• SubGHz
  • Beginner
  • 3 min
  • Serial CLI

Recipe · Beginner · SubGHz

How to sweep SubGHz activity

Use CC1101 SubGHz sweep to find active frequency areas before receiving or decoding frames.

CC1101 sub-GHz radio signal workflow.
Start with read-only checks, then move to write, replay or automation only when the setup is understood.
Step 1

Commands

Use the shortest command path that matches the documented firmware workflow. When a mode needs setup, follow the prompts shown on first entry.

Result

What it means

The command path is working when the target responds and the firmware prints the expected menu, status or captured data.

Troubleshooting

  • Re-enter the mode setup when pins or peripherals are not already initialized.
  • Check common ground and target voltage before blaming software.
  • Prefer Serial CLI for long captures or high-volume output.
  • Repeat the read or capture to confirm stability.

Next steps

  • Save the output in your project notes.
  • Compare the result with the full wiki page for mode-specific details.
  • Create a shorter alias if you repeat this workflow often.

Sub-GHz sweep FAQ

What does a sweep actually measure?

A sweep measures received signal strength across a frequency range. It helps locate active areas, but it does not identify the protocol, modulation or payload by itself.

What is sweep good for before receive?

Sweep helps locate active frequency areas before you commit to a narrower receive, record or decode workflow. It is a spectrum-navigation step rather than a frame parser.

How should I choose the next step after a sweep?

Pick a repeatable peak in an authorized band, fine-tune around it, then use receive or trace on a signal you own or are allowed to analyze. Avoid replay or transmit steps until the setup is understood.

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