Motorola RADIUS GM300 User Manual

Operating Instructions for the Motorola
Radius® GM300 16-Channel, Conventional FM Radio
To turn the radio on
Turn the ON/OFF VOLUME knob clockwise until it clicks. The LED lights will show the last status
of the radio, and a start-up tone will be heard.
To receive
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.
To transmit
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-
nel.
NOTE: 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.
ON/OFF
VOLUME
CHANNEL
UP
MONITOR
LED
SCAN
LED
TRANSMIT/
BUSY LED
MONITOR
SELECT SPEAKER
SCAN
CHANNEL
DOWN
MICROPHONE
CONNECTOR
+
Pri
Usr
Scan
*6880902Z41*
6880902Z41-B

Motorola RADIUS GM300 Specifications

General

Frequency Range	VHF: 136-174 MHz, UHF: 403-470 MHz
Voltage	13.8 VDC
Modulation	FM
Channel Spacing	12.5 kHz, 20 kHz, 25 kHz
Operating Temperature	-30°C to +60°C
Channel Capacity	16 channels

Summary

Basic Radio Operations

Turning the Radio On

How to power on the Motorola GM300 radio and what to expect.

Receiving and Transmitting

Steps for receiving, monitoring, and transmitting calls using the radio.

Time-out-Timer (TOT) Function

Explanation of the TOT feature that limits transmission duration.

Channel Scan Features

Managing Scan Functionality

How to activate, deactivate, and cycle through scan types.

User Scan List Management

Creating, modifying scan lists, and setting priority channels.

Nuisance Channel Deletion

Temporarily removing unwanted channels from the scan list.