Icom IC-F3GS service manual Sensitivity, Squelch, Level, Sql

Page 17

SOFTWARE ADJUSTMENT – continued

Select an operation using [] / [] keys, then set specified value using [] / [] keys on the connected computer keyboard.

ADJUSTMENT

 

ADJUSTMENT CONDITION

 

MEASUREMENT

VALUE

 

 

 

 

UNIT

LOCATION

 

 

 

 

 

 

 

 

 

 

 

 

 

RX

1

• Operating frequency: 146.000 MHz

Top

Connect a SINAD meter with an

Minimum distortion

SENSITIVITY

 

• Connect a standard signal generator to

panel

8Ω load to the [SP] jack.

level

[BPF T1] –

 

the antenna connector and set as:

 

 

 

[BPF T4]

 

Frequency

: 146.000 MHz

 

 

 

 

 

 

Level

: 3.2 µV* (–97 dBm)

 

 

 

 

 

 

Modulation

: 1 kHz

 

 

 

 

 

 

Deviation

: ±3.5 kHz (W-type)

 

 

 

 

 

 

 

±1.75 kHz (N-type)

 

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

CONVENIENT: The BPF T1–BPF T4 can be adjusted automatically.

q-1: Set the cursol to “BPF ALL” on the adjustment program and then push [ENTER] key.

q-2: The connected PC tunes BPF T1–BPF T4 to peak levels. or

w-1: Set the cursol to one of BPF T1, T2, T3, or T4 as desired.

w-2: Push [ENTER] key to start tuning.

w-3: Repeat w-1 and w-2 to perform additional BPF tuning.

SQUELCH

1

• Operating frequency: 146.000 MHz

Top

Connect a SINAD meter with an

12 dB SINAD

LEVEL

 

• Connect a standard signal generator to

panel

8Ω load to the [SP] jack.

 

[SQL]

 

the antenna connector and set as:

 

 

 

 

 

Frequency

: 146.000 MHz

 

 

 

 

 

Level

: OFF

 

 

 

 

 

Modulation

: 1 kHz

 

 

 

 

 

Deviation

: ±3.5 kHz (W-type)

 

 

 

 

 

 

±1.75 kHz (N-type)

 

 

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

2

• Receiving

 

 

 

At the point where

 

 

 

 

 

 

the audio signals

 

 

 

 

 

 

just appears.

 

 

 

 

 

 

 

*The output level of the standard signal generator (SSG) is indicated as the SSG’s open circuit.

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Image 17
Contents VHF FM Transceivers Repair Notes IntroductionOrdering Parts Table of Contents ‘ General Section Specifications‘ Transmitter ‘ ReceiverBottom View Inside ViewsMain Unit TOP View Disassembly Instruction Disassembly and Option InstructionsRemoving the Chassis Panel Removing the Main UnitSponge Optional Unit InstallationsReceiver Circuits Circuit DescriptionTransmitter Circuits PLL Circuit Power Supply Circuits Voltage LineVCC OPTOutput Expander IC IC10 Port AllocationsPreparation Adjustment ProceduresClone SPEGND PLL Adjustment Software Adjustment DC Power SupplyPLL Lock PLL AdjustmentMain VoltageSoftware Adjustment Squelch SensitivityLevel SQLMain Unit Parts ListVariable Ceramic JB 1C Accessories Mechanical Parts and DisassemblyChassis Parts EP1 EP2 MP1 MP2IC-F3GS parts Diodes SEMI-CONDUCTOR InformationTransistor and FET’S Main Unit Board LayoutsIC8 FI2IC5 CirqBlLOCK Diagram IC3C Voltage DiagramIC1 DTA144EU Avref Vtref Toned Tonem Avcc Section Voltage Diagram16, Kamihigashi, Hirano-ku, Osaka 547-0002, Japan 16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan
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