The GMRS-1545 has 15 channels (frequencies) (1-15) indicated by the large digits on the LCD display panel. Channels 1 through 7 are the same frequency as FRS channels 1 through 7. Communication with Audiovox FRS and compatible units is possible on these seven channels. Before transmit- ting on the selected channel, press the Monitor (M) Button (6) to check the activity on that channel. If there is activity on the selected channel, change to another channel that is clear.
To change the channel:
-From GMRS standby mode, press the MODE button (11) once; the channel number flashes.
-Press the Up button (9) briefly to move to the next higher main channel number.
-Press the Down button (13) briefly to move to the next lower main channel number.
CTCSS Mode (Sub-Channel) Selection
This unit provides a Coded Tone Controlled Squelch System (CTCSS) with 38 Sub-Frequencies for each main channel. This feature allows you to utilize the coded squelch tones (01–38) within a main channel. This enables you to communicate with another party on the same main channel using the same subcode. (This filters out unwanted transmissions without the same coded squelch tone). A different subcode may be selected for each of the 15 channels.
To change the CTCSS Sub-channel:
-From GMRS standby mode, press the Mode Button twice; a flashing 00 or sub-channel number is displayed. If 00 is displayed, press the Up or Down button to enable the CTCSS mode; the CTC icon will appear steady on the display with the flashing sub-channel number.
-Then press the Up or Down button to select the desired sub-channel for use.
-The selected sub-channel will continue flashing for about 5 seconds and then remain steady on the display.
The CTCSS mode can be turned off by selecting 00 as the setting.
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