ICOM IC-M503 User Manual

■ Specifications

• Frequency coverage 

:

Transmit 156.000–161.450 MHz
Receive 156.000–163.425 MHz

• Mode

: FM (16K0G3E)

• Channel spacing

: 25 kHz

• Current drain (at 13.8 V)

: TX high

6.0 A max.

Max. audio

1.5 A max.

• Power supply requirement

: 13.8 V DC (10.8 to 15.6 V)

• Frequency stability 

: ±10 ppm (–20°C to +60°C)

• Dimensions : 165(W)

×110(H)×109.4(D) mm

(Projection not included)

• Weight : 1130 

g

• Output power

: 25 W and 1 W

• Modulation system

: Variable reactance phase 

modulation

• Max. frequency deviation 

: ±5.0 kHz

• Spurious emissions

: Less than 0.25 µW

• Receive system

: Double conversion superheterodyne

• Sensitivity (20 dB SINAD)

: Less than –3dBµ EMF (typical)

• Squelch sensitivity

: Less than 0dBµ EMF

• Intermodulation rejection ratio : More than 68 dB
• Spurious response rejection ratio: More than 70 dB
• Adjacent channel selectivity : More than 70 dB
• Audio output power

:

IC-M503

2 W at 10% distortion with a 4 

Ω load

HM-134

2 W at 10% distortion with a 8 

Ω load

■ Options

When the DS-100 is installed, the transceiver conforms to
DSC Class D for marine digital communications.

For mounting the transceiver to a panel.

External microphone-type controller. Provides optional inter-
com operation. 6 m (20 feet) microphone cable and mount-
ing base included. Black color is available.

6 m (20 feet) microphone extension cable for optional
HM-134. Up to 2 OPC-999 can be connected. (18 m; 60 feet
maximum)

A large, external speaker for superior audio output.

A compact, external speaker. Features easy installation.

Ensures private communications. 128 or 32 codes are
available. Not available in some countries.

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