Monitor a Spectrum Band

~110 minBeginner

Set up your first SDR receiver from hardware selection through to recording and analyzing real-world signals.

Prerequisites
Gather these before starting

Hardware

  • •RTL-SDR Blog V4 (recommended) or any supported SDR
  • •Antenna appropriate for target frequency
  • •USB cable + laptop or desktop PC
  • •Optional: low-noise amplifier (LNA) for weak signal work

Software / Knowledge

  • •Windows, Linux, or macOS computer
  • •Basic understanding of frequency (MHz/GHz)
  • •No programming knowledge required
  • •Internet connection for software downloads
Step 1 of 714% complete
Step 110 min
Choose Your SDR Hardware

Selecting the right hardware determines what frequencies you can receive, your dynamic range, and ultimately what signals you can decode. Here are the most common choices:

RTL-SDR Blog V4~$30

500 kHz – 1.75 GHz

Best for beginners. 8-bit ADC, ~3 MHz usable bandwidth. Ideal for FM, ADS-B, weather satellites.

HackRF One~$340

1 MHz – 6 GHz

TX + RX capable, half-duplex. 20 MHz bandwidth. Essential for radar experiments and signal generation.

Airspy Mini~$99

24 MHz – 1.8 GHz

12-bit ADC with exceptional dynamic range. Outstanding for crowded HF/VHF bands.

KiwiSDR~$299

0 – 30 MHz

HF specialist with built-in GPS for TDOA direction finding. Network-connected.

Key specs to compare

  • ADC bit depth: More bits = better dynamic range (ability to see weak signals beside strong ones)
  • Bandwidth: How wide a slice of spectrum you can capture simultaneously
  • Frequency range: Lower limit matters for HF; upper limit for microwave work
  • Noise figure: Lower is better — the RTL-SDR V4 uses a built-in LNA to help

For beginners, the RTL-SDR Blog V4 (~$30) is the best starting point — it covers 500 kHz to 1.75 GHz with excellent sensitivity.

Choose Your SDR Hardware