives the signal while the CTCSS tone frequency scan is in operation, you will hear the audio of the receive signal regardless of whether the CTCSS tone frequency coincides or not. Cross tone: The squelch opens when the CTCSS tone frequency matches during the reception and the tone is transmitted at the configured tone frequency at the time of signal transmission. Different tone can be used for transmission and reception. Note: ◆◆The squelch opens and you can hear the audio received only if the CTCSS tone frequency in the receive signal coincides with the CTCSS tone frequency configured in the transceiver. Use this function to single out the receive signal from the other station so that unnecessary signals will not be received. Therefore, the use of the CTCSS frequency does not prevent the contents of your call from being monitored by other stations. ◆◆You do not need to configure the tone frequency if you store the configuration for CTCSS tone frequency in a memory channel and retrieve the frequency and operating information from the memory channel. For memory channel configuration, refer to "MEMORY CHANNEL". {page 10-1} If you use this transceiver as the amateur radio base station of the VoIP, you can configure the received audio to sound from the speaker even if the CTCSS tone frequency does not match. {page 16-23} ◆◆To use a CTCSS tone, the RX Monitor must be assigned to a PF key allowing you to monitor the status of the transmit frequency. {page 16-6} CONFIGURING THE CTCSS TONE FREQUENCY You can configure the desired CTCSS tone frequency. 1 Press and hold [TONE] (F4) to open the FM Tone Frequency screen. 2 Press [M/S] (F6) to select either main band or sub band. Parameter box for frequency (FREQ. [Hz] allows you to edit. 3 Press [ "CTCSS". ] (F2) or [ ] (F3) to select 4 Press [-] (F4) or [+] (F5), or rotate the MULTI/CH control to select the CTCSS tone frequency. 5 Press [ESC] to exit. Note: ◆◆If you press and hold [(RESET)] (F1), the selected CTCSS tone frequency reverts to the default (88.5 Hz). CTCSS Tone Frequency (Hz) 67.0 88.5 114.8 151.4 177.3 203.5 250.3 69.3 91.5 118.8 156.7 179.9 206.5 254.1 71.9 94.8 123.0 159.8 183.5 210.7 74.4 97.4 127.3 162.2 186.2 218.1 77.0 100.0 131.8 165.5 189.9 225.7 79.7 103.5 136.5 167.9 192.8 229.1 82.5 107.2 141.3 171.3 196.6 233.6 85.4 110.9 146.2 173.8 199.5 241.8 5-36 Index Contents