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IPX8 Submersible PLUS (1.5m depth for 30 minutes) The IC-M503 withstands submersion in up to 1.5m depth of water for 30 minutes. It is equivalent to the IPX8 standard. All products are rigorously checked to pass the quality test at the factory. Large LCD with dot-matrix characters The IC-M503 has a 168-charactor, full-dot matrix display that allows you to easily view a variety of information, such as GPS data, DSC emergency data, etc. The large buttons and knobs provide user friendly operation. ITU Class D DSC The IC-M503 has built-in class D DSC, which enables you to constantly monitor channel 70. This functionality provides users at sea with the peace of mind that they can call for help by pressing the “Distress” button if the need arises. Position Request and Position 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 navigation equipment*. In addition, the polling (request/ reply) function checks whether a specific ship is within the communications range. * External GPS receiver and navigation equipments which accept NMEA 0183 format are required. Superior receiver performance The IC-M503 has excellent receive specifications of 80dB (typical) for intermodulation rejection, adjacent channel selectivity, and 0.22µV (typical) high sensitivity. The IC-M504’s superior receiver provides excellent resistance to intermodulation and allows you to catch a weak signal between strong stations. Excellent audio output power The extra large speaker is mounted into a well spaced housing, producing greater sound than the specified 4.5W output power. You can get clear and loud reception without requiring repetition of the message, even over the engine or other background noise. 25W hailer/RX speaker and auto foghorn When connected to a hailer horn or external speaker on the deck or tower, you can make an announcement on-board from the microphone. The RX speaker function, “receiver-repeater”, allows you to monitor the received audio. Four foghorn patterns are also available for the automatic foghorn. Rear panel microphone version* With this version, the microphone connector is drawn from the rear panel and a 6.1m (20ft) microphone extension cable is supplied to allow you clean and neat panel installation. Technical details Frequency range Tx Rx 156.025 - 157.425MHz 156.050 - 163.275MHz Type of emission 16K0G3E, 16K0G2B Usable channels USA, INT, CAN, WX channels Power supply requirement 13.8V DC ±15% Current drain (at 13.8V DC) Transmit Receive 5.5A (25W output) 1.5A (Max. AF) Operating temperature range –20°C to +60°C; –4°F to +140°F Antenna impedance 50O (SO-239) Dimensions (W×H×D) (projections not included) 165 × 110 × 123.2 mm 61/2×411/32×427/32 in. Weight (approx.) 1.45kg; 3.20 lb NMEA formats Input Output RMC, CGA, GNS, GLL DSC, DSE Transmitter Output power 25W or 1W (at 13.8V DC) Modulation system Variable reactance Max. freq. deviation ± 5.0kHz Frequency error ± 10.0ppm Spurious emissions Less than -70dBc (at 25W) Residual modulation More than 40dB Adjacent channel power More than 70dB Receiver Intermediate freq. 1st 2nd 21.7MHz 31.05MHz (Ch 70) 450KHz Sensitivity 0.22µV typical (at 12db SINAD) Squelch sensitivity 0.32µV typical (threshold) Adjacent Ch. selectivity 80dB typical (DSC 75dB) Spurious response 80dB typical (DSC 75dB) Intermodulation rejection 80dB typical (DSC 75dB) Hum and noise ratio More than 40dB Audio output power 4.5W typ. at 10% distortion with a 4O load
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