FieldengRF, Radio & Wireless
Free-Space Path Loss
Theoretical free-space path loss. Not a prediction of field performance.
RF, Radio & WirelessNetworking & Communications
Theoretical free-space path loss. Not a prediction of field performance.
App id: RF-05. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
FSPL = 20 log10(4πd / λ), λ = c / fInputs
| Name | Unit |
|---|---|
| Frequency | MHz |
| Distance | km |
Outputs
| Name | Unit |
|---|---|
| Path loss (hero result) | dB |
| Wavelength | m |
Diagnose
This tool does not attach diagnose observations.
Assumptions
- Free-space propagation only.
- No terrain, obstruction, rain, multipath, or polarization loss.
Provenance
- FSPL = 20 log10(4πd / λ) with SI d and λ. Wavelength from FUND-01.