Motorola GM300 User Manual
Operating Instructions for the Motorola
Radius® GM300 8-Channel, Conventional FM Radio
To turn the radio on
Turn the ON/OFF VOLUME knob to the right until it clicks. The LED lights will show the last sta-
tus of the radio, and a start-up tone will be heard.
Set the volume by turning the ON/OFF VOLUME knob clockwise.
Select the channel by pressing the UP/DOWN (
) button. An extended press will scroll
through the channels.
To monitor a channel, push the MONITOR (
) button or take the microphone off hook. When
in the monitor mode, the amber MONITOR LED will light steadily.
To unsquelch the radio, press and hold the MONITOR (
) button for two seconds.
To leave the unsquelched mode, press the MONITOR (
) button again. This will return the
radio to the coded squelch (PL/DPL) mode.
A short beep tone will be heard whenever a keypress is made.
When the channel is clear, press and hold down the Push-to-Talk (PTT) button on the side of the
microphone, and speak slowly and clearly. The TRANSMIT/BUSY LED will remain red until the
PTT button is released to indicate that you are “on the air”.
The red TRANSMIT/BUSY LED will flash whenever there is another carrier on the selected chan-
If your radio has the Time-out-timer (TOT) function activated, transmission will termi-
nate if you hold the PTT button down for over 60 seconds or the programmed time
period. When this occurs, an alert tone sounds four seconds before the transmission is
cut. To resume transmitting, release the PTT and push again.