RTL-SDR Spectrum Analyser Kit for Raspberry Pi 4 - Build a Real-Time Display
Build a Real-Time SDR Spectrum Analyser with Raspberry Pi 4 and RTL-SDR
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Transform a Raspberry Pi 4 into a full-fledged RF spectrum analyser covering 24 MHz to 1.7 GHz. Watch live FFT and waterfall displays as you decode FM signals, track Wi-Fi activity, or investigate unknown transmissions - all with real-time plotting via GNU Radio. It's the perfect bridge between theoretical DSP coursework and practical wireless research.
What You'll Build
You'll assemble a portable, software-defined spectrum analyser that scans from HF to UHF bands. Connect the wideband antenna, boot the pre-configured OS on the MicroSD card, and immediately see the electromagnetic spectrum in vivid colour. Once running, you can save I/Q recordings, export measurement data, or script custom signal-processing blocks for your research or college project.
What You'll Learn
- Install and configure GNU Radio on Raspberry Pi OS
- Capture and stream raw I/Q samples from an RTL-SDR dongle
- Design custom FFT and waterfall sinks using GNU Radio Companion
- Analyse wireless protocols like FM, DVB-T, GSM, and LoRa in real time
Kit Contents
| Component | Quantity |
|---|---|
| Raspberry Pi 4 Model B 4GB | x1 |
| RTL-SDR Dongle | x1 |
| Wideband Antenna | x1 |
| MicroSD Card 32GB | x1 |
| USB-C PSU | x1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This advanced kit is designed for B.Tech ECE/EEE students working on final-year communication projects, Smart India Hackathon teams prototyping RF solutions, and research scholars at IIT/NIT/VIT/BITS exploring software-defined radio. It also suits ATL lab mentors guiding advanced tinkering and electronics hobbyists ready to move beyond microcontroller projects.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project - accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
The AI companion covers every step, from flashing the SD card to tuning the FFT waterfall. If you need a human, our WhatsApp support team is available during IST working hours.
Can I use this kit to analyse GSM or 4G signals?
Yes, within the 24 MHz-1.7 GHz range you can capture GSM, FM, DVB-T, and some LTE bands. Full protocol decoding may require extra software libraries, but the kit gives you the raw I/Q data and real-time visualisation needed for research.
Do I need a monitor or can I use it headless?
You can operate headlessly via VNC or SSH from a laptop, or connect an HDMI display for direct interaction. The pre-configured OS runs GNU Radio with a full graphical interface either way.
Is the RTL-SDR dongle sensitive enough for weak signals?
The included dongle uses an RTL2832U chipset with up to 2.4 MSPS sample rate and sensitivity around -60 dBm, sufficient for strong local signals and lab demonstrations. Adding an external LNA can extend it for faint signal work.
RTL-SDR + GNU Radio on Pi 4 builds a real-time spectrum analyser from 24MHz to 1.7GHz - waterfall and FFT display.
What's in this kit
- Raspberry Pi 4 Model B 4GB
- RTL-SDR Dongle
- Wideband Antenna
- MicroSD Card 32GB
- USB-C PSU
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items