FRS and compatible units is possible on these seven channels. Before trans- mitting on the selected channel, press the Monitor Button (2) 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 basic channel,

-In the standby mode, press the Up Button (10) briefly to move to the next higher main channel number.

-Press the Down Button (11) briefly to move to the next lower main chan- nel number.

CTCSS Mode (Sub Channel Selection)

Coded Tone Controlled Squelch System (CTCSS) with 38 Sub-Frequencies. This feature allows you to utilize the coded squelch tones (00 ~ 38) within a main channel. This enables you to communicate with another party on the same main channel using the same sub-code. This filters out unwanted transmissions (transmissions without the same coded squelch tone). There are 38 CTCSS Sub-channels for each main channel. A different subcode may be selected for each of the 15 channels.

To change the CTCSS Sub-channel,

-Press the Mode Button until the sub channel number or frequency is displayed. Once a value is entered the Icon (CTC) appears and flashes in the LCD panel.

-Press the Up Button or Down Button to choose the desired sub-channel to use.

-Press the PTT Button to confirm your selection.

NOTE: To communicate with other GMRS units, they must be switched to the same channel and CTCSS sub code. To communicate with other GMRS units that do not have sub codes, switch your unit to the same channel with the sub code set to 00 or 000.0 depending on the CTCSS mode display.

The CTCSS subcodes do not prevent others from hearing your

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Audiovox 1525 owner manual Ctcss Mode Sub Channel Selection