calc.engineer / RF & Antennas / Link Budget

Link Budget v1.0.0

Compute a full RF link budget from transmitter power, frequency, distance, and antenna gains. Calculates EIRP, free-space path loss (ITU-R P.525), received power at the receiver, and link margin relative to an optional receiver sensitivity threshold. Use this to determine whether a wireless link closes with adequate margin. Accepts output from noise_figure_cascade and feeds into snr_margin for full receive-chain analysis.

← from noise_figure_cascade.total_nf_dbfeeds snr_margin →
Transmitter output power in dBm
Carrier frequency in megahertz (MHz)
Link distance in kilometres
Transmit antenna gain in dBi (default 2.15 for a half-wave dipole)
Receive antenna gain in dBi (default 2.15 for a half-wave dipole)
Receiver sensitivity in dBm; when provided, link margin is calculated
Fill in the inputs and Compute to see the structured result.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/link_budget \
  -H "Content-Type: application/json" \
  -d '{"tx_dbm": …, "freq_mhz": …, "dist_km": …}'

MCP: connect to https://calc.engineer/mcp and call link_budget.

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