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Terrain · Fresnel clearance · free-space loss · dominant knife-edge diffraction

Path

Frequency (MHz)

Effective Earth k

Terrain samples

The initial diffraction calculation uses the dominant terrain knife edge. It is intentionally labelled approximate until a full multiple-edge/ITM model is added.

Sites

TX site

Latitude

Longitude

Antenna height AGL (m)

Antenna gain (dBi)

Ground AMSL: —

RX site

Latitude

Longitude

Antenna height AGL (m)

Antenna gain (dBi)

Ground AMSL: —

Place TX and RX on the map, then calculate.

Results

Distance

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Free-space loss

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Diffraction approx.

—

Basic propagation loss

—

Effective connector loss

—

LOS / Fresnel

—

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Terrain cross-section

No path calculated

Terrain + effective Earth curvature Direct TX–RX ray 60% first Fresnel zone