Icom IC-737A Instruction Manual

Pages 64

Year 1993

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Icom IC-737A Transceiver Specification

The Icom IC-737A is a high-performance HF transceiver designed for amateur radio enthusiasts seeking reliability and versatility. Operating across the HF bands from 160 to 10 meters, the IC-737A supports SSB, CW, AM, and FM modes, providing comprehensive coverage for diverse communication needs. The transceiver delivers a power output of 100 watts, ensuring robust signal transmission across various propagation conditions.

The IC-737A features a sophisticated digital signal processing (DSP) system that enhances audio clarity by reducing noise and interference. Its advanced IF shift and notch filter capabilities further refine signal reception, allowing users to isolate desired signals in crowded band conditions. The built-in automatic antenna tuner optimizes antenna performance, while the dual VFOs facilitate seamless frequency management and quick band switching.

The transceiver boasts an intuitive user interface with a large, easy-to-read LCD display and a well-organized front panel, enabling straightforward operation and quick access to essential functions. Memory storage for up to 99 channels allows for convenient recall of frequently used frequencies. The IC-737A also supports various external connections, including a microphone jack, headphone jack, and external speaker terminals, enhancing its versatility for different operating environments.

The Icom IC-737A is designed with durability and reliability in mind, featuring a rugged chassis that withstands the demands of both portable and fixed-station operations. Its compact form factor makes it an ideal choice for operators with limited space. Overall, the IC-737A combines advanced technology with user-friendly features, making it a popular choice for amateur radio operators seeking a dependable and versatile HF transceiver.

Icom IC-737A Transceiver F.A.Q.

How do I perform a factory reset on the Icom IC-737A?

To perform a factory reset on the Icom IC-737A, turn off the transceiver, then press and hold the 'CLEAR' button while turning the transceiver back on. Release the 'CLEAR' button once the display initializes.

What should I do if the transceiver does not turn on?

If the Icom IC-737A does not turn on, first check the power supply connections and ensure that the power cable is securely connected. Verify that the power supply is operational and delivering the correct voltage. If the issue persists, inspect the fuses in the transceiver and replace any that are blown.

How can I reduce RF feedback during transmission?

To reduce RF feedback during transmission, ensure that your antenna system is properly tuned and that all RF connectors are tight and properly shielded. Consider using a common-mode choke on the feed line and ensure your station grounding is adequate.

What is the correct procedure for adjusting the microphone gain?

To adjust the microphone gain on the Icom IC-737A, first ensure that the transceiver is set to the desired mode (SSB, AM, etc.). Use the microphone gain control located on the front panel, and adjust it while speaking into the microphone until the ALC meter indicates proper modulation levels without excessive peaking.

How do I program memory channels on the IC-737A?

To program memory channels, first select the desired frequency and mode. Press and hold the 'MW' (Memory Write) button until the memory channel number blinks. Use the 'UP' and 'DOWN' buttons to select the desired channel, then press 'MW' again to store the frequency.

What are the steps to align the internal tuner for optimal performance?

To align the internal tuner on the IC-737A, connect an SWR meter between the antenna and transceiver. Activate the tuner while transmitting a low power carrier. Adjust the antenna or tuner settings until the SWR meter indicates a low standing wave ratio, ideally below 1.5:1.

How can I troubleshoot intermittent audio output issues?

For intermittent audio output, check the speaker connections and ensure the external speaker jack is not causing a short. Verify that the AF gain control is not set too low. If the issue persists, inspect the internal speaker and audio circuitry for loose connections or components.

What should I do if the transceiver is experiencing frequency drift?

If the IC-737A experiences frequency drift, ensure the transceiver is adequately warmed up before operation. Check for any loose connections in the VFO system and verify that the power supply voltage is stable. If necessary, consult the service manual for oscillator alignment procedures.

How do I properly clean and maintain the IC-737A?

To clean the IC-737A, use a soft, dry cloth to wipe the exterior. Avoid using harsh chemicals or solvents. Ensure that all ventilation openings are clear of dust. Periodically check the connectors and tighten them if necessary. Store the transceiver in a dry environment when not in use.

How can I improve the receiver sensitivity on my IC-737A?

To improve receiver sensitivity, ensure that the antenna system is optimized and free from obstructions. Regularly check and clean all RF connectors. Consider using a preamplifier if necessary for weak signal areas. Align the RF and IF stages according to the service manual for optimal performance.