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4 VHF 300 Series Owner’s Manual
Basic Operation
Basic Operation
Turning the Radio On and Off
IMPORTANT: To use the DSC capabilities of your radio, you must rst enter an MMSI
number. See page 14 for more information.
To turn on the radio, press and hold the 16/9 key (North American models) or 16+ key
(International models). If you have not entered a Mobile Maritime Safety Identity (MMSI)
number, you must press the CLEAR key to access the Home screen. To turn off the radio,
press and hold the 16/9 key or the 16+ key.
TIP: For information on enabling auto power-on, see page 31.
Adjusting the Volume
TIP: To set the appropriate volume level, rst turn the squelch level to off, and then adjust
the volume. See below for more information on adjusting the squelch level.
1. Press the VOL/SQL key until the screen displays “CURRENT VOLUME.”
2. Turn the Channel knob on the handset to adjust the level.
Adjusting the Squelch
1. Press the VOL/SQL key until the screen displays “CURRENT SQUELCH.”
2. When receiving, rotate the Volume knob counterclockwise until you hear audio.
3. Rotate the Volume knob clockwise until there is no background noise.
Selecting Channels
Turn the Channel knob clockwise or counterclockwise to change channels. See page 36 for
lists of International, Canadian, and USA channels.
Transmitting with the Radio
1. Select the appropriate channel.
2. Check to ensure that the channel is clear before transmitting. The Federal
Communications Commission (FCC) and international regulations require that you not
obstruct the communications of others.
3. Press the PTT key on the handset to transmit on the current channel. The
TX
icon is
displayed at the top of the screen.
4. Speak your message and release the PTT key.
NOTE: Five minutes is the maximum amount of time for transmission. After you have
pressed PTT key for ve minutes, PTT is disabled until you release the PTT key.