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Icom IC-910H service manual CR-293 High Stability Crystal Unit

Models: IC-910H

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• CR-293 HIGH STABILITY CRYSTAL UNIT

qRemove the bottom cover as shown in the diagram on p. 3-1.

•Remove the UX-910 if you have installed it. (p. 3-1) w Remove 6 screws from the PLL shield cover, then lift up

the PLL shield cover.

PLL shield cover

eDisconnect the FFC (Flexible Flat Cable) from the DIS- PLAY unit and the connection cable connectors from J501 and J1051 on the MAIN unit.

rRemove 5 screws from the PLL unit, then lift up the PLL unit.

tUnsolder the original reference crystal, then remove it.

•The original reference crystal unit is soldered at both top and bottom sides of the PCB (Printed Circuit Board).

yInstall the CR-293 and solder the leads.

uReturn the PLL unit, PLL shield cover and bottom cover to their original positions.

Original crystal soldering point

CR-293soldering points

Unsolder the original crystal.

CR-293

Original crystal

J501

J1051

Flexible flat cable

3 - 4

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Icom IC-910H service manual CR-293 High Stability Crystal Unit
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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.