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I N S T R U C T I O N M A N UA L
G X 7 5 0
Noise suppression
The inherent design of VHF FM radios results in a high level of resistance to ignition and
electrical interference. However in some installations it may be necessary to take additional
steps to help reduce or eliminate noise interference. During installation, try to route the DC
battery leads, the antenna lead or any accessory wires away from the engine compartment,
ignition or alternator wiring. If the noise continues, it may be necessary to fit a suppression kit.
Contact your local marine dealer for more information.
Similarly, if the interference you are experiencing is from other electronic equipment such as a
depth sounder, try to keep the depth sounder’s DC leads and transducer cable well away from
your GX750’s wiring.
SPECIFICATIONS*
ELECTRICAL
General
Complies with: AS/NZS4415.2.2003
Frequency Range: 155 – 165 MHz
Channel Spacing: 25 kHz
Modulation: FM
Channels Sets: International, USA, Canada, USA/Canada weather channels
Supply Voltage: 12 volt nominal, 10.5 – 15.6 volt max. range, negative earth
Frequency Stability: ±1.5 kHz over environment extremes
Scan Speed: 100 ms/channel (10 channels/sec)
Transmitter
Power Output: High: 25 watts max, Low: 1 watt max
Spurious Emissions: < -75 dBc
Frequency Deviation: ± 5 kHz max +20 dB limiting @ 1 kHz
Frequency Response: + 6 dB per octave, 300 Hz – 3 kHz, +1 - 3 dB
Demodulated S/N: > 50 dB weighted
Current Consumption: High power: < 4.4 amps, Low power: 1.1 A
Receiver
IF Frequencies: 1st: 21.4 MHz, 2nd: 450 kHz
Sensitivity: -120 dBm for 12 dB SINAD unweighted
Squelch Sensitivity: Adjustable, 10 preset levels
Spurious Rejection: > 70 dB
Intermodulation Rejection: > 75 dB
Adjacent Channel Rejection: > 74 dB
