Is this flight software?

No. SIDUS models are educational reimplementations. Cross-check before any flight decision.

Antenna beamwidth

Approximate half-power beamwidth θ ≈ k λ/D for parabolic dishes.

SIDUS educational calculator. Category satellite. Tags: comms, operations, RF, satellite. Pure SI. Not flight software.

θ ≈ k λ / D

Parabolic antenna HPBW

Space Mission Engineering: The New SMAD (Wertz, Everett, Puschell (eds.)): Mission engineering handbook: RF links, constellations, and ops framing.
Free-space path loss (Friis / ITU-style FSPL) (ITU / standard radio engineering): L_fs = 20 log10(d_km) + 20 log10(f_MHz) + 32.44 dB form used in educational link budgets.
AeroVia Aerospace Tools (AeroVia (public calculators)): Public catalog of ISA, dynamic pressure, launch azimuth, RF link, SSO-class tools (domain demand reference).

Read /llms.txt or call https://sidus.tools/api/mcp. Open the interactive page for live SI inputs.