ITU-R P.838 Specific Rain Attenuation Calculator

Use this endpoint when you need a standards-compliant implementation of the ITU-R P.838 specific rain attenuation model for link budget calculations in satellite, GEO, or fixed wireless microwave systems — especially when you need to evaluate attenuation across a range of rain rates or polarizations simultaneously. It is ideal for automating rain fade margin calculations in engineering workflows without maintaining your own ITU model implementation.

• Frequency outside 1–1000 GHz range returns validation error
• Elevation angle outside 0–90 degrees returns schema validation failure
• Polarization tilt outside -90 to 90 degrees returns rejection
• Rain rate values exceeding 500 mm/hr or array exceeding 32 items returns input error
• Missing required fields (frequency, elevation, polarization_tilt, rain_rates) returns 400 bad request
• Payment not included or insufficient USDC causes 402 Payment Required