Icom IC-910H service manual Software Adjustment

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5-6 SOFTWARE ADJUSTMENT

ADJUSTMENT

ADJUSTMENT CONDITION

DISPLAY

 

OPERATION

 

 

 

 

 

ENTERING 1

• Enter software adjustment mode:

 

 

The display shows the selection

 

 

SOFTWARE

1 Turn power OFF.

 

 

item scleen for the adjustment

ADJUSTMENT

2 Terminate the [REMOTE] jack with a

 

 

mode, push [0]–[9] key to select

 

3.5(d) mm mini-plug.

 

 

adjustment item. Once enterring

 

3 While pushing [RIT] and [SATELLITE]

 

 

adjustment mode, use [UP]/[DOWN]

 

keys, turn power ON.

 

 

key to skip/back items, or [ENT] to

 

 

 

 

return the selection item screen.

 

 

 

 

 

CAUTION:

NEVER select ajustment items [6]–[9] key on the selection item screen while transceiver is connected to an SSG. Because transceiver automatically transmits when transmit items [6]–[9] is selected.

ADJUSTMENT

1

• Push [0] to enter the volume center set-

 

 

Push [RIT] key to set the volume

ITEM (0)

 

ting.

 

 

 

center positions, and to step next.

VOLUME

 

• Set the [RIT] and [SHIFT] controls to cen-

 

 

 

CENTER

 

ter.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLL UNLOCK

1

• Wait for a while.

 

 

USB

Verify the unlock detection for VHF

 

 

 

 

 

 

by blinking the frequency on the dis-

 

 

 

 

 

 

play, then push [RIT] key to step

 

 

 

 

 

 

next.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

USB

Verify the unlock detection for UHF

 

 

 

 

 

 

by blinking the frequency on the dis-

 

 

 

 

 

 

play, then push [RIT] key to exit vol-

 

 

 

 

 

 

ume center setting to selection item

 

 

 

 

 

 

screen.

 

 

 

 

 

 

 

ADJUSTMENT

1

• Push [1] to enter the receiver adjustment.

 

 

Push [RIT] key to tune the “144 tune

 

USB

ITEM (1)

 

• Connect a standard signal generator to

 

 

1”, and to step next.

TUNED BPF

 

[VHF ANT] connector and set as:

 

 

 

(for 144 M)

 

Frequency

: 136.02150 MHz

 

 

 

 

 

Level

: 50 µV* (–73 dBm)

 

 

 

 

 

Modulation

: OFF

 

 

 

 

 

 

 

 

Receiving

 

2 • Set an SSG as

:

USB

Push [RIT] key to tune the “144 tune

 

Frequency

: 146.02150 MHz

 

2”, and to step next.

 

Level

: 50 µV* (–73 dBm)

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 • Set an SSG as

:

USB

Push [RIT] key to tune the “144 tune

 

Frequency

: 146.02150 MHz

 

3”, and to step next.

 

Level

: 50 µV* (–73 dBm)

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

(for 430 M)

4 • Set an SSG as

:

USB

Push [RIT] key to tune the “430 tune

 

 

 

 

 

Frequency

: 420.02150 MHz

 

1”, and to step next.

 

Level

: 50 µV* (–73 dBm)

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

5 • Connect an SSG to [UHF ANT] connector

USB

Push [RIT] key to tune the “430 tune

 

and set as

:

 

2”, and to step next.

 

Frequency

: 440.02150 MHz

 

 

 

Level

: 50 µV (–73 dBm)

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6 • Set an SSG as

:

 

Push [RIT] key to tune the “430 tune

 

USB

 

Frequency

: 479.98150 MHz

 

3”.

 

Level

: 50 µV* (–73 dBm)

 

Turn power OFF and ON to return

 

• Receiving

 

 

 

 

 

the normal operation mode. Then

 

 

 

 

 

 

 

 

start the receiver adjustments (page

 

 

 

 

 

 

 

 

5-3).

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

5 - 12

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Contents Service Manual Repair Notes IntroductionOrdering Parts EURTable of Contents Specifications GeneralReceiver Main and PLL Units SectionInside Views FM if ICPA Unit TOP View Bottom ViewPLL IC Disassembly and Option Instructions Opening the transceiver’s caseUX-910 1200MHz Band Unit Opening the PA unit cover FL-132/FL-133 CW Narrow FilterMain SUB UT-102 Voice Synthesizer Unit Installing 1st DSP unit front panel sideInstalling 2nd DSP unit rear panel side UT-106 DSP UnitCR-293 High Stability Crystal Unit Circuit Description Receiver CircuitSquelch Control Circuit Main Unit 6 10 MHz if Circuit Main UnitDemodulator Circuit Main Unit Squelch Circuit Main UnitAGC Circuit Main Unit Transmitter CircuitsNoise Blanker Circuit Main Unit Meter Circuit Main UnitCW Keying Circuit Main Unit Transmit if Amplifier Circuit Main UnitModulation Circuit Main Unit RF Circuit PA UnitPLL Circuits PLL Circuits 7 1LO PLL Circuit8 2LO PLL Circuit Required Test Equipment Adjustment ProceduresPreparation Before Sarvicing ‘ ConnectionsPLL Adjustments Frequency AdjustmentPLL and Main Units Receiver Adjustments L353 R547P501 L354 R360Blanker EXTNoise Main Band OFFCP851 L283L22 CP852Transmitter Adjustments R138 R503C659 R131GND If TotalMain Gain LO LeakCP1613 R504R202 R1613Software Adjustment Software Adjustment MeterNoise SQL Filter CalibrationTX Power Deviation HPF OFFLPF UX-910 Adjustments C332 CP321CP322 R13Power SET APCPre-setting for APC adjustment Section Parts List Front UnitDisplay Board Resistor ERA3YED Func Board VR-A BoardVR-B Board MIC Board RIT BoardJack Board PLL UnitResistor ERA3YEB Thermistor Tantalum ECST1AD107R Main Unit REG BA09TDiode 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 VARISTOR-B Board DRV BoardBARISTOR-A Board BARISTOR-C Board2UX-910MAIN Unit Main Unit UX-910Resistor RGB3L R15 Resister ERA3YED Tantalum ECST1CC226R CH 1H Connectot 25FMN-BTK Cover Parts Mechanical PartsDisplay Unit Chassis PartsUX-910 Main Unit UnpackingUX-910 Chassis Parts UX-910 UnpackingSEMI-CONDUCTOR Information Transistors and FET’SDTA114 EE TL Diodes MA29BSection 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.