Icom IC-821H Instruction Manual

Pages 60

Year 1996

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of 60

Icom IC-821H Transceiver Specification

The Icom IC-821H Transceiver is a high-performance dual-band radio designed for amateur radio enthusiasts, offering robust functionality on both 2-meter and 70-centimeter bands. This transceiver operates on VHF and UHF frequencies, providing 144-146 MHz and 430-440 MHz coverage, respectively, with a power output of 45 watts on VHF and 35 watts on UHF. It features dual receive capabilities, enabling simultaneous reception of two frequencies, which enhances communication flexibility for operators.

The IC-821H is equipped with a sophisticated PLL synthesizer, ensuring precise frequency stability and a wide frequency range. Its advanced circuitry includes a built-in DSP (Digital Signal Processor) that enhances audio clarity by reducing noise and improving signal-to-noise ratios. The transceiver also boasts a dynamic range of over 100 dB, offering clear reception even in challenging RF environments.

A large, easy-to-read LCD display provides key information at a glance, including frequency, mode, and signal strength. The intuitive interface is complemented by a comprehensive set of controls, facilitating seamless band switching and mode selection. The IC-821H supports various operating modes, including FM, SSB, CW, and digital modes, making it versatile for different communication needs.

For enhanced connectivity, the transceiver includes multiple I/O ports, allowing integration with external devices such as computers and amplifiers. The unit's compact design ensures it fits comfortably in most operating environments, while its sturdy construction guarantees durability. Additional features include a built-in electronic keyer for CW operation, memory channels for quick access to preferred frequencies, and a customizable scan function. The Icom IC-821H is engineered to deliver reliable performance and exceptional versatility for amateur radio operators seeking a comprehensive communication solution.

Icom IC-821H Transceiver F.A.Q.

How can I reset the Icom IC-821H to factory settings?

To reset the Icom IC-821H to factory settings, turn off the transceiver, then press and hold the [LOCK] and [M/S] buttons while turning the power back on. This will restore the original factory settings.

What is the best way to connect an external antenna to the IC-821H?

Connect the external antenna to the appropriate antenna jack (ANT1 for VHF and ANT2 for UHF) on the rear panel using a coaxial cable with a PL-259 connector. Ensure the antenna is properly tuned for the frequency band in use.

How do I adjust the power output on the Icom IC-821H?

To adjust the power output, press the [PWR] button, then use the main dial to select the desired power level. The transceiver allows you to choose between high, medium, and low power settings.

What should I do if the IC-821H is not transmitting audio?

First, check the microphone connection and ensure it is properly inserted. Verify that the microphone's PTT switch is functioning. Additionally, inspect the mic gain settings and ensure they are not set too low.

How can I perform a basic frequency calibration on the IC-821H?

To perform a basic frequency calibration, use a known frequency source or standard. Access the service menu by pressing and holding certain buttons as outlined in the service manual, then adjust the frequency settings as needed.

How do I store a frequency in memory on the Icom IC-821H?

First, select the desired frequency, mode, and settings. Press and hold the [MW] (Memory Write) button, then use the main dial to choose the memory channel where you want to store the frequency. Release the [MW] button to save.

What maintenance steps should be taken to ensure optimal performance of the IC-821H?

Regularly clean the exterior with a soft, dry cloth. Check connections for corrosion and ensure the antenna is properly tuned. Periodically update the firmware if updates are available and recalibrate the frequency as needed.

How can I resolve intermittent power issues with the IC-821H?

Check the power supply and ensure it provides the correct voltage and current. Inspect the power cable for damage or loose connections. If the problem persists, consider contacting a professional for internal inspection.

What modes are available on the Icom IC-821H, and how do I switch between them?

The IC-821H supports various modes, including SSB, CW, FM, and AM. To switch modes, press the [MODE] button repeatedly until the desired mode appears on the display.

How do I adjust the squelch setting on the IC-821H?

Turn the [SQL] knob clockwise until the background noise disappears. Adjust further to eliminate weak signals or interference while still allowing strong signals to be heard.