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Icom M304

Return to M304

Discontinued VHF Marine Radios  



M304 Specifications

Frequency Range
Transmit: 156.025-157.425 MHz
Receive: 156.050-163.275 MHz
Usable channels USA, CAN, INT, WX channels
Type of emission 16K0G3E, 16K0G2B
Power supply 13.8V DC ±15%
Current drain
(at 13.8V DC)
Tx  5.5 A (at 25W output)
Rx 1.5 A (at AF max.)
Operating temperature range -20°C to +60°C; -4°F to +140°F
Antenna impedance 50Ω (SO-239)
Dimensions (WxHxD, projections not included) 153x67x133mm, 61/32x25/8 x 51/4 inches
Weight (approx.) 825g; 1.8lb
NMEA formats Version 2.0 or 3.01, RMC; GGA, GNS, GLL


Output power 25 W or 1 W (at 13V DC)
Modulation system Variable reactance frequency modulation
Max. freq. deviation ±5 kHz
Frequency error ±10 ppm
Spurious emissions Less than -70 dBc (at 25W)
Adj. channel power More than 70 dB
Audio harmonic distortion Less than 10% (at 60% dev)
Residual modulation More than 40 dB


Intermediate freq. 1st 21.7 MHz, 2nd 450 kHz
Sensitivity 0.22μV typical at 12dB SINAD
Squelch sensitivity Less than 0.22μV
Adj. Ch. selectivity More than 70dB
Spurious response More than 70dB
Intermodulation More than 70dB
Hum and noise More than 40dB
Audio output power 4.5 W typical at 10% distortion with a 4Ω load


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