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THE FEUTEX TOOLKIT

First Fresnel Zone Clearance

Estimate Fresnel radius at an obstruction and its fractional clearance.

Communications workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
Formular1=√(λd1d2/(d1+d2))
Sources and model references

Worked example

Inputs

Carrier
1000000000 Hz
Distance from first antenna
1000 m
Distance from second antenna
1000 m
Actual clearance
10 m

Expected results

First-zone radius
12.24321155 m
Clearance fraction
0.8167791564 ratio

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "f": 1000000000,
  "d1": 1000,
  "d2": 1000,
  "clear": 10
}

Accuracy and scope

Paraxial first-zone geometry; no terrain curvature, refraction or diffraction-loss prediction. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.