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Last modified 2025-01-13

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Icom IC-M503

A picture of Icom IC-M503

SPECIFICATIONS

GENERAL
Type:Marine VHF transceiver
Frequency range: TX: 156.000-161.450 MHz
RX: 156.000-163.425 MHz
Tuning steps:Channelized
Frequency stability:±10 ppm @ -20 to +60°C (-4 to +140°F)
Mode:FM
Channels / memory management: 57 international channels
Additional 58 US channels (UK version only)
Additional 59 Holland channels (Holland version only)
ATIS and DSC channels (FRG version only)
1 call
Alpha tags (Ten characters)
Duplex shift / offset:Automatic according to bandplan
Power supply:13.8 VDC (10.8-15.6 VDC)
Current drain / power consumption:RX: Max 1.5 A
TX: Max 6 A
Antenna impedance / connector:50 ohm / SO-239
Dimensions (W*H*D):165*110*109 mm (6.5*4.33*4.29")
Weight:1.13 Kg (2.49 lb)
Other features: Channel 16 button. Dual/triwatch. Scanning. Dimmer.
Intercom. DSC and scrambler options.




RECEIVER SECTION
Receiver system: Double conversion superheterodyne
1st IF: ? MHz
2nd IF: ? KHz
Sensitivity:0.71 uV (20 dB SINAD)
Squelch sensitivity:Less than 1 uV (Threshold)
Selectivity:70 dB (Adjacent channel)
Image rejection:
AF output power / speaker:2 W at 10% distortion / 4 ohm
External speaker connector:




TRANSMITTER SECTION
RF output power: High: 25 W
Low: 1 W
Modulation system:Variable reactance phase modulation
Max FM deviation (Factory set):±5 KHz
Spurious emissions:Less than 0.25 uW
Microphone impedance / connector:? ohm / ?-pin
Microphone input level:? mV




MISCELLANEOUS
Manufactured:Japan, 2001-200x (Discontinued)
Additional info:
Related documents:User manual (1.2 MB)
Modifications and fixes:
Reviews:
Options / Accessories:
DS-100
HM-132
MB-75
OPC-999
SP-5
SP-10
UT-98
UT-112
DSC controller
Remote control microphone
Flush mount
Microphone extension cable (For HM-134)
Large external speaker
Compact external speaker
Voice scrambler unit
Voice scrambler unit