M604A
M604A features
- Favorite channel function
- Dual/tri-watch function for monitoring Ch.16 and/or call channel
- 7 levels adjustable backlit display and keypad
- Weather & alert channels
- AquaQuake® draining function
- Built-in ITU Class D DSC.
The Ultimate Marine Fixed Mount Radio
The M604 is the Flagship radio in Icom’s line. The loud audio, separate knobs, high grade receiver performance and a full key pad for easy, give the radio quick and reliable performance. The M604A has excellent receive specifications, which allow a weak signal a better chance of being heard when louder signals are around it.
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"our top pick - based on performance and features" - Frank Lanier, Practical Sailor. Read magazine review >
Output power: |
25W | |
Hailer: |
30W listen back hailer | |
Foghorn: |
Built-in | |
GPS: |
Optional external GPS/NAV interface | |
Waterproof rating: |
IPX7 |
Large LCD
The large full dot-matrix display is designed for optimum readability in any lighting condition. With the extra large font, the channel number is maximized on the display and upper and lower case characters can be easily read. When connecting to an external GPS receiver, the GPS information indication function shows course and speed data as well as position, date and time on the display.
Position request & report
Over and above the DSC, your own and other ships´ position data can be exchanged with the position request or position report functions. The received position information can be transferred to external GPS or navigation equipment*. In addition, the polling (request/ reply) function checks whether a specific ship is within the communications range.
*NMEA 0183 format is required.
Hailer capability
When connected to an external hailer horn, communication with other boats, deck or dock hands is easy. The built-in 30W amplifier increases your talk power making your message loud and clear. Four foghorn patterns are also available. The RX speaker function, receiver-repeater allows you to monitor the received radio audio from a hailer horn on the deck or tower. You can also make an announcement on-board from the microphone.
General
| Frequency range | Tx | 156.025–157.425 MHz |
|---|---|---|
| Rx | 156.050–163.275 MHz | |
| Rx (CH70) | 156.525 MHz | |
| RX (AIS) | 162.025 MHz | |
| Usable channel groups | INT, USA, CAN, WX channels | |
| Type of emission | 16K0G3E (FM), 16K0G2B (DSC), 16K0GXW (GMSK) | |
| Current drain (at 7.2 V DC) |
TX (6 W/1 W output) | 1500 mA/700 mA (approx.) |
| RX (Inter SP/Exter SP Max. audio) | 700 mA/350 mA (approx.) | |
| Operating temperature range | –20°C to +60°C; –4˚F to +140˚F | |
| Antenna impedance | 50 Ω | |
| Dimensions (W×H×D) (Projections not included) |
60.9 × 145.8 × 43.8 mm; 2.4 × 5.7 × 1.7 in |
|
| Weight (approximately) | 357 g ; 12.6 oz (With BP-306, antenna, MB-133) |
|
Transmitter
| Output power (Hi/Low) | 6 W/1 W | |
|---|---|---|
| Max. frequency deviation | ±5 kHz | |
| Frequency stability | ±10 ppm | |
| Spurious emissions | –68 dBc typical | |
Receiver
| Sensitivity (at 12 dB SINAD) DSC receiver (at 1% BER) AIS receiver (at 20% PER) |
0.25 μV typical –3 dBμ emf typical –107 dBm |
|
|---|---|---|
| Squelch sensitivity (Threshold) | 0.25 μV typical | |
| Adjacent channel selectivity DSC receiver (at 1% BER) AIS receiver (at 20% PER) |
70 dB typical 73 dBμ emf 50 dB typical |
|
| Spurious response DSC receiver (at 1% BER) AIS receiver (at 20% PER) |
70 dB typical 73 dBμ emf 50 dB typical |
|
| Intermodulation DSC receiver (at 1% BER) AIS receiver (at 20% PER) |
70 dB typical 68 dBμ emf 50 dB typical |
|
| Hum and noise | 40 dB | |
| Audio output power (at 10% distortion) |
Internal SP | 1500 mW typical (8 Ω load) |
| External SP | 350 mW typical (8 Ω load) | |
Measurements made in accordance with TIA/EIA-603. All stated specifications are subject to change without notice or obligation.
Applicable U.S. Military Specifications & IP Rating
| Standard | MIL-810 G | |
|---|---|---|
| Method | Procedure | |
| Low Pressure | 500.5 | I, II |
| High Temperature | 501.5 | I, II |
| Low Temperature | 502.5 | I, II |
| Temperature Shock | 503.5 | I-C |
| Solar Radiation | 505.5 | I |
| Rain Blowing/Drip | 506.5 | I, III |
| Humidity | 507.5 | II |
| Salt Fog | 509.5 | – |
| Dust Blowing | 510.5 | I |
| Immersion | 512.5 | I |
| Vibration | 514.6 | I |
| Shock | 516.6 | I, IV |
Also meets equivalent MIL-STD-810-C, -D, -E and -F.
| Ingress Protection Standards | |
|---|---|
| Water | IPX7 (Waterproof protection) |
All stated specifications are subject to change without notice or obligation.
Supplied Accessories
- BP-306 battery pack
- BC-251 battery charger
- AC adapter*
- CP-26 cigarette lighter cable
- MB-133 belt clip
- Antenna
- Hand strap
* May differ depending on version




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