SPACE TECH & AVIONICS
Satellite Link Budget Calculator
Estimate free-space path loss, received carrier power and link margin for a satellite or terrestrial microwave path.
Engineering screening tool. Verify mission, manufacturer, operator, regulatory and project-specific requirements before relying on the result.
Free-space path loss205.63 dB
Estimated received power-84.63 dBm
Link margin30.37 dB
Formula: FSPL = 92.45 + 20 log10(f_GHz) + 20 log10(d_km); Pr = Pt + Gt + Gr - FSPL - losses.
Method and assumptions
FSPL = 92.45 + 20 log10(f_GHz) + 20 log10(d_km); Pr = Pt + Gt + Gr - FSPL - losses.
Important limitations
- Screening calculation only. It does not model rain fade, polarization mismatch, atmospheric gases, interference, implementation loss or regulatory coordination unless you include them in total losses.
- Use the receiver threshold or required carrier level from the actual modem/terminal data sheet.
Technical references
Commercial independence
Any sponsored or affiliate option shown after the calculation is separate from the formula and result. PROFENG does not change assumptions, outputs or ranking of engineering results because of a commercial relationship.