Icom IC-F3GS service manual Section Specifications, ‘ General, ‘ Transmitter, ‘ Receiver

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SECTION 1

SPECIFICATIONS

 

 

 

 

 

 

GENERAL

 

 

 

 

• Frequency coverage

 

: 136.000–150.000 MHz

 

• Type of emission

 

: 16K0F3E (W-type), 8K50F3E (N-type)

• 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 (5.0 W)

1.6 A

 

 

 

at Low (1.0 W)

700 mA

 

 

Receive

rated audio

250 mA

 

 

 

stand-by

70 mA

• Frequency stability

 

: ±0.0005 %

 

 

• Usable temperature range

 

: –30˚C to +60˚C; –22˚F to +140˚F

• Dimensions (projections not included)

: 54(W) 132(H) 35(D) mm; 2 532(W) 5 316(H) 1 38(D) in.

• Weight (with ant., BP-209)

 

: 370 g; 13.1 oz.

 

TRANSMITTER

 

 

 

 

• RF output power (at 7.2 V DC)

: 5 W / 1 W (High / Low)

 

(with supplied battery pack)

 

 

 

• Modulation system

 

: Variable reactance frequency modulation

• Maximum frequency deviation

: ±5.0 kHz (W-type), ±2.5 kHz (N-type)

• 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 (110”)/2.2 kΩ

RECEIVER

 

 

 

 

• Receive system

 

: Double conversion superheterodyne system

• Intermediate frequencies

 

: 1st

31.05 MHz

 

 

 

2nd

450 kHz

 

• Sensitivity

 

: 0.25 µV at 12 dB SINAD (typical)

• Squelch sensitivity

 

: 0.25 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 7.4 V DC)

: 500 mW typical at 5% distortion with an 8 Ω load

• Ext. speaker connector

 

: 3-conductor 3.5(d) mm (18”)/8 Ω

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

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

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Contents VHF FM Transceivers Ordering Parts IntroductionRepair Notes Table of Contents Section Specifications ‘ General‘ Transmitter ‘ ReceiverMain Unit TOP View Inside ViewsBottom View Disassembly and Option Instructions Disassembly InstructionRemoving the Chassis Panel Removing the Main UnitOptional Unit Installations SpongeCircuit Description Receiver CircuitsTransmitter Circuits Power Supply Circuits Voltage Line PLL CircuitVCC OPTPort Allocations Output Expander IC IC10Adjustment Procedures PreparationGND SPEClone Software Adjustment DC Power Supply PLL AdjustmentPLL Adjustment PLL LockMain VoltageSoftware Adjustment Sensitivity SquelchLevel SQLParts List Main UnitVariable Ceramic JB 1C Mechanical Parts and Disassembly AccessoriesChassis Parts EP1 EP2 MP1 MP2IC-F3GS parts Transistor and FET’S SEMI-CONDUCTOR InformationDiodes Board Layouts Main UnitFI2 IC8IC5 CirqBlLOCK Diagram Voltage Diagram IC3CIC1 DTA144EU Section Voltage Diagram Avref Vtref Toned Tonem Avcc16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan 16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan
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