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Specications
GENERAL
Frequency coverage :
Transmit 156.000161.450 MHz
Receive 156.000163.425 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
TRANSMITTER
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
RECEIVER
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 load
HM-134 2 W at 10% distortion with a 8 load
Options
DS-100 (#02)
DSC CONTROLLER
When the DS-100 is installed, the transceiver conforms to
DSC Class D for marine digital communications.
MB-75
FLUSH MOUNT
For mounting the transceiver to a panel.
HM-134
REMOTE
-
CONTROL MICROPHONE
External microphone-type controller. Provides optional inter-
com operation. 6 m (20 feet) microphone cable and mount-
ing base included. Black color is available.
OPC-999
MICROPHONE EXTENSION CABLE
6 m (20 feet) microphone extension cable for optional
HM-134. Up to 2 OPC-999 can be connected. (18 m; 60 feet
maximum)
SP-5
EXTERNAL SPEAKER
(IC-M503
ONLY
)
A large, external speaker for superior audio output.
SP-10
EXTERNAL SPEAKER
(IC-M503
ONLY
)
A compact, external speaker. Features easy installation.
UT-98
VOICE SCRAMBLER UNIT
UT-112
VOICE SCRAMBLER UNIT
Ensures private communications. 128 or 32 codes are
available. Not available in some countries.
11
SPECIFICATIONS AND OPTIONS
27
All stated specications are subject to change without notice or
obligation.
01 IC-M503-(1).qxd 01.12.17 5:00 PM Page 27 (1,1)
31


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