Icom IC-1275A Instruction Manual

Pages 32

Year 1989

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Icom IC-1275A Transceiver Specification

The Icom IC-1275A is a robust VHF transceiver designed specifically for amateur radio enthusiasts seeking reliable performance and advanced features. Operating on the 2-meter band, this transceiver provides an output power of 10 watts, which is adjustable to suit varying communication needs. It features a high-stability frequency synthesizer, ensuring precise frequency control with a tuning resolution of 10 Hz. The IC-1275A supports a frequency range from 144 to 148 MHz, covering the entire 2-meter amateur band.

This transceiver is equipped with a built-in digital phase-locked loop (PLL) circuit that enhances frequency stability and reduces signal drift. The IC-1275A includes a large, easy-to-read LCD display that shows frequency, mode, and other essential operating information. It supports both SSB and CW modes, providing versatility for different communication preferences. The receiver section boasts a superior sensitivity of 0.14 μV for 12 dB SINAD, ensuring clear reception even in weak signal conditions.

Additional features include a noise blanker and automatic gain control (AGC) for improved signal clarity and reduced interference. The IC-1275A is designed with a rugged chassis and user-friendly interface, making it suitable for both mobile and base station setups. It provides comprehensive connectivity options, including microphone, keyer, and external speaker ports, allowing for seamless integration with existing radio equipment. The Icom IC-1275A stands out for its combination of performance, reliability, and ease of use, making it a preferred choice for amateur radio operators seeking a high-quality VHF transceiver.

Icom IC-1275A Transceiver F.A.Q.

How do I perform a factory reset on the Icom IC-1275A?

To perform a factory reset on the Icom IC-1275A, turn off the transceiver. Then hold down the [FUNC] and [VFO/MR] buttons together while turning the power back on. This will reset the transceiver to its default settings.

What is the proper procedure for tuning the antenna on the IC-1275A?

To tune the antenna on the IC-1275A, connect an SWR meter between the transceiver and the antenna. Transmit a signal on your desired frequency and adjust the antenna for the lowest SWR reading.

How can I resolve audio distortion issues when transmitting?

Check the microphone gain settings by accessing the menu and adjusting it to a lower level. Also ensure that the microphone is not too close to your mouth and that the speech compressor is set appropriately.

What maintenance is recommended for the Icom IC-1275A?

Regular maintenance includes checking and cleaning all external connections, periodic inspection of the power supply, and ensuring that the cooling vents are free from dust. It's also advisable to perform a basic operational check periodically.

How can I improve the receiver sensitivity of my IC-1275A?

Ensure that your antenna is properly tuned and positioned. Using a preamplifier can also help improve reception. Additionally, check that all connections are secure and free from corrosion.

What should I do if my IC-1275A will not power on?

First, check the power cable connections and ensure that the power supply is providing the correct voltage. Inspect the fuses and replace them if necessary. If the problem persists, consult the service manual or contact Icom support.

How do I store frequency settings in memory on the IC-1275A?

To store a frequency in memory, tune to the desired frequency, press the [MEMORY] button, then select a memory channel using the tuning knob and press [MEMORY] again to save.

What are common causes of overheating in the IC-1275A, and how can I prevent it?

Common causes include blocking of ventilation slots and excessive transmission at high power without breaks. Ensure proper airflow by keeping vents clear and consider using an external fan for added cooling.

How can I update the firmware on my Icom IC-1275A?

As the IC-1275A is an older model, it does not support firmware updates. Ensure your device is functioning correctly with regular maintenance and use compatible accessories.

What troubleshooting steps should I take if the IC-1275A cannot transmit?

First, verify that the transceiver is in the correct mode and frequency. Check the microphone connection and ensure the PTT button is functioning. Also, inspect the antenna and SWR to confirm they are operating within normal parameters.