Fresnel Zone v1.0.0

Calculate the Fresnel zone radius at the midpoint of a radio link. Given frequency in MHz, link distance in kilometres, and zone number (1-5), returns the Fresnel zone radius in metres and feet, plus the 60% clearance threshold used in practical link engineering. The first Fresnel zone defines the region where most RF energy travels; obstructions within 60% of this radius cause significant signal degradation. Feeds into link_budget for path clearance analysis.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/fresnel_zone \
  -H "Content-Type: application/json" \
  -d '{"freq_mhz": …, "dist_km": …, "zone_number": …}'

MCP: connect to https://calc.engineer/mcp and call fresnel_zone.