mcnanovna

MCP server for controlling NanoVNA-H vector network analyzers over USB serial.

Provides 78 tools for frequency sweeps, S-parameter measurements, calibration, LCD capture, RF analysis, 3D antenna radiation pattern visualization, and pattern import from external files.

Installation

# From PyPI (when published)
uvx mcnanovna

# From source
uv run mcnanovna

# With optional web UI for 3D pattern visualization
uv sync --extra webui
MCNANOVNA_WEB_PORT=8080 uv run mcnanovna

Quick Start

Just plug in your NanoVNA-H and start the server. The device auto-connects on first tool call.

# Add to Claude Code
claude mcp add mcnanovna -- uvx mcnanovna

Then ask Claude to scan your antenna, analyze a filter, or measure a crystal.

Tools

Measurement

info, sweep, scan, data, frequencies, marker, cal, save, recall, pause, resume

Configuration

power, bandwidth, edelay, s21offset, vbat, capture, measure, config, saveconfig, clearconfig, color, freq, tcxo, vbat_offset, threshold

Display

trace, transform, smooth, touchcal, touchtest, refresh, touch, release

Device

reset, version, detect, disconnect, raw_command, cw, sd_list, sd_read, sd_delete, time

Diagnostics

i2c, si, lcd, threads, stat, sample, test, gain, dump, port, offset, dac, usart_cfg, usart, band

Analysis

analyze, export_touchstone, export_csv, analyze_filter, analyze_xtal, analyze_tdr, analyze_component, analyze_lc_series, analyze_lc_shunt, analyze_lc_match, analyze_s11_resonance

Radiation Patterns

radiation_pattern, radiation_pattern_from_data, radiation_pattern_multi

Pattern Import

import_pattern_csv, import_pattern_emcar, import_pattern_nec2, import_pattern_s1p, list_pattern_formats

Prompts

Prompt	Description
calibrate	SOLT calibration walkthrough
export_touchstone	S-parameter export to .s1p/.s2p
analyze_antenna	SWR, impedance, bandwidth analysis
measure_cable	TDR and cable characterization
analyze_crystal	Crystal motional parameter extraction
analyze_filter_response	Filter type classification and cutoffs
measure_tdr	Time domain reflectometry
compare_sweeps	Before/after comparison
measure_component	Unknown L/C/R identification
measure_lc_series	Series LC resonator measurement
measure_lc_shunt	Shunt LC resonator measurement
impedance_match	L-network matching design
visualize_radiation_pattern	3D pattern from S11 scan
import_pattern	Load patterns from CSV/EMCAR/NEC2/S1P
measure_antenna_range	Automated 3D pattern with positioner

Web UI

Enable the optional 3D radiation pattern viewer:

uv sync --extra webui
MCNANOVNA_WEB_PORT=8080 uv run mcnanovna

Open http://localhost:8080 for an interactive Three.js visualization of antenna patterns.

Antenna Positioner Integration

For automated 3D pattern measurement, use together with mcpositioner:

claude mcp add mcpositioner -- uvx mcpositioner
claude mcp add mcnanovna -- uvx mcnanovna

The measure_antenna_range prompt guides through the cross-server workflow.

Supported Hardware

• NanoVNA-H (original)
• NanoVNA-H4
• Other variants using the same USB serial protocol (VID 0x0483, PID 0x5740)

License

MIT