rf

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.

post/api/fresnel_zone

Request

  • Base URL: https://calc.engineer
  • URL: https://calc.engineer/api/fresnel_zone
  • Auth: none declared

Request body

freq_mhznumber required

Operating frequency in megahertz (MHz)

dist_kmnumber required

Total link distance in kilometres

zone_numbernumber

Fresnel zone number (1-5, default 1)

Response

Computed result for fresnel_zone

toolstring required
versionstring required
computed_atstring date-time required

Changes

No recorded changes to this operation across all 1 revision of this API.