Icom IC-735 Instruction Manual

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Icom IC-735 Receiver Specification

The Icom IC-735 is a versatile HF transceiver renowned for its robust performance and compact design. It operates across multiple bands, including 160 through 10 meters, covering all amateur HF bands. The receiver architecture employs a double conversion superheterodyne system, ensuring excellent sensitivity and selectivity. Its frequency range is from 0.1 to 30 MHz, with a general coverage receiver capability, allowing users to explore a wide range of frequencies beyond amateur bands.

The IC-735 features a digital readout with a frequency display resolution of 10 Hz, which provides precise frequency control and easy tuning. It also includes a built-in digital display for signal strength, offering immediate visual feedback on signal conditions. The receiver's dynamic range is enhanced by its advanced RF preamp and attenuator, which help manage strong signals and reduce potential interference.

A distinctive feature of the IC-735 is its PLL (Phase Locked Loop) synthesized local oscillator, which delivers stable and accurate frequency control. The transceiver supports various modes, including SSB, CW, AM, and FM, catering to diverse communication needs. It employs a 100 kHz crystal calibrator for frequency accuracy, ensuring reliable operation across different modes.

The IC-735's compact form factor does not compromise its durability, as it is built with high-quality components and a solid chassis, making it suitable for both fixed and portable operations. Its user-friendly interface includes intuitive controls and a clear display, facilitating ease of use for operators of all experience levels. The Icom IC-735 is a well-rounded receiver that combines reliability, functionality, and ease of operation, making it a popular choice among amateur radio enthusiasts.

Icom IC-735 Receiver F.A.Q.

How do I perform a factory reset on the Icom IC-735?

To perform a factory reset on the Icom IC-735, turn off the radio, hold down the 'CLEAR' button, and turn the radio back on while holding the button. This will reset the radio to its default settings.

What is the best way to clean and maintain the exterior of the IC-735?

Use a soft, dry cloth to clean the exterior of the IC-735. Avoid using harsh chemicals or abrasive materials, as these can damage the finish. For stubborn stains, a slightly damp cloth can be used, but ensure the radio is turned off and unplugged.

Why is my IC-735 not receiving any signals?

Check the antenna connections and ensure the antenna is properly tuned and connected. Also, verify that the squelch is not set too high, which can prevent weak signals from being heard.

How can I improve the audio quality on my IC-735?

Improving audio quality can often be achieved by adjusting the RF gain and AF gain controls. Also, consider using an external speaker for better sound clarity. Ensure that all connections are secure and free from corrosion.

What should I do if the IC-735 display is not working?

If the display is not working, check the power connections and ensure the radio is receiving adequate power. Inspect the internal fuses and replace any that are blown. If the issue persists, it may require service by a qualified technician.

How do I adjust the transmit power on the IC-735?

To adjust the transmit power, use the RF power control knob located on the front panel. Rotate the knob to increase or decrease the power output according to your needs.

Can I use the IC-735 with a linear amplifier?

Yes, the IC-735 can be used with a linear amplifier. Ensure that the amplifier is compatible with the IC-735's output and that all connections are secure. Follow the amplifier's manual for proper setup instructions.

How do I set the frequency on the IC-735?

To set the frequency, use the VFO knob to tune to the desired frequency. You can also use the keypad for direct frequency entry by pressing the 'F-INP' button followed by the frequency digits.

What should I do if the IC-735 is overheating?

Ensure that the radio is in a well-ventilated area and that the cooling fan, if present, is functioning properly. Avoid placing the radio in direct sunlight or near heat sources. If overheating persists, reduce the transmit power or duty cycle.

How do I update the firmware on the IC-735?

The Icom IC-735 does not support firmware updates as it is an older model. Ensure that all operational checks and alignments are performed according to the service manual for optimal performance.