Icom IC-910H Adjustment Procedures, Preparation Before Sarvicing, Required Test Equipment

Page 19

SECTION 5 ADJUSTMENT PROCEDURES

4-1 PREPARATION BEFORE SARVICING

■REQUIRED TEST EQUIPMENT

EQUIPMENT

GREDE AND RANGE

EQUIPMENT

GREDE AND RENGE

 

 

 

 

 

 

DC power supply

Output voltage

: 13.8 V DC

Audio generator

Frequency range

: 300–3000 Hz

Current capacity

: 30 A or more

Measuring range

: 1–500 mV

 

 

 

 

 

 

 

 

 

Measuring range

: 1–150 W

Standard signal

Frequency range

: 0.1–1500 MHz

RF power meter

Frequency range

: 120–1500 MHz

Output level

: 0.1 µV–32 mV

generator (SSG)

(terminated type)

Impedance

: 50 Ω

 

(–127 to –17 dBm)

 

 

 

SWR

: Less than 1.2 : 1

 

 

 

 

AC millivoltmeter

Measuring range

: 10 mV–10 V

 

 

 

 

Frequency range

: 0.1–100 MHz

 

 

 

 

 

DC voltmeter

Input impedance

: 50 kΩ/V DC or better

Frequency counter

Frequency accuracy

: ±0.5 ppm or better

 

 

 

 

Sensitivity

: 100 mV or better

DC ammeter

Measurement capability: 1 A/30 A

 

Frequency range

: 0.1–500 MHz

 

 

 

RF voltmeter

Spectram analyzer

Frequency range

: At least 150 MHz

Measuring range

: 0.01–10 V

Spectraum bandwidth

: 100 kHz or more

 

 

 

 

 

 

 

 

FM deviation meter

Frequency range

: DC–500 MHz

Attenuator

Power attenuation

: 50 or 60 dB

Measuring range

: 0 to ±5 kHz

Capacity

: 150 W or more

 

 

 

 

 

 

 

 

Distortion meter

Frequency range

: 1 kHz ±10 %

External speaker

Input impedance

: 8 Ω

Measuring range

: 1–100 %

Capacity

: 5 W or more

 

 

Oscilloscope

Frequency range

: DC–20 MHz

Terminator

Resistance

: 50 and 150 Ω

Measuring range

: 0.01–20 V

Capacity

: 150 W or more

 

 

Digital multimeter

Imput impeadance

: 10 MΩ/DC or beter

 

 

 

 

 

 

 

 

 

‘CONNECTIONS

CAUTION !

DO NOT transmit while an SSG is connected to the antenna connector.

CAUTION !

When [P.AMP] switch is turned ON, DC voltage is applied to the antenna connector. This may damege the signal generator.

Standard signal

generator

DC power supply

Ammeter

to [DC 13.8 V]

connector

Attenuator

FM deviation meter

Spectrum analyzer

Distortion meter

to [EXT SP]

the antenna

RF power meter

Speaker

TERMINATOR for software adjustment (page 5-12).

2-conductor 3.5 (d) mm (1/8") Shouten inner and outer plugs.

IC-910H

Audio generator

,.

[MIC]

PTT

to

JIG cable (A)

2.2 k

JIG cable (B)

