Audiovox GMRS602 Owner's Manual page 11

General mobile radio service
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Monitor/Display Backlight Button (2)
This button is used to to check activity on the current frequency before
transmitting. Check activity by pressing the Monitor (M) Button longer
than 2 seconds; the
icon will apppear on the display and you will hear
static if frequency is clear. Do not transmit if you hear conversation.
Hold down the Monitor Button again longer than 2 seconds and the
icon will disapppear from the display.
The monitor function will temporarily bypass the squelch setting and play
all signals on a given channel. This feature is useful when communicating
with other parties at extreme range.
By pressing the monitor button momentarily, the LCD backlight is turned
on; the LCD backlight will turn off automatically in about 5 seconds, unless
the monitor button is pressed momentarily once again.
Push To Talk (PTT) Button (4)
Pressing and holding this button will allow you to speak to any transceiver
that is set to the same channel and privacy code setting as yours. Hold the
transceiver approximately 1 to 2 inches from your face as you speak into
the built in microphone (9). After you have finished speaking, release the
PTT Button to allow reception of incoming signals. It is not possible to
transmit and receive at the same time. Whenever the button is pressed,
the transmit signal icon (
) will appear in the upper left corner of the
display. Releasing the button allows the unit to revert to standby mode.
When receiving an incoming signal, the
icon will appear.
The PTT Button can also be used as a two-way call ringer. Pressing the
button twice quickly will call another party on the same channel. The transmit
icon (
) will be displayed for 3 seconds and then disappear.
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