SI4732 9.9kHz-108MHz DSP Radio Receiver for RF Signal Monitoring

Mini SI4732 DSP Radio Receiver

A compact, receive-only DSP radio based on an ESP32-S3 controller and SI4732 receiver IC. It provides an accessible portable platform for broadcast-band listening, RF learning, and receiver experimentation; it does not transmit.

Receiver Features

• Controller: ESP32-S3 with SI4732 DSP receiver.
• Receive modes: LSB, USB, AM and FM.
• Listed coverage: 0.5–108 MHz for HF, SW, MW and VHF reception; tuneable coverage and reception quality depend on mode, antenna, and local conditions.
• Display: 1.9-inch IPS color display, 170 × 320 pixels.
• Audio: built-in speaker and 3.5 mm audio output.

Power and Enclosure

• Built-in 800 mAh battery; the source lists approximately 10 hours or more of operating time depending on use.
• USB Type-C charging input; use a standard 5 V USB supply rather than a fast-charging-only source.
• PETG 3D-printed enclosure, approximately 73 × 32 × 12 mm.

Choose the Antenna Bundle

• With one antenna: receiver, one selected antenna, and USB cable.
• With two antenna: receiver, two included antenna accessories, and USB cable.
• Extend or position the antenna away from noise sources for better reception; a larger external antenna may be appropriate for a stationary setup.

Use Notes

• This is a receiver for lawful listening and bench experimentation. It does not add transmission capability.
• Reception at lower frequencies is highly dependent on antenna type, location, interference, and time of day.
• Check the selected antenna bundle before checkout, since the receiver body is the same but accessories differ.