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SECTION 1

SPECIFICATIONS 

GENERAL

• Frequency coverage

: 440.000–470.000 MHz

• Type of emission

: 8K50F3E

• Number of channels

: 32 ch (16 channels 

×

2 banks: 2-BANK version), 16 ch (16 channel version)

• Power supply requirement

: 7.2 V DC (negative ground; supplied battery pack)

• Current drain (approx.)

: Transmit

at High (4.0 W)

1.55 A

at Low (1.0 W)

800 mA

Receive

rated audio

250 mA

stand-by

70 mA

• Frequency stability

: ±0.00025 %

• Usable temperature range

: –30˚C to +60˚C; –22˚F to +140˚F

• Dimensions (projections not included)

: 54(W) 

× 

132(H) 

× 

35(D) mm; 2 

5

32

(W) 

× 

3

16

(H) 

× 

3

8

(D) in.

• Weight (with ant., BP-209)

: 355 g; 12.5 oz.

TRANSMITTER

• RF output power (at 7.2 V DC)

: 4 W / 1 W (High / Low)

(with supplied battery pack)

• Modulation system

: Variable reactance frequency modulation

• Maximum frequency deviation

: ±2.5 kHz

• Spurious emissions

: 73 dBc (typical)

• Adjacent channel power

: 60 dB (typical)

• Transmitter audio distortion

: Less than 3% at 1 kHz, 40% deviation

• Limitting charact of modulator

: 70–100% of max. deviation

• Ext. microphone connector

: 3-conductor 2.5(d) mm (

1

10

”)/2.2 k

RECEIVER

• Receive system

: Double conversion superheterodyne system

• Intermediate frequencies

: 1st

46.35 MHz

2nd

450 kHz

• Sensitivity

: 0.3 µV at 12 dB SINAD (typical)

• Squelch sensitivity

: 0.3 µV at threshold (typical)

• Adjacent channel selectivity

: 65 dB (typical)

• Spurious response rejection

: 70 dB (typical)

• Intermodulation rejection ratio

: 70 dB (typical)

• Hum and noise

: 40 dB (typical)

• Audio output power (at 7.2 V DC)

: 500 mW typical at 5% distortion with an 8 

load

• Ext. speaker connector

: 3-conductor 3.5(d) mm (

1

8

”)/8 

Specifications are measured in accordance with EIA/TIA-603.

All stated specifications are subject to change without notice or obligation.

Summary of Contents for IC-F4GS

Page 1: ...SERVICE MANUAL UHF FM TRANSCEIVERS ...

Page 2: ... F4GT MAIN UNIT 1 pieces 8810009510 Screw BT M2 x 4 NI ZU IC F4GS Chassis 10 pieces Addresses are provided on the inside back cover for your convenience 1 Make sure a problem is internal before disassembling the transceiver 2 DO NOT open the transceiver until the transceiver is disconnected from its power source 3 DO NOT force any of the variable components Turn them slowly and smoothly 4 DO NOT s...

Page 3: ...OWER SUPPLY CIRCUITS 4 3 4 5 CPU PORT ALLOCATIONS 4 4 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION 5 1 5 2 PLL ADJUSTMENT 5 4 5 3 SOFTWARE ADJUSTMENT 5 5 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS AND DISASSEMBLY SECTION 8 SEMI CONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS SECTION 10 BC 137 OPTIONAL DESKTOP CHARGER INFORMATION 10 1 PARTS LIST 10 1 10 2 DISASSEMBLY INFORMATION 10 1 10 3 VOL...

Page 4: ... Maximum frequency deviation 2 5 kHz Spurious emissions 73 dBc typical Adjacent channel power 60 dB typical Transmitter audio distortion Less than 3 at 1 kHz 40 deviation Limitting charact of modulator 70 100 of max deviation Ext microphone connector 3 conductor 2 5 d mm 1 10 2 2 kΩ RECEIVER Receive system Double conversion superheterodyne system Intermediate frequencies 1st 46 35 MHz 2nd 450 kHz ...

Page 5: ...7030000500 S RESISTOR MCR10EZHJ 10 kΩ 1 R6 7030000190 S RESISTOR MCR10EZHJ 27 Ω 270 1 R7 7030001740 S RESISTOR MCR10EZHJ 2 kΩ 1 R8 7030001740 S RESISTOR MCR10EZHJ 2 kΩ 1 R9 7030000590 S RESISTOR MCR10EZHJ 56 kΩ 1 R10 7030000500 S RESISTOR MCR10EZHJ 10 kΩ 1 R11 7030000380 S RESISTOR MCR10EZHJ 1 kΩ 1 C1 4030001150 S CERAMIC GRM40 F 104Z 25PT 1 C2 4030001150 S CERAMIC GRM40 F 104Z 25PT 1 C3 403000115...

Page 6: ...6 9 16 Kamihigashi Hirano ku Osaka 547 0002 Japan S 13610IZ CD 2000 Icom Inc ...

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