COBHAM SAILOR SP3550 Portable UHF, User Manual, Page: 17 / 56

Operation
9
Activating a call
To activate a call to the selected channel, press and
hold the PTT button on the side of the radio.
The radio transmits as long as the PTT button is
pressed. A small
TX
sign next to the channel num-
ber indicates when the radio is in transmit mode.
Adjusting the volume
• To increase the volume, turn the on/off knob at the top of the radio
clockwise .
• To decrease the volume, turn the knob counter-clockwise .
The display shows the level of the volume, e.g. “
VOL 5
”, while it is
adjusted.
Using Squelch control
• To activate Squelch control, press the SQ key.
• To set the Squelch level, press

(closing) or

(opening). The
display shows the Squelch level while it is adjusted, e.g. “
SQ 5
”.
Adjusting the display backlight
• To turn on the backlight, press the
Light/Lock button on the side of the radio.
• To adjust the backlight level, press

or

within 3 seconds after turning on the light.
The display shows the level while it is
adjusted, e.g. “
DIM MED
”.
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