Motorola GM340 Service Information

Chapter 1
OVERVIEW
1.0 GM140/GM340/GM640 Models (GCN6112_)
The Controlhead contains the internal speaker, the on/off/volume knob, the microphone connector,
several buttons to operate the radio and several indicator Light Emitting Diodes (LED) to inform the
user about the radio status. To control the LED’s and to communicate with the host radio the control
head uses the Motorola 68HC11E9 microprocessor.
2.0 GM160/GM360/GM660 Models
(GCN6114-GM160 / GCN6120-GM360/660)
The Controlhead contains the internal speaker, the on/off/volume knob, the microphone connector,
several buttons to operate the radio, several indicator Light Emitting Diodes (LED) to inform the user
about the radio status, and a 14 character Liquid Crystal Display (LCD) for alpha - numerical
information e.g. channel number or call address name. To control the LED’s and the LCD, and to
communicate with the host radio the control head uses the Motorola 68HC11E9 microprocessor

Motorola GM340 Specifications

General

Channel Capacity	16 channels
Power Output	1-25 W (VHF), 1-25 W (UHF)
Weight	1.4 kg
Operating Temperature	-30°C to +60°C
Channel Spacing	12.5/20/25 kHz
Frequency Range	136-174 MHz (VHF), 403-470 MHz (UHF)
Modulation	16K0F3E, 11K0F3E