// multi-utility computation suite · offline · instant · precise
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hobby.radio-frequency Calculator
Calculates free-space path loss, received signal power, and antenna gain requirements for a radio link at a given frequency and distance. Used by amateur radio operators and RF engineers to determine whether a link is feasible at a given power level.
Inputs
Freq Mhz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Power W
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Antenna Gain
Reference formula or conversion factor shown for context.
Distance Km
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Results
EIRP (dBW)
Reference formula or conversion factor shown for context.
free-space path loss (dB)
The decrease or degradation from the baseline.
received signal (dBW)
The meaningful information component, separated from noise.
wavelength (m)
The computed linear length.
quarter-wave antenna (cm)
Sample size or count used in the calculation.
half-wave dipole (cm)
Reference formula or conversion factor shown for context.