Raymarine Ray48 Owner's Handbook Manual: Controls

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3.2.1 Controls

VOLUME Control (On/Off)
1
Turns the radio On and Off and controls the Volume of the audio output to the speaker.
2 [▲] [▼] Keys
The Up and Down keys are used to move the channel numbers up or down. The channel
number can be increased or decreased by one with each key press, or will continue to
increase or decrease the number as the key is held.
SQUELCH control
3
Provides an adjustable input signal threshold to eliminate random RF background noise
during "no signal" conditions. This control sets the signal-to-noise ratio at which a signal
will become audible.
[16 PLUS] Key
4
Used to select channel 16 immediately. This channel has been preset to channel 16 at the
factory prior to shipment. Refer to section 3.3.2 for instructions on how to change the 16
PLUS channel. The 16 PLUS key on the microphone has the same functions as the 16
PLUS key on the radio.
[WX/INT] Key
5
When pressed once, puts the radio into the weather channel receiving mode. A "WX" will
be displayed on the LCD along with the weather channel number (0-9).
When pressed and held for two seconds, the radio toggles between the US and
International channel sets. "INT" appears on the display in International mode.
[MON/1/25] Key
6
When pressed once, the radio enters the MONITOR mode and "MON" is displayed on the
LCD. In this mode, the radio will scan (monitor) 16 PLUS (priority) channel,
a selected working channel, and a weather channel for the weather alert tone.
When pressed and held for two seconds, this key toggles the transmitter output power
between 1 watt ("1W" is displayed) and 25 watts ("1W" disappears).
[SCAN] Key
7
Used to enter All Scan and Memory Scan Modes.
More detailed operation information is available in Section 3.3.4 Scan Modes
PTT (Push-To-Talk) Switch
8
When pressed, puts the radio into the transmit mode and "TX" will be displayed on the
LCD.
[▲] [▼] Keys
9
The Up and Down keys are used to move the channel numbers up or down. The channel
number can be increased or decreased by one with each key press, or will continue to
increase or decrease the number as the key is held.
[16 PLUS] Key
Used to select channel 16 immediately. This channel has been preset to channel 16 at the
factory prior to shipment. Refer to section 3.3.2 for instructions on how to change the 16
PLUS channel. The 16 PLUS key on the microphone has the same functions as the 16
PLUS key on the radio.
All of the above keys except PTT will produce an audible "beep" when pressed.
9

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