ISC-11 // Satellite Communications Engineering

Indonesia Rain Fade / Link Margin Calculator

Rain attenuation for a satellite link, using ITU-R P.618-13 (attenuation prediction), P.838-3 (specific attenuation coefficients), and P.839-4 (rain height) — with rainfall statistics pre-loaded for a set of Indonesian cities from the official ITU-R P.837-7 digital maps, or entered manually for any other site.

Site & link parameters

Location

Latitude (°, + N / − S)

Rain rate R_0.01 (mm/h)

Rain height h_R (km, above MSL)

Station height h_s (km, above MSL)

Frequency (GHz)

Elevation angle (°)

Polarization

Availability target

Result

—dB

Rain attenuation at selected availability

Attenuation vs. availability

Availability	Time exceeded (p, %)	Predicted attenuation (dB)

Model chain: specific attenuation coefficients from ITU-R P.838-3 (verified against the ITU's own published validation test case); rain height from ITU-R P.839-4; full attenuation prediction procedure from ITU-R P.618-13 §2.2.1.1. Reference R_0.01 and rain-height values for the preset cities were computed directly from the official ITU-R P.837-7 / P.839-4 digital maps (0.125° grid) — not estimated. For any other location, enter R_0.01 and rain height manually (measured local data, where available, is always preferable to a model estimate — Indonesian field measurements in the literature have shown model-vs-measured differences of 20–30% at some sites). This model is valid for elevation angles ≥ 5° and frequencies up to ~55 GHz; it estimates long-term statistical attenuation, not a specific storm event.