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Motorola GP388

The small and smart GP388 offers all the functionality of the popular GP380 but one third smaller and lighter. Its size and weight makes it particular suitable for more demanding users in customer-facing environments when radio usage is required to be more discreet.

In addition to the features of the GP344, the GP388 has a full keypad and an alpha-numeric display including battery gauge and caller identity. The simple intuitive menu and contact list makes one-to-one or one-to-many calls easy, putting the power of the GP388 at the user’s fingertips. And for occasions when voice communication is inappropriate, pre-defined text messages can be sent between users. The GP388 is not option board capable.

The GP388 is essential for growing organisations because of its unique versatility. When necessary, the radio can easily be programmed in the field to add or delete features. So, whether it’s the harsh environment of a construction site or the elegance of an exclusive hotel, the radio of choice is the Versatile. It’s the radio that grows with you.

The GP388 is supported by a number of Motorola Original Accessories including carrycases and straps, earpieces and headsets, batteries and chargers all designed to tailor the radio to the requirements of the user.

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Highlights of the GP388

  • Signalling - PL & 5–Tone
  • Channels - 255
  • Option Board - NO
  • Keypad - FULL
  • Display - Alpha-Numeric
  • Emergency Button - Yes
  • Battery Life - Up to 13 Hours1
  • MilSpec - 810 C,D,E
  • Intrinsically Safe - Yes (FM)2

The radio software encompasses Private Line™ and 5-tone selective signalling.

Channel Scan
Allows activity on different communications channels to be monitored and answered.
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.
Voice Operated Transmit (VOX)
Hands free operation when used with VOX headset accessory.
Emergency Signalling
Sends a help signal to a pre-defined person or group of people.
Lone Worker
Added security and safety for individuals who work remotely from their team. The radio enters emergency mode if the user does not respond to the warning signal.
Allows a user to speak quietly into a radio and still be heard clearly.
Call Forward
Allows calls to be forwarded to another radio user if you are unable to answer your calls personally.
User Information
A14-character alpha-numeric display contains a battery gauge and signal quality indicator and provides separate distinctive tones plus name decode for many incoming calls.
Ease of Use
Simple menus and an alpha-numeric contact list make the full power of GP388 simple and intuitive to use.
Status Calls
Pre-defined text messages which allow the user to send meaningful messages without talking.


General Specification
Channels 255
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 265
With high capacity Lilon battery 285
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 VHF: 136-174 MHz UHF: 403-470 MHz
UHF2: 450-527 MHz
Channel Spacing 12.5/20/25 kHz
Frequency Stability
(25°C to +55°C, +25°C Ref)
±2.5 ppm
Power 1–5 W 1–4 W
Modulation Limitation ±2.5 @ 12.5 kHz
±4.0 @ 20 kHz
±5.0 @ 25 kHz
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
Frequencies — Full Bandsplit3 VHF: 136–174 MHz UHF1: 403–470 MHz
UHF2: 450-527 MHz
Channel Spacing 12.5/20/25 kHz
Sensitivity (12 dB SINAD) EIA .35 µV typical
Intermodulation ETS -65 dB
Adjacent Channel Selectivity 60 dB @ 12.5 kHz
70 dB @ 20/25 kHz
Spurious Rejection 70 dB
Rated Audio 0.5 W
Audio Response (300–3000Hz) +1 to –3 dB
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.
  • Radios meet all applicable regulatory requirements.
  • Data for +25°C unless otherwise specified.
  • Specifications are subject to change without notice and are issued for guidance purposes only.
  • Conforms to RTTE Directives: 1999/5/EC.
  • Relevant Standards: EN300 086–2, EN300 113–2, EN301 489–05.

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