3English
RADIO OVERVIEW
RADIO OVERVIEW
This user guide covers the operation of the
GP644 Portable Radio.
Before using this radio, refer to the Product Safety
and RF Exposure booklet for Portable Two-way
Radios 6864117B25_ enclosed with your radio.
OPERATION AND CONTROL FUNCTIONS
Radio Controls
The numbers below refer to the illustrations on
the inside front cover.
1. Rotary Knob
Used as a multi-function scroll key and as a
channel selector in Conventional mode.
2. On-Off / Volume Knob
Used to turn the radio on or off, and to adjust
the radio’s volume.
3. Push to Talk Button (PTT)
Press and hold down this button to talk, release
it to listen.
4. Clear Button (Side Button 1)
Used to cancel a call, clear down at the end of
a call or Carrier Monitor (Conventional mode).
5. Side Button 2 (programmable)
Personality button, otherwise programmable.
6. Top Button (programmable)
Recommended as Emergency button.
7. LED Indicator
Green: Flashes to indicate NO SERVICE.
Red: On when radio is transmitting.
Red Flashing: When transmitting - battery low.
Green: On to indicate monitor mode active
(Conventional Mode).
Red Flashing: When receiving - channel busy
(Conventional Mode).
8. Microphone
9. Antenna
10. Accessory Connector
Connects headsets, remote speaker/micro-
phones and other accessories. Replace
attached dust cap when not in use.