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Build Gnuradio Flowgraph by nitrojacob

Name: Build Gnuradio Flowgraph
Author: nitrojacob

Build Gnuradio Flowgraph

Compose and generate executable standalone GNU Radio Python top_block scripts (.py) or GRC block diagram files (.grc) using native GNU Radio DSP blocks, with built-in GRC schema and block presence validation.

nitrojacob 933607b 3 files · 8.6 KB Updated Sep 17, 2026

File contents

Build GNU Radio Flowgraph Skill 🛠️

Use this skill when you need to construct a complete, standalone GNU Radio Python flowgraph (gr.top_block) or .grc file to process, clean, synchronize, and demodulate a new or custom signal, or to validate GRC YAML schema and block presence.

Instructions

Execute Flowgraph Generator Tool:

PYTHONPATH=/usr/lib/python3/dist-packages:./ .agents/skills/build-gnuradio-flowgraph/scripts/build_gnuradio_flowgraph.py --input <input_sigmf_file> --output_script <output_script.py> --ops "dc_block,lowpass_filter,agc,costas_loop,symbol_sync"

In-Skill GRC Flowgraph Validation: When creating or editing .grc flowgraph files, validate the GRC YAML schema and enforce $0$ missing/dummy blocks directly via the skill validator:
```
PYTHONPATH=/usr/lib/python3/dist-packages:./ .agents/skills/build-gnuradio-flowgraph/scripts/build_gnuradio_flowgraph.py --validate_grc <path_to_grc_file>
```
Generated Python Top Block Architecture: The output script imports from gnuradio import gr, blocks, filter, analog, digital and wires native blocks into an executable pipeline:
- blocks.file_source $\rightarrow$ filter.dc_blocker_cc $\rightarrow$ filter.fir_filter_ccc $\rightarrow$ analog.agc2_cc $\rightarrow$ digital.costas_loop_cc $\rightarrow$ digital.symbol_sync_cc $\rightarrow$ blocks.file_sink.

Execute Generated Script: Run the generated GNU Radio top block script directly:

PYTHONPATH=/usr/lib/python3/dist-packages <output_script.py> <input_sigmf> <output_iq>

GRC Schema & RTL-SDR Hardware Reference: For detailed GRC 3.8/3.10 YAML schema rules, template block IDs, and RTL-SDR Linux hardware access setup, refer to references/grc_and_rtlsdr_guide.md.

---name: build-gnuradio-flowgraphdescription: Compose and generate executable standalone GNU Radio Python top_block scripts (.py) or GRC block diagram files (.grc) using native GNU Radio DSP blocks, with built-in GRC schema and block presence validation.---# Build GNU Radio Flowgraph Skill 🛠️Use this skill when you need to construct a complete, standalone GNU Radio Python flowgraph (`gr.top_block`) or `.grc` file to process, clean, synchronize, and demodulate a new or custom signal, or to validate GRC YAML schema and block presence.## Instructions1. **Execute Flowgraph Generator Tool**: ```bash PYTHONPATH=/usr/lib/python3/dist-packages:./ .agents/skills/build-gnuradio-flowgraph/scripts/build_gnuradio_flowgraph.py --input <input_sigmf_file> --output_script <output_script.py> --ops "dc_block,lowpass_filter,agc,costas_loop,symbol_sync" ```2. **In-Skill GRC Flowgraph Validation**: When creating or editing `.grc` flowgraph files, validate the GRC YAML schema and enforce $0$ missing/dummy blocks directly via the skill validator: ```bash PYTHONPATH=/usr/lib/python3/dist-packages:./ .agents/skills/build-gnuradio-flowgraph/scripts/build_gnuradio_flowgraph.py --validate_grc <path_to_grc_file> ```3. **Generated Python Top Block Architecture**: The output script imports `from gnuradio import gr, blocks, filter, analog, digital` and wires native blocks into an executable pipeline: - `blocks.file_source` $\rightarrow$ `filter.dc_blocker_cc` $\rightarrow$ `filter.fir_filter_ccc` $\rightarrow$ `analog.agc2_cc` $\rightarrow$ `digital.costas_loop_cc` $\rightarrow$ `digital.symbol_sync_cc` $\rightarrow$ `blocks.file_sink`.4. **Execute Generated Script**: Run the generated GNU Radio top block script directly: ```bash PYTHONPATH=/usr/lib/python3/dist-packages <output_script.py> <input_sigmf> <output_iq> ```5. **GRC Schema & RTL-SDR Hardware Reference**: For detailed GRC 3.8/3.10 YAML schema rules, template block IDs, and RTL-SDR Linux hardware access setup, refer to [references/grc_and_rtlsdr_guide.md](file:///.agents/skills/build-gnuradio-flowgraph/references/grc_and_rtlsdr_guide.md).

Frequently asked questions