IC-475

440MHZ/FM/CW/SSB/TRANSCEIVER
(A-USA VERSION, E-EUROPEAN VERSION, H-75W VERSION)

MFR: ICOM

FREQUENCY COVERAGE: IC-475A: 430-450 MHZ
IC-475E: 430-440 MHZ
FREQUENCY RESOLUTION: 1KHZ

POWER SUPPLY/CURRENT: 13.8V IC-475A/E HI 5A, LOW 2.5A

DIMENSIONS 9.5W X 3.7H X 9.4D INCHES

O/P POWER IC-475A/E: HI 25W; LOW 1W

EMISSIONS: SSB, FM, CW

SENSITIVITY FM: <0.18UV @ 12DB SINAD; <0.12UV @ 20DB
SINAD; SSB,CW:<0.1UV @10DB SINAD

AUDIO OUTPUT: >2W

MISC: 99 MEMORIES, SCANNING, PRIORITY CHANNELS, DIRECT DIGITAL SYNTHESIZER,
COMMUNICATIONS INTERFACE.
OPTIONS:
DESK MICK, EXTERNAL PREAMP, SPEAKERS, SCANNING DTMF MIC, POWER SUPPLY

 ICOM   IC-475
~~~~~~~~~~~~~~~
440MHZ/FM/CW/SSB/TRANSCEIVER
(A-USA VERSION, E-EUROPEAN VERSION, H-75W VERSION)


FREQUENCY COVERAGE: IC-475A: 430-450 MHZ
IC-475E: 430-440 MHZ
FREQUENCY RESOLUTION: 1KHZ

POWER SUPPLY/CURRENT: 13.8V IC-475A/E HI 5A, LOW 2.5A

DIMENSIONS 9.5W X 3.7H X 9.4D INCHES

O/P POWER IC-475A/E: HI 25W; LOW 1W

EMISSIONS: SSB, FM, CW

SENSITIVITY FM: <0.18UV @ 12DB SINAD; <0.12UV @ 20DB
SINAD; SSB,CW:<0.1UV @10DB SINAD

AUDIO OUTPUT: >2W

MISC: 99 MEMORIES, SCANNING, PRIORITY CHANNELS,DIRECT DIGITAL SYNTHESIZER,
COMMUNICATIONS INTERFACE.
OPTIONS:
DESK MICK, EXTERNAL PREAMP, SPEAKERS,SCANNING DTMF MIC, POWER SUPPLY
 

 ICOM IC-475
~~~~~~~~~~~~~~

TUNING STEPS CHANGE FOR ICOM IC-475

The IC-475 FM-Step select matrix use these diodes on the front unit:
(type 1SS53) D41, D42, D43, D44, (D45), D46

Note: diode D45 is not present but solder holes exist for it on the board
just between D44 e D46

installed diodes are marked with X :

(*) (*)
D41 D42 D43 D44 D45 D46 D48 Steps DB4 DB5 DB6 DB7
. . . . . . . 10.0 Hz
. . . X . . . 100.0 Hz 1 0 0 0
. X . . . . . 1.0 KHz 0 0 1 0
X . X . 5.0 KHz 1 0 1 0
. . . . X . . 10.0 KHz 0 1 0 0
. . . (*) X X . 12.5 KHz (*) 1 1 0
. . . . . . X 25.0 KHz 0 0 0 1
X . X . . . . 1.0 MHz 0 1 0 1


(*) To set a step of 12.5 KHz in FM mode (TS button off) it is not necessary disconnect the diode D44, just insert the diode D45 (IN4148 or similar) near D44 and "voil les jeux sont faits". Unscrew the two lateral screws and unlock the front panel.
Remove also all the connectors of the front board and after that unscrew ALL the screws of the metallic shield covering the front board. it seems too much complicated insert the diodes from the component side of the front board, so it is better insert D45 from the solder side.
 

AUDIO FIX FOR IC-27, 37, 47

Ed Richley KD9KZ fo Naples, FL has a very good article on improving the audio treble and output power for these popular mobile radios. Capacitor C-67, from .01 to .00 uf and
Resistor R-31, from 150 ohm to 270 ohm, are the components that are changed in the IC-27A two meter model and some comparison to the 220 and 440 schematic should show if these are the same parts in all three rigs. So for more details see Ham Radio Page 61 for Feb. 1986 and improve the one complaint about this model. I will do mine when time allows.