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Motorola GP644

The small and smart GP644 offers all the functionality of the popular GP640 but one third smaller and lighter. Its size and weight makes it particular suitable for customer-facing environments when radio usage is required to be more discreet.

The radio helps to protect vulnerable workers with Emergency Signalling triggered by pressing the bright orange Emergency Button which sends a help signal to a pre-defined person of group of people.

The Time-out Timer allows for more efficient use of the radio channels by limiting the amount of time for which a user can transmit. Missed Call Alerts makes returning an unanswered call easy. Dynamic Regrouping allows radio talkgroups and preferences to be changed remotely, keeping radios in use in the field. The GP644 is not option board capable.

The GP644 is supported by a wide range of Motorola Original Accessories including carrycases and straps, earpieces and headsets, batteries and chargers all designed to tailor the radio to the precise requirements of the user.

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Highlights of the GP644

  • Signalling - MPT
  • Channels - 164
  • Option Board - NO
  • Keypad - NO
  • Display - NO
  • Emergency Button - Yes
  • Battery Life - Up to 13 Hours1
  • MilSpec - 810 C,D,E
  • Intrinsically Safe - Yes (FM)2

The fully compliant MPT signalling package includes MPT1343, Regionet 43 and ANN modes of operation. Radios are configurable for up to 2 personalities including Talkgroup Select and Conventional signalling.

X-Pand™ Voice Compression and Low Level Expansion
Crisp, clear and strong audio quality in virtually any noisy environment. Low level expansion allows further improvements in audio quality by reducing noise usually heard during pauses in conversation.
Dynamic Regrouping
Provides over-the-air reconfiguration of group identity.
Missed Call Alerts
The radio can store an incoming caller identity and prompt the user to return the call they receive.
Wideband and Programmable Channel Spacing
Provides flexibility in deployment and stocking.
Time-out Timer
Limits the amount of time a user has to continuously transmit on a channel. This allows for more efficient use of the channel.


General Specification
Channels 16 (Conventional Mode)
Power Supply Rechargeable battery 7.5v
Dimensions: H x W x D (mm) Height excludes knobs
With standard Lilon battery 101.5 x 55.5 x 30.5
With high capacity Lilon battery 101.5 x 55.5 x 35.5
Weight: (gm)
With standard Lilon battery 250
With high capacity Lilon battery 270
Average Battery Life: @ 5/5/90 Cycle
Power Setting Low High
With standard Lilon battery 9 hours 7 hours
With high capacity Lilon battery 13 hours 10 hours
Sealing: Withstands rain testing per MIL STD 810 C/D/E and IP54
Shock and Vibration: Protection provided via impact resistant housing exceeding MIL STD 810-C/D/E and TIA/EIA 603
Dust and Humidity: Protection provided via environment resistant housing exceeding MIL STD 810 C/D/E and TIA/EIA 603
Frequencies — Full Bandsplit3 UHF 403-470 MHz
Channel Spacing 12.5/20/25 kHz
Frequency Stability
(25°C to +55°C, +25°C Ref)
±2.5 ppm
Power 1–4 W
FM Hum and Noise +40 dB typical
Conducted/Radiated Emission – 36 dBm<1 GHz
– 30 dBm >1 GHz
Audio Response (300–3000Hz) +1 to –3 dB
Audio Distortion <5% typical
Portable Military Standards 810 C,D,E
Applicable MIL-STD 810C 810D 810E
M = Methods, P = Proceedures
Low Pressure 500.1 1 500.2 2 500.3 2
High Temp. 501.1 1,2 501.2 1,2 501.3 1,2
Low Temp. 502.1 2 502.2 1,2 502.3 1,2
Temp. Shock 503.1 1 503.2 1 503.3 1
Solar Radiation 505.1 1 505.2 1 505.3 1
Rain 506.1 2 506.2 2 506.3 1,2
Humidity 507.1 2 507.2 2,3 507.3 2,3
Salt Fog 509.1 1 509.2 1 509.3 1
Dust 510.1 1 510.2 1 510.3 1
Vibration 514.2 8,10 514.3 1 514.4 1
Shock 516.2 1,2,5 516.3 1.4 516.4 1,4
  • Based on 5:5:90 duty cycle.
  • When purchased and used in conjunction with the appropriate, approved accessories. For definitive listings please refer to the appropriate Intrinsic Safety supplement. NOT available for use in EU / EFTA countries
  • Availability subject to individual country’s law and regulations.
  • 16 Channels in conventional mode or 16 Talkgroups.
  • Data for +25°C unless otherwise specified.
  • Specifications are subject to change without prior notice and are issued for guidance purposes only.
  • Radios meet all applicable regulatory requirements
  • Conforms to RTTE Directives: 1999/5/EC.
  • Relevant Standards: EN300 086–2, EN300 113–2, EN301 489–05.

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