SDRLAB Quickstart — Your First 30 Minutes
Learning goal: by the end of this page you will have picked a product, understood the general "plug in → driver → software → signal" flow, and verified that your SDR hardware actually works. Audience: first-timers ｜ Prerequisites: one SDRLAB product, a computer (Windows/Linux/macOS), and the will to hear radio noise and love it.
Concept: the universal SDR flow
Every SDRLAB product follows the same three-stage journey, even though the details differ:
Think of it like plugging in a new game controller: hardware first (the thing must be recognized), driver second (the OS must talk to it), software third (the game — actually the radio — must know how to use it). Nine times out of ten, "nothing works" means one of these three stages was skipped.
Step 1: Pick your product and connect it
| Product | How it connects | Needs extra power? | First step |
|---|---|---|---|
| RTL-SDR Blog V4 | USB-A to your PC | No (USB powered) | Plug in, install driver |
| SDRLab TRX-duo | Gigabit Ethernet + USB-C power | Yes, power via USB-C | Flash SD card, boot, browse to web UI |
| SDRLab H4M | Standalone handheld (USB-C for charging/flashing) | Battery or USB-C | Charge, insert microSD, install Mayhem firmware |
| 5G Expansion Board | Flipper Zero GPIO header | No (Flipper/battery) | Set GPIO pins, open Marauder app |
| NRF24 module | Flipper Zero GPIO header | No | Plug in, open NRF24 sniffer app |
| WiFi multiboard | Flipper Zero GPIO header | No | Plug in, open WiFi deauther app |
| Ethernet test module | Flipper Zero GPIO header + RJ45 cable | No | Wire SPI, open Ethernet app |
New to Flipper Zero? Head to the Flipper Zero section first to get your Flipper updated and comfortable.
Step 2: Make the driver/firmware layer happy
- RTL-SDR V4 on Linux: you need a current driver — older distro packages don't know about the V4's R828D tuner. Follow the driver update steps on the RTL-SDR V4 page.
- RTL-SDR V4 on Windows: modern tools (SDR#, SDR++, SDR Console) ship with V4-compatible drivers — just install the software and go.
- TRX-duo: the SD card is the firmware. Download the official image (see the TRX-duo page), write it to a microSD card, insert, boot.
- H4M: install the Mayhem firmware — the device ships functional but Mayhem unlocks the full toolkit.
- Flipper modules: most need a custom Flipper firmware (Momentum, Unleashed, Xtreme) for the extra apps, plus a GPIO pin setting. Each expansion page lists the exact pins.
Step 3: Launch software and verify a signal
The fastest "it works!" test per device:
| Product | Test | Expected result |
|---|---|---|
| RTL-SDR V4 | rtl_test in terminal | "Supported sample rates", PASS lines scrolling |
| TRX-duo | Browser → http://192.168.1.100 | Red Pitaya-style web dashboard loads |
| H4M | Spectrum app on screen | Waterfall shows FM broadcast band noise/signals |
| 5G board | Marauder scanap | Nearby SSIDs appear with RSSI |
| NRF24 module | Channel scanner | 2.4 GHz activity on channels 1–126 |
| WiFi multiboard | Deauther scan | AP list populates |
| Ethernet module | W5500 app → DHCP | IP address assigned, ping works |
Step 4: Tune something real
Pick a frequency you know has signals, not a random spot:
- FM broadcast radio: 88–108 MHz — your first SDR signal, guaranteed.
- NOAA weather satellites (137 MHz): APT satellite images, a weekend project favorite.
- Aircraft (ADS-B, 1090 MHz): planes streaming position data.
- Pager (POCSAG): ~137 MHz and ~466 MHz — classic RTL-SDR curiosity.
- Aircraft (HF, if you own a TRX-duo): 3–30 MHz shortwave broadcasters at night.
Step 5: Check your checklist
- Hardware recognized (led light on / app sees the device)
- Driver or firmware version is current
- SDR software sees the device by name/model
- Waterfall or spectrum shows something — then a real signal
- Know where your antenna is and what band it suits (this matters more than you think!)
Common first-day mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
No devices found in rtl_test | Kernel DVB driver grabbed the dongle | Blacklist dvb_usb_rtl28xxu (see RTL-SDR V4 page) |
| TRX-duo web UI unreachable | Wrong static IP / no DHCP on the network | Check the network section |
| H4M has no apps | microSD missing or stale | Copy the COPY_TO_SDCARD files from the Mayhem release |
| Flipper app says "no module" | GPIO pins not set for the module | Set pins under Protocol Settings → GPIO Pin Settings (per expansion page) |
| Everything dead | No antenna attached | Screw on the antenna — an SDR without an antenna is a very quiet paperweight |
Next steps
- Ready to go deeper? The SDR software guide explains the tools; the firmware guide covers updates.
- Stuck on something specific? The troubleshooting hub is organized by symptom.
- Pairing an ALFA Wi-Fi adapter with your SDR work? See the ALFA Linux guide.
Legal & Responsible Operation Notice
⚠️ Compliance Notice: Radio frequency transmission and signal capture are governed by telecommunications and cybersecurity regulations (including Taiwan Criminal Code Articles 358–363 on offenses against computer security). Only operate SDR transmitters and packet analyzers on frequencies and systems that you own or have explicit written authorization to evaluate.