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THE FEUTEX TOOLKIT

Free-Space Radio Link Budget

Combine free-space attenuation, antenna gains and stated losses into received power.

Communications workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaPr=Pt+Gt+Gr−loss−20log10(4πdf/c)
Sources and model references

Worked example

Inputs

Carrier
1000000000 Hz
Path length
1000 m
Transmitter output
20 dBm
Transmit antenna gain
10 dBi
Receive antenna gain
10 dBi
Other losses
2 dB

Expected results

Free-space loss
92.44778322 dB
Received power
-54.44778322 dBm

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,
  "d": 1000,
  "pt": 20,
  "gt": 10,
  "gr": 10,
  "loss": 2
}

Accuracy and scope

Unobstructed far-field free space; no fading, weather or regulatory assessment. 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.