Supplied with:

  • GX300 radio
  • Mounting bracket
  • Gimbal knobs
  • DC power lead
  • Fuse
  • Microphone
  • Microphone clip
  • Screw pack
  • Instruction manual

GX300 27 MHz CB/Marine Radio

The GX300 is an innovative new design incorporating both 27 MHz Citizen Band and 27 MHz Marine Band transceivers into one unit. Channel recall, dual watch, large back-lit display, very effective noise limiter and enviroment protected design (IP55) the GX300 covers virtually all aspects of 27 MHz communication on land or sea in one unit. The front mounted speaker provides loud clear reception and the channel controls on the microphone make operation easy.

The GX300 is supplied with a gimbal mounting bracket, but with a depth of just 70 mm, the GX300 is also perfectly suited to flush mounting (using the optional flush mount kit).

Available in either black or white, the GX300 allows the user to easily switch between CB and marine mode. The compact design is approximately one third the depth of all other 27 MHz radios, allowing for shallow flush mounting installations.



  • Large back-lit LCD display with lamp dimming function
  • Dual watch feature
  • Rotary squelch control
  • Ingress protection to IP55
  • Programmable memory channel scan
  • Remote channel change function microphone
  • Advanced noise limiter (NL) circuitry
  • Multiple mounting options (flush or gimbal mount)
  • User selection of Australian 27 MHz CB or 27 MHz marine channels (26 MHz version available in New Zealand)
  • Front mounted speaker
  • Priority channel selector key
  • Available in black or white


Compliance AS4367 and AS/NZS4355 (Australia only)
Frequency Range 26.965 - 27.980 MHz
Channel Set Australian 27 kHz Marine
Australian 27 MHz Citizens Band
Modulation AM (A3E)
Supply Voltage 12.6 V DC nominal
10.8 - 15.2 V DC range
Frequency Error <50 ppm over temperature range
Dual Watch Monitor time - 250 ms
Monitor period - 2 seconds
Scan Rate 5 channels/sec
Modulation Frequency Response 300 Hz to 3 kHz; +1 - 3 dB
Max Modulation Depth 100%
Carrier Power Output 4 watts max.
Microphone Level @ 1 kHz for 60 % Modulation 1 Pa
Spurious Emissions <-26 dBm
Demodulated Frequency Response 300 Hz to 3 kHz; +1 - 3 dB
Receive Sensitivity -110 dBm for 12 dB SINAD @ 30% modulation
Max. Squelch <-80 dBm
Adjacent Channel Sensitivity ≥55 dB
Spurious Response Immunity ≥55 dB
Conducted Spurious Radiation -57 dBm
Audio Output Power 8 Ohms 2.5 Watts
Dimensions 164 (W) x 65 (H) x 58 (D) mm
Flush Mount Depth 26 mm
Weight 450 g
Temperature Range -10˚C to +60˚C
Ingress Protection Rating IP55
The GX300 will operate over the 26 - 30 MHz frequency range. For more information specific to frequencies outside of the Australian Marine or CB Bands please refer to the appropriate amendment or contact GME at
*All specifications are typical and are subject to change without notice or obligation