Icom IC-820H Instruction Manual

Pages 52

Year 1994

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Icom IC-820H Transceiver Specification

The Icom IC-820H is a sophisticated dual-band transceiver designed for amateur radio enthusiasts, offering robust performance across the 144 MHz and 430 MHz frequency bands. It features a solid output power of 35 watts on both VHF and UHF, ensuring reliable communication over various distances. The transceiver is equipped with dual VFOs, allowing for seamless frequency management and operation across multiple bands. It supports a wide frequency coverage, catering to both the 2-meter and 70-centimeter bands, which are popular among amateur radio operators.

The IC-820H is engineered with an advanced PLL (Phase-Locked Loop) circuit that provides high-frequency stability and precision tuning, essential for maintaining clear and consistent signal transmission. It incorporates a high-resolution LCD display, offering easy readability of frequency information and operational settings. Additionally, the transceiver supports a range of modulation modes, including FM, SSB, and CW, making it versatile for various communication needs.

In terms of receiver performance, the IC-820H boasts a high dynamic range and excellent sensitivity, enabling it to capture weak signals effectively while minimizing interference. The transceiver is designed with high-quality RF and IF filtering, which enhances signal clarity and reduces noise. It also features a comprehensive scanning function, allowing users to efficiently search for active frequencies and monitor multiple channels.

The IC-820H is built with user-friendly controls and an intuitive interface, making it accessible for both novice and experienced operators. Its robust construction ensures durability, while the compact design makes it suitable for both stationary and mobile setups. The transceiver also includes provisions for optional accessories, enhancing its functionality and adaptability to various operating conditions.

Icom IC-820H Transceiver F.A.Q.

How do I perform a factory reset on the Icom IC-820H?

To perform a factory reset on the Icom IC-820H, turn off the transceiver, then press and hold the 'FUNC' button while turning the power back on. This will reset the transceiver to its original factory settings.

What is the recommended procedure for cleaning the Icom IC-820H transceiver?

Use a soft, dry cloth to gently wipe the exterior surfaces of the IC-820H. Avoid using any solvents or harsh chemicals, as these can damage the finish or internal components.

How can I troubleshoot no audio output on my IC-820H?

First, check the volume and squelch settings. Ensure the speaker is connected properly. If using an external speaker, verify it's functioning. If the problem persists, inspect the audio circuitry for faults.

What are the steps to update the firmware on the Icom IC-820H?

The IC-820H does not support firmware updates as it is an older model. Ensure all settings are correct and consult the user manual for optimal operation.

How to adjust the transmit power on the IC-820H?

To adjust the transmit power, use the 'RF Power' control on the front panel. Rotate the knob to increase or decrease the power output as needed for your communication requirements.

Why is my IC-820H not turning on and how can I fix it?

Check the power cable connections and ensure the power supply is working. Verify the fuse is intact. If the problem continues, the internal power circuitry may need professional servicing.

What is the procedure for tuning the antennas on the IC-820H?

Use the built-in SWR meter to monitor the standing wave ratio while transmitting. Adjust the antenna length or position for the lowest SWR reading to ensure optimal performance.

How can I set up the IC-820H for satellite communication?

Configure the frequency settings to match the satellite's uplink and downlink frequencies. Use the 'FUNC' and 'MEMORY' buttons to store these settings for quick access during satellite passes.

What regular maintenance does the IC-820H require?

Regularly check all cable connections and clean the unit to prevent dust buildup. Inspect the antenna connections and ensure the power supply is stable. Periodically verify the functionality of all controls and switches.

How can I improve the reception quality on my IC-820H?

Ensure the antenna is properly tuned and positioned. Use a preamplifier if necessary, and minimize local interference by relocating the transceiver or using shielding techniques.