// multi-utility computation suite · offline · instant · precise
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sci.link-budget-EIRP Calculator
Calculates satellite or wireless link budget from EIRP, path loss, receiver noise figure, and required Eb/N₀ to determine link margin. A geostationary satellite at 36,000 km has free-space path loss of 200 dB at 10 GHz — a 1 m dish with G = 40 dBi provides a 40 dB offset, requiring EIRP > 120 dBW for marginal link.
Inputs
P Tx Dbm
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
G Tx Dbi
Reference formula or conversion factor shown for context.
L Cable Db
Reference formula or conversion factor shown for context.
Fspl Db
Reference formula or conversion factor shown for context.
G Rx Dbi
Reference formula or conversion factor shown for context.
Nf Db
Reference formula or conversion factor shown for context.
B Mhz
Horizontal extent perpendicular to the length.
Results
EIRP (dBm)
Reference formula or conversion factor shown for context.
received power P_rx (dBm)
Reference formula or conversion factor shown for context.
noise floor (dBm)
Random or irrelevant variation in the measurement.
link SNR (dB)
Sample size or count used in the calculation.
EIRP = P_tx + G_tx − L_cable
Reference formula or conversion factor shown for context.