1. Introduction
This manual provides comprehensive instructions for the operation and maintenance of your Generic SI4732 Mini Radio Receiver. Please read this manual thoroughly before using the device to ensure proper function and to maximize your listening experience. This portable radio is designed for receiving a wide range of radio frequencies, including AM, FM, LSB, USB, and shortwave bands.
2. Product Overview
2.1 Key Features
- Full-Band Radio Reception: Supports AM, FM, LSB, USB, and shortwave bands (0.5-108 MHz) with a SI4732 DSP chip for superior signal reception.
- High-Quality Color Display: Features a 1.9-inch IPS HD color screen (170*320 resolution) for clear display of station details and settings.
- Long-Lasting Rechargeable Battery: Equipped with a built-in 800mAh battery, providing over 10 hours of continuous operation on a single charge.
- Portable and Compact Design: Compact pocket-sized design with a durable 3D-printed PETG case, ideal for indoor and outdoor use.
- Enhanced Reception: Includes a portable loop antenna covering 9.9 kHz to 108 MHz for improved signal reception.
- Versatile Connectivity: Features a Type-C charging port and a 3.5mm headphone jack for private listening.
2.2 Package Contents
Upon unpacking, please verify that all items listed below are present:
- SI4732 Mini Radio Receiver Host (1 unit)
- External Antenna (1 unit)
- USB Charging Cable (1 unit)
Image 2.2.1: The SI4732 Mini Radio Receiver, showing the main unit, external telescopic antenna, and USB charging cable.
3. Setup
3.1 Initial Charging
Before first use, fully charge the radio's internal 800mAh battery. Connect the provided USB charging cable to the Type-C port on the radio and to a standard USB power source (e.g., computer USB port, USB wall adapter). The charging indicator on the screen will show the charging status. Note that fast charging is not supported.
3.2 Antenna Connection
For optimal reception, connect the external antenna to the SMA connector on the top of the radio. Ensure the connection is secure. The radio also features a built-in loop antenna for certain frequency bands.
Image 3.2.1: The radio with its telescopic antenna extended, ready for use.
Image 3.2.2: The radio connected to the external loop antenna, which enhances reception across various bands.
4. Operating Instructions
4.1 Power On/Off
Locate the power button, typically on the side or front panel. Press and hold the button for a few seconds to power the device on or off. The IPS display will illuminate upon power-on.
4.2 Band Selection
The radio supports multiple frequency bands: AM, FM, LSB, USB, and Shortwave (HF SW MW VHF). Use the navigation controls (buttons or rotary encoder, depending on model variant) to cycle through available bands. The currently selected band will be displayed on the 1.9-inch IPS screen.
4.3 Tuning
Use the rotary encoder (tuning knob) to adjust the frequency. Turning the knob clockwise increases the frequency, while turning it counter-clockwise decreases it. The step size for tuning can often be adjusted through the radio's menu settings for fine or coarse tuning.
Image 4.3.1: The radio displaying its frequency and mode on the IPS screen, with the tuning knob visible.
4.4 Volume Control
Adjust the audio output level using the dedicated volume control, which may be integrated with the tuning knob or a separate button/dial.
4.5 Headphone Use
For private listening, connect standard 3.5mm stereo headphones to the audio interface port. The internal speaker will typically mute automatically when headphones are connected.
Image 4.5.1: Close-up views showing the Type-C charging port, 3.5mm audio jack, SMA antenna connector, and rotary encoder.
5. Maintenance
5.1 Cleaning
Wipe the radio's 3D-printed PETG housing with a soft, dry cloth. Avoid using abrasive cleaners, solvents, or harsh chemicals, as these can damage the surface or internal components.
5.2 Battery Care
To prolong battery life, avoid fully discharging the battery frequently. Recharge the radio when the battery indicator is low. If storing the radio for an extended period, charge it to approximately 50% and recharge every few months.
5.3 Storage
Store the radio in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity. Keep it away from strong magnetic fields.
6. Troubleshooting
- No Power: Ensure the battery is charged. Connect the radio to a power source using the USB Type-C cable and attempt to power on.
- Poor Reception: Extend the telescopic antenna fully or connect the external loop antenna. Try repositioning the radio or antenna. Check for local interference from electronic devices.
- No Sound: Check the volume level. Ensure headphones are not connected if you intend to use the internal speaker. If headphones are connected, ensure they are fully inserted and functional.
- Screen Not Responding: Try restarting the device by holding the power button. If the issue persists, ensure the battery is charged.
7. Specifications
| Main Controller | ESP-32-S3 |
| Receiving Frequency Band | 0.5-108 MHz (HF SW MW VHF, AM, FM, LSB, USB) |
| Screen | 1.9-inch IPS Color Display, 170*320 resolution |
| Charging Port | USB Type-C (does not support fast charging) |
| Audio Interface | 3.5mm Tri-band Stereo Jack |
| Battery Capacity | 800mAh |
| Weight | Approximately 150g |
| Housing Material | 3D-printed PETG |
Image 7.1.1: Product dimensions and specifications for the radio and wideband receiving antenna.
8. Warranty and Support
Warranty and support information for this Generic SI4732 Mini Radio Receiver is not provided in the product data. Please refer to the retailer or point of purchase for details regarding warranty coverage and customer support options.