+9 V

2.2 k

5 - 1

Page 18 Page 20
Image 19
Page 18 Page 20
Contents Service Manual EUR IntroductionOrdering Parts Repair NotesTable of Contents General SpecificationsReceiver FM if IC SectionInside Views Main and PLL UnitsPA Unit Bottom View TOP ViewPLL IC Opening the transceiver’s case Disassembly and Option InstructionsUX-910 1200MHz Band Unit FL-132/FL-133 CW Narrow Filter Opening the PA unit coverMain SUB UT-106 DSP Unit Installing 1st DSP unit front panel sideInstalling 2nd DSP unit rear panel side UT-102 Voice Synthesizer UnitCR-293 High Stability Crystal Unit Receiver Circuit Circuit DescriptionSquelch Circuit Main Unit 6 10 MHz if Circuit Main UnitDemodulator Circuit Main Unit Squelch Control Circuit Main UnitMeter Circuit Main Unit Transmitter CircuitsNoise Blanker Circuit Main Unit AGC Circuit Main UnitRF Circuit PA Unit Transmit if Amplifier Circuit Main UnitModulation Circuit Main Unit CW Keying Circuit Main UnitPLL Circuits 7 1LO PLL Circuit PLL Circuits8 2LO PLL Circuit ‘ Connections Adjustment ProceduresPreparation Before Sarvicing Required Test EquipmentFrequency Adjustment PLL AdjustmentsPLL and Main Units Receiver Adjustments L354 R360 R547P501 L353Main Band OFF EXTNoise BlankerCP852 L283L22 CP851Transmitter Adjustments R131 R503C659 R138LO Leak If TotalMain Gain GNDR1613 R504R202 CP1613Software Adjustment Meter Software AdjustmentNoise SQL Calibration FilterTX Power HPF OFF DeviationLPF UX-910 Adjustments R13 CP321CP322 C332APC Power SETPre-setting for APC adjustment Front Unit Section Parts ListDisplay Board Resistor ERA3YED VR-A Board Func BoardVR-B Board PLL Unit RIT BoardJack Board MIC BoardResistor ERA3YEB Thermistor Tantalum ECST1AD107R REG BA09T Main UnitDiode DAN222TL Resistor ERA3YKD R364 7030003320 R915 7030003520 Tantalum Temsva 1C 335M-8L Electrolytic ECEV1EA4R7SR Electrolytic Relay Diode HSU88TRF Coil Eljre 15NG-F Resistor ERJ1WYJ181U Resistor ERJ1TYJ102U JB 1H JB 1C Mica BARISTOR-C Board DRV BoardBARISTOR-A Board VARISTOR-B BoardMain Unit UX-910 2UX-910MAIN UnitResistor RGB3L R15 Resister ERA3YED Tantalum ECST1CC226R CH 1H Connectot 25FMN-BTK Chassis Parts Mechanical PartsDisplay Unit Cover PartsUX-910 Unpacking UnpackingUX-910 Chassis Parts UX-910 Main UnitTransistors and FET’S SEMI-CONDUCTOR InformationDTA114 EE TL MA29B DiodesSection Board Layouts Page Icom America Inc 13714HZ-C1

IC-910H specifications

The Icom IC-910H is a highly regarded and versatile transceiver that is designed for amateur radio operators who are particularly interested in V/UHF and microwave communications. Known for its exceptional performance, the IC-910H encompasses a suite of features that make it a standout choice for both casual and dedicated hams.

One of the main features of the IC-910H is its dual-band capability, allowing for simultaneous operation on both 144 MHz (2 meters) and 430 MHz (70 centimeters) bands. This dual operation enables users to engage in various communication modes, including SSB, CW, FM, and digital. Its high frequency stability ensures that users can rely on the transceiver for accurate and consistent transmissions.

The IC-910H is equipped with a high-performance 10 MHz IF filter that improves selectivity and reduces adjacent channel interference. The optional 1.2 GHz module enhances the transceiver’s capabilities, allowing operators to venture into microwave frequencies. This expandability is a significant advantage for users who wish to progress in their amateur radio pursuits.

Another notable aspect of the IC-910H is its large, easy-to-read LCD display, which features various color options for enhanced visibility. The front panel layout is user-friendly, providing quick access to important controls and functions. The built-in DSP (Digital Signal Processing) technology offers noise reduction and filtering capabilities, significantly improving overall audio quality and making weak signals more intelligible.

The transceiver also includes extensive memory functions, with up to 1,000 memory channels available for storing frequencies, modes, and operational settings. Additionally, it supports CTCSS and DCS tones, which facilitate the use of repeater systems and private group communications.

In terms of build quality, the IC-910H features a robust construction designed for durability and long-term use. Its efficient power supply management ensures excellent performance while minimizing heat generation, making it suitable for extended operating sessions.

Overall, the Icom IC-910H is a powerful and feature-rich transceiver that is favored by many amateur radio enthusiasts. With its versatile operating modes, advanced filtering capabilities, and clear display, it stands out as a reliable tool for both casual operators and serious DXers. Its well-thought-out design and comprehensive features make it a valuable addition to any ham's station collection.
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